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Marswatch

1998-1999 Apparition

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Images - 1999 April 21-30
    (All times U. T. - Images not to scale. Click on image for more or larger scale views where available.)



21

1999-04-21 DCP Image of Mars Donald C. Parker, Coral Gables, Florida
Lynxx PC camera 16-in (41cm) f/6 Newtonian, Eyepiece Projection @ f/47.8

Integration Times:
   Blue (BG12 + IR Rejection)     8.75-15.00s
   Green (VG9 + IR Rejection)    4.00-5.50s
   Red (RG610 + IR Rejection)   0.38-0.44s
Images flat and dark corrected.
Seeing fair to poor (4-5) but improved late (7). Transparency 5m initially but deteriorated late due to clouds, haze. Wind NE-ENE 2-10 knots. Slight dew.
Strong (3+) violet clearing southern hemisphere, 2+ in northern -- also noted visually with Wratten-47 filter. Syrtis Blue Cloud. Brilliant clouds over Hellas. Wispy haze over Libya; Elysium cloud brightened with rotation. Hyblaeus Extension broad, dark. Cerberus III noted. Cerberus-Trivium only 2-3 dots.

1999-04-21 FJM Images of MarsFrank J. Melillo

1999-04-21 RDB Drawing of Mars Bob Bunge; E-mail: rbunge@radix.net
4-inch f/10 reflector, 225x.

07:00 UT
Seeing: 9.2 out of 10.

Put the 4-inch reflecter out at 10 p.m. (EDT) and went to bed. Got up at 2:45 a.m. to high, thin clouds, no wind and temps in the upper 30's. Very calm. Thicker clouds appeared to be coming in from the west. Seeing rated a 9.2 out of 10. Of interest was the bright area called Elysium in the northern part of the disk, gently surrounded by dark markings (Stymphalius Lacus). Also clearly seen was Libya, the "inlet" on the side of Syrtis Major, as well as Moeris Lacus, the dark marking the forms the northern side of Libya. Alcyonius Nodus, a dark marking between Elysium and Utopia appeared larger, with more subtle details than shown in the maps published in Sky & Telescope. Also seen were faint dark markings that make up Protonilus, off the tip of Utopia. Mare Tyrrhinum, Mare Cimmerium and the light area between them - Hesperia - were easily seen in the south, wrapping around the Hellas bright area. Several dark and lighter areas on the north side of Tyrrhenum were visible. Also, the edge between Sytris Major and Aeria was mottled, with a good amount of detail seen. The North Polar cap continues to be somewhat difficult to see. All of this with a 4-inch telescope!

1999-04-21 AJC Image of Mars António Cidadão, Oeiras, Portugal
ST-5C camera 10-in (25cm) f/10 Schmidt-Cassegrain

Seeing conditions (7-8/10). Bright clouds over Elysium, Nix Olympica and Tharsis. Cloud over Arcadia.

Possible dust storm (or cloud?) over Mare Boreum (arrowed). This feature was absent on images obtained on April 18 and 19. It is now visible on R, G and B filtered images.


22

1999-04-22 N_F Image of Mars Nelson Falsarella, Sao Jose do Rio Preto, SP, BRAZIL; E-mail: nfalsarella@riopreto.com.br
International Mars Patrol, Rede de Astronomia Observacional, REA-Brazil
AVA ASTROVID 400 CCD Videocamera; 8-in (20cm) f/6.5 Newtonian, Eyepiece Projection with a MEADE Series 3000 Plossl 5mm.

1999-04-22 DCP Image of Mars Donald C. Parker, Coral Gables, Florida
Lynxx PC camera 16-in (41cm) f/6 Newtonian, Eyepiece Projection @ f/47.8

Integration Times:
   Blue (BG12 + IR Rejection)   10.50-11.75s
   Green (VG9 + IR Rejection)    4.50s
   Red (RG610 + IR Rejection)   0.41s
Images flat and dark corrected.
Seeing excellent (8). Transparency 5m initially but deteriorated late due to clouds, haze. Wind ENE-ESE 3-13 knots. No dew.
Strong (3+) violet clearing southern hemisphere, 1+ in northern hemisphere -- also noted visually with Wratten-47 filter. Syrtis Blue Cloud. Brilliant clouds over Hellas. Wispy haze over Libya; Elysium cloud brightened with rotation. Hyblaeus Extension broad, dark. Cerberus III noted. Cerberus-Trivium only 2-3 dots. Bright cloud noted in green and blue and visually with W-47 southeast of NPC over Lemuria.

1999-04-22 RWW Drawing of Mars Richard W. Wilhelm, Manorville, New York.
4.5" (11.4 cm) F/8 Newtonian.

Seeing: 9/10, transparency: 3/6.
A veil of high cirrostratus clouds triggered by an approaching warm front produced excellent seeing conditions. Primary albedo features strong in blue light (W80A), although not to as great an extent as 4/19. Uchronia, Utopia, Casius and Lemuria along with the Hyblaeus Extention highly visible and exhibiting a fine contrast with the surrounding desert regions. Hesperia seen, sharply dividing Mare Tyrrhenum and Mare Cimmerium. Syrtis Major partially obscured by morning haze/clouds, extending to Libya, with W15 filter revealing a partial Syrtis Blue cloud. Cloud over Nix Olympica on evening limb, accenting a substantial evening limb haze. Both morning and evening limb hazes were highly visible in red light. Some brightening seen over Xanthus/Ausonia region. Given the overall excellent visibility all features mentioned, it is interesting to note that I didn't see traces of the Propontis Complex (seen on 3/21 under less than ideal seeing conditions) or the nearby (presumably still existent?) Elysium cloud. In the latter case, small aperture may be the limiting factor. I'm looking forward to seeing what my fellow observers saw in this regard.

1999-04-22 M_DiS Image of MarsMaurizio Di Sciullo, Coconut Creek, Florida; E-mail: NimbusSky@worldnet.att.net
Starlight Xpress HX-516 CCD camera; 10" (25 cm) Excelsior Optics E-258 f/8 Newtonian, Eyepiece Projection @ f/47

Integration Times:
   400 - 510 nm:   0.19s
   490 - 590 nm:   0.15s
   610 - 720 nm:   0.22s
All images acquired with 700 - 1200+ nm block filter inline with eyepiece projection unit, True Technologies Dichroic Filters + IR block
No dark frame, flat fielding or bias correction applied. Camera operated in "Binned" (low-res) mode. All images are single frames, no co-addition or averaging performed, except for composite color image.

Seeing: Very poor; 2/10. Wind: calm, low humidity (~ 70%).
416 frames acquired, 3 of marginal value.

Seeing almost too poor to conduct credible observation. Haze over Hellas noted, along with limb haze over Syrtis Major, and to a lesser degree over Mare Cimmerum. White cloud noted over Elysium Mons. 400 - 510 nm and 490 - 590 nm bands showing bright feature on perimeter of North Polar Hood (NPH) at approximately 150° longitude, 83° latitude at perimeter of Olympia Planitia. Suspect frost, as observations made on 3 April, 1999, during periods of excellent seeing show same marking at stated location.

1999-04-22 BCC Image of Mars Stefan Buda & Bratislav Curcic, Melbourne, Australia (5km from the city centre).
Homemade CB211 clone CCD with a mechanical shutter; 10-in. (25.4 cm) f/16 Dall-Kirkham (homemade) + 3X Barlow (effective f/50). No filters.

Seeing average to good (~7), transparency average (mag 4).


23

1999-04-23 MLS Image of Mars Mark Schmidt, Racine, Wisconsin; 88.02861° W 44.72889° N; E-mail: rasastro@wi.net
ST-5C CCD camera; 14-in (36cm) f/10 Schmidt-Cassegrain, Projection at f/31.

 Ls: 128.7°; De: 18.1°; Diameter: 16.0” 04:32 U.T.; CM: 206.48°; Integration time: 0.15s
Seeing: #2 1/2; Transparency: 2 1/2 - 3 1/2 mag.

Filters: 23A and IR Rejection Filter, Murnaghan Instruments Filters. Processing: CCDSoft-Image Processing Software; Skypro-Image Processing Software

1999-04-23 DF Image of Mars Denis Fell, New Sweden, Alberta, Canada (113.16°W, 52.55°N), email:dfell@telusplanet.net
Astrovid 1000 CCD camera, 8-in (20cm) f/10 SCT, Negative projection f/30, Wratten #21 orange filter. Processed with Snappy and Micrografx Photomagic.

04:30-05:00 UT, CM: 215°-222°.
Seeing Antoniadi III-IV, Martian diameter 15.99", De: 18.26, Phase .999

Darkest feature Mare Cimmerium and M. Tyrrhenum. Bright areas noticed over Memnonia and by Syrtis Major on the limb. North is up.


24

1999-04-24 AJC Image of Mars António Cidadão, Oeiras, Portugal
ST-5C camera 10-in (25cm) f/10 Schmidt-Cassegrain

The images obtained on the night 24-25 show plenty of detail, mostly the red filtered ones. For instance, a bright "ring-like" feature is located at the site of Nix Olympica (almost at CM in the 0:07 UT frame) . This and other details rotate along with the planet.

Propontis Complex is seen near the eastern limb and Solis Lacus at the western limb. Clouds are seen over NixOlympica, Arcadia, Tharsis and Ganges. Haze near the South Pole region? Ice (+ cloud?) near the North polar cap (apparently over Lemuria) remains visible.

I'm ready, and so is my 'scope and CCD camera, but rain has ruled these last few days :-(.

1999-04-24 N_F Image of Mars Nelson Falsarella, Sao Jose do Rio Preto, SP, BRAZIL; E-mail: nfalsarella@riopreto.com.br
International Mars Patrol, Rede de Astronomia Observacional, REA-Brazil
AVA ASTROVID 400 CCD Videocamera; 8-in (20cm) f/6.5 Newtonian, Eyepiece Projection with a MEADE Series 3000 Plossl 5mm.

1999-04-24 DCP Image of Mars Donald C. Parker, Coral Gables, Florida
1999-04-24 DCP Image of Mars Donald C. Parker, Coral Gables, Florida
Lynxx PC camera 16-in (41cm) f/6 Newtonian, Eyepiece Projection @ f/47.8

Integration Times:
   Blue (BG12 + IR Rejection)   8.25-8.75s
   Green (VG9 + IR Rejection)  3.38-4.00s
   Red (RG610 + IR Rejection) 0.34-0.45s
   Infrared (750-825 nm)           5.00s
Images flat and dark corrected.
Seeing excellent (8-9). Transparency 5m. Wind ENE-ESE 4-9 knots. No dew.
Strong (3+) violet clearing -- also noted visually with Wratten-47 filter. Syrtis Blue Cloud. Wispy haze over Libya and Amazonis; Elysium cloud brightened with rotation. Hyblaeus Extension broad, dark. Cerberus III noted. Cerberus-Trivium only 2 dots. Bright cloud noted in green and blue south of NPC over Lemuria -- Lemuria also bright but smaller in red.

1999-04-24 DMT Drawing of Mars Daniel M. Troiani, ALPO Mars Section Head, Chicago, Illinois, E-mail: dantroiani@earthlink.net
17 1/2" f/4.8 Newtonian, 478x. UT

03:38-03:49; CM: 193°;  Ls: 128°; De: 18°
Filters: W#80a, W#47, W#25
Seeing: 7/10;  Transparency: 6/6
Blue Clearing (0-3): 3

Clouds over SPR with both limbs very bright. Slightly bright cloud in Elysium.

1999-04-24 DF Image of Mars Denis Fell, New Sweden, Alberta, Canada (113.16°W, 52.55°N), email:dfell@telusplanet.net
Astrovid 1000 CCD camera, 8-in (20cm) f/10 SCT, Negative projection f/30, Wratten #21 orange filter. Processed with Snappy and Micrografx Photomagic.

04:50-05:00 UT, CM: 212°.
Seeing Antoniadi IV, Martian diameter 16.00", De: 18.41, Phase 1.00

Darkest feature Mare Cimmerium and M. Tyrrhenum. North is up.

1999-04-24 CEH Drawing of Mars Carlos E. Hernandez (A.L.P.O. Mars Section)
8-inch (20-cm) f/7.5 Newtonian reflector at 305x and Wratten 23A, and 38A filters.

04:50 UT (CM: 211.0°, Filter: Wratten 23A (red), left)
06:00 UT (CM: 228.1°, Filter: Wratten: 38A (blue), right)
Ls: 128.8°, De: 18.1°; Dia: 16.0".

1999-04-24 M_DiS Image of MarsMaurizio Di Sciullo, Coconut Creek, Florida; E-mail: NimbusSky@worldnet.att.net
Starlight Xpress HX-516 CCD camera; 10" (25 cm) Excelsior Optics E-258 f/8 Newtonian, Eyepiece Projection @ f/47

Integration Times:
   400 - 510 nm:   0.18s
   490 - 590 nm:   0.15s
   610 - 720 nm:   0.20s
   Full Band   0.07s
All images acquired with 700 - 1200+ nm block filter inline with eyepiece projection unit, True Technologies Dichroic Filters + IR block
No dark frame, flat fielding or bias correction applied. Camera operated in "Binned" (low-res) mode. All images are single frames, no co-addition or averaging performed, except for composite color image.

Seeing: Mediocre; 4-5/10. Wind; calm, high humidity (~ 95%).
Mediocre, but consistent seeing allowed 2 sets of images to be acquired, approximately 35 minutes apart.

First set taken about 05:14 - 05:19 UTC shows Syrtis Major very close to limb, showing blue Syrtis cloud to particular advantage. Cloud is viewed from a line of sight nearly tangential to the planet's surface at that point. Compare to second set taken after 8 degrees of rotation, which shows haze, but does not show the cloud's striking blue color as well. Evening side of planet shows Olympus Mons also nearly on the limb, showing bright clouds surrounding the volcano. Slight atmospheric bulging also observed at mentioned location. Elysium Mons showing usual plume of bright white clouds, though not as contrasted against planet as Olympus Mons. This feature was also observed on 20 March, 1999, and has not changed perceptibly since. Cerberus showing as light albedo feature in 610 - 720 nm band, as well as in RGB frame, both in second image set. Very light haze showing in 400 - 510 nm frames over Ausonia, Xanthus, Thyle II areas.

Possible frost or arctic cloud observed on 22 April 1999, at high northern latitudes, again observed at similar location (appx 83 north latitude, 150 longitude).

1999-04-24 RTZ Images of Mars Ron Zachary, Rochester Hills, Michigan, (83.05° W, 42.38° N), E-mail: rzachary@compuserve.com
Starlight Xpress MX5c; 14-inch (35 cm) f/11 Schmidt-Cassegrain telescope; Positive Projection at f/44. Color separations performed using MaxIm DL software.

07:49:01 U.T.; CM: 254°; Integration time: 0.07s
Seeing: 6-8/10; Transparency: 5/6.

1999 Apr 24 Mars David Klassen, Jim Bell, and Bill Golisch, NASA Infrared Telescope Facility, Mauna Kea, Hawaii
3.0-meter; 11:00 UT
Click on image for additional views from this observing run.

These images were taken at the NASA IRTF using the NSFCAM. Mars was imaged through the circular variable filter (CVF) at several infrared wavelengths (wavelength in micrometers listed below each image). The observations were made at about 11:00 UT by David Klassen, Jim Bell and Bill Golisch. The images have gone through preliminary processing but have yet to be absolutely calibrated.

1999 Apr 24 Mars David Klassen, Jim Bell, and Bill Golisch, NASA Infrared Telescope Facility, Mauna Kea, Hawaii
3.0-meter; 11:20 UT
Click on image for additional views from this observing run.

These images were taken at the NASA IRTF using the NSFCAM. Mars was imaged through the circular variable filter (CVF) at several infrared wavelengths (wavelength in micrometers listed below each image). The observations were made at about 11:20 UT by David Klassen, Jim Bell and Bill Golisch. The images have gone through preliminary processing but have yet to be absolutely calibrated.

1999-04-24 BCC Image of Mars Stefan Buda & Bratislav Curcic, Melbourne, Australia (5km from the city centre).
Homemade CB211 clone CCD with a mechanical shutter; 10-in. (25.4 cm) f/16 Dall-Kirkham (homemade) + 3X Barlow (effective f/50). No filters.

Seeing average (~6/10), transparency good (mag 4.5).

The interesting thing on this image pair is an apparent dark line through the Hellas region. I don't think it's an artifact as it is visible on both images (and has different aspect angle, following planet's rotation). I couldn't find such marking on any of the maps or high resolution images.

1999-04-24 S_M Image of Mars Steve Massey, Siding Springs, Australia; 149.05° E, 31.27° S; E-mail: smassey@ozemail.com.au
Astrovid 2000 CCD camera; 24-inch (61 cm) f/36 Cassegrain telescope at MSSSO.

17:10 U.T.

1999-04-24 VGT Image of Mars Victor G. Tejfel, Laboratory of Lunar and Planetary Physics, Fessenkov Astrophysical Institute, Alma-Ata, Kazakhstan; E-mail: tejf@hotmail.com
ST-6V CCD camera; 24-in (60 cm) Cassegrain.

1999-04-24 AJC Image of Mars António Cidadão, Oeiras, Portugal
ST-5C camera 10-in (25cm) f/10 Schmidt-Cassegrain

See commentary above.


25

1999-04-25 J_P Images of Mars J. Porto, Azores

1999-04-25 E_R Image of Mars Eric Roel, Mexico; E-mail: bucero@df1.telmex.netmx
Starlight Xpress interline ccd camera; 10" f/20 TEC Maksutov telescope; Negative Projection.

CM.240°. A dichroic filter with a passband of 610-720 nm.was used with an integration of .0188 second.

Images show rather clearly Mare Cimmerium; Moetis Lacus; Alcyonius Nodus; Stymphallus Lacus Propoutis and Protonilus.

1999-04-25 RDB Drawing of Mars Bob Bunge; E-mail: rbunge@radix.net
20-inch f/6.4 reflector, 200x and 270x.

04:45 U.T.

At 12:45, took a look to find very good seeing. Many very, very faint "dark" markings. In fact, more dark than light areas, if the very faint areas are taken into account. The faintness and softness of the detail reminded me more of drawing a 14th mag galaxy than Mars! North Polar cap harder than ever to see - very small. The larger section of Utopia just coming into view, as was the Elysium bright area and it's surrounding dark markings. In moments of good seeing, a small very dark, almost round spot appeared - apparently the very small Propoutis feature. Very faint, large dark areas around Propoutis aren't charted. Gotta wonder if a storm has stirred things up here. A bright area on the trailing (setting) edge looked like clouds - perhaps the clouds over Nix Olympica. Nice detail seen in Mare Cimmerium, including two dark, northward extensions.

1999-04-25 FJM Images of MarsFrank J. Melillo

1999-04-25 RWW Drawing of Mars Richard W. Wilhelm, Manorville, New York.
4.5" (11.4 cm) F/8 Newtonian.

Seeing: 7/10, transparency: 5/6.
Extensive morning and evening limb haze, accompanied by locally brighter clouds over Libya (extremely bright), Meroe Insula and Nix Olympica. Haze observed over Ausonia, prominent in green light. Elysium cloud seen (surprisingly to best advantage without filters), subtle but unmistakable. NPC bright, but not as distinct as in past observations due to what appears to be a overall brightening in the North Polar region. Hyblaeus Extension visible, along with the Propontis/Trivium Charontis group. Inability to discern the latter during my 4-22 observation probably due to reduced contrast (critical with small apertures) resulting from local afternoon clouds or haze.

1999-04-25 VGT Image of Mars Victor G. Tejfel, Laboratory of Lunar and Planetary Physics, Fessenkov Astrophysical Institute, Alma-Ata, Kazakhstan; E-mail: tejf@hotmail.com
ST-6V CCD camera; 24-in (60 cm) Cassegrain.

1999-04-25 J_P Images of Mars J. Porto, Azores


26

1999-04-26 N_F Image of Mars Nelson Falsarella, Sao Jose do Rio Preto, SP, BRAZIL; E-mail: nfalsarella@riopreto.com.br
International Mars Patrol, Rede de Astronomia Observacional, REA-Brazil
AVA ASTROVID 400 CCD Videocamera; 8-in (20cm) f/6.5 Newtonian, Eyepiece Projection with a MEADE Series 3000 Plossl 5mm.

1999-04-26 DMT Drawing of Mars Daniel M. Troiani, ALPO Mars Section Head, Chicago, Illinois, E-mail: dantroiani@earthlink.net
17 1/2" f/4.8 Newtonian, 478x. UT

03:10-03:22
Filters: W#80a, W#47, W#25
Seeing: 4.5/10;  Transparency: 5/6
Blue Clearing (0-3): 2.5

Clouds over Tharsis region, Slight ECB visible, Solis Lacus was dark.

1999-04-26 MLS Image of Mars Mark Schmidt, Racine, Wisconsin; 88.02861° W 44.72889° N; E-mail: rasastro@wi.net
ST-5C CCD camera; 14-in (36cm) f/10 Schmidt-Cassegrain, Projection at f/31.

 Ls: 129.7°; De: 18.4°; Diameter: 16.1”
Seeing: #4 - #5/10; Transparency: 2-1/2 mag.
04:32 U.T. (left);  CM: 193.6°;   Integration time: 0.18s   23A & IR Rejection Filter
05:07 U.T. (right);  CM: 197.51°;   Integration time: 0.45s   Near IR 800 - 1100nm, IR Passing/Visible Rejection

Notes: Slight haze
Murnaghan Instruments Filters. Processing: CCDSoft-Image Processing Software; Skypro-Image Processing Software

1999-04-26 J_P Images of Mars Ramiro Hernandez, Saltillo, Mexico
Sony Handycam and Snappy frame grabber; 8-inch (20 cm) f/10 Scmidt-Cassegrain Meade

6:00 to 7:10 UT

1999-04-26 RTZ Images of Mars Ron Zachary, Rochester Hills, Michigan, (83.05° W, 42.38° N), E-mail: rzachary@compuserve.com
Starlight Xpress MX5c; 14-inch (35 cm) f/11 Schmidt-Cassegrain telescope; Positive Projection at f/44. Color separations performed using MaxIm DL software.

07:03:47 U.T.; CM: 226°; Integration time: 0.09s
Seeing: 5-7/10; Transparency: 5/6.

1999-04-26 TA Image of Mars 1999-04-26 TA Image of Mars
1999-04-26 TA Image of Mars
Tomio Akutsu, Japan; E-mail: is6t-akt@asahi-net.or.jp

32cm F/6.5 Reflector Telers2 KAF0400E CCD

1999-04-26 VGT Image of Mars Victor G. Tejfel, Laboratory of Lunar and Planetary Physics, Fessenkov Astrophysical Institute, Alma-Ata, Kazakhstan; E-mail: tejf@hotmail.com
ST-6V CCD camera; 24-in (60 cm) Cassegrain.

1999-04-26 J_P Images of Mars J. Porto, Azores


27

1999-04-27 N_F Image of Mars Nelson Falsarella, Sao Jose do Rio Preto, SP, BRAZIL; E-mail: nfalsarella@riopreto.com.br
International Mars Patrol, Rede de Astronomia Observacional, REA-Brazil
AVA ASTROVID 400 CCD Videocamera; 8-in (20cm) f/6.5 Newtonian, Eyepiece Projection with a MEADE Series 3000 Plossl 5mm.

1999-04-27 DCP Image of Mars Donald C. Parker, Coral Gables, Florida
Lynxx PC camera, 16-in (41cm) f/6 Newtonian, Eyepiece Projection @ f/47.8

Integration Times:
   Blue (BG12 + IR Rejection)     8.25-9.50s
   Green (VG9 + IR Rejection)    3.63s
   Red (RG610 + IR Rejection)   0.34s
Images flat and dark corrected.
Seeing fair (7-->5). Transparency 5m with occ clouds. Wind SE 4-9 knots, gusty. No dew.
Strong (2-3+) violet clearing. Orographics bright near pm limb. Olympus bright only after local 2pm. Elysium cloud, however, bright on am limb. Wispy clouds over Amazonis. Cerberus-Trivium only 2 dots. Dusky streak along northern borders of Sirenum and Cimmerium M. noted as in previous apparitions. Bright cloud noted in green and blue south of NPC over Lemuria -- Lemuria also bright but smaller in red.

1999-04-27 DMT Drawing of Mars Daniel M. Troiani, ALPO Mars Section Head, Chicago, Illinois, E-mail: dantroiani@earthlink.net
17 1/2" f/4.8 Newtonian, 478x. UT

05:40-05:58; CM: 197°;  Ls: 130.5°.
Filters: W#80a, W#47, W#25
Seeing: 5/10;  Transparency: 6/6
Blue Clearing (0-3): 2

Very bright cloubs over Southern Polar Region. Elysium slightly bright with bright following limb clouds.

1999-04-27 DMM Image of Mars David M. Moore, Pheonix, Arizona;
E-mail: davidpaulamoore@email.msn.com

1999-04-27 J_P Images of Mars J. Porto, Azores


28

1999-04-28 HEA Image of Mars Hernan Acosta, Valencia, Venezuela (10° 11.0' N, 68° 00.0' W)
4.5-inch Newtonian, 9mm Kellner, 2x Barlow
03:41 UT; CM 158°

1999-04-28 FJM Images of MarsFrank J. Melillo

1999-04-28 RWW Drawing of Mars Richard W. Wilhelm, Manorville, New York.
4.5" (11.4 cm) F/8 Newtonian.

Seeing: 7/10, transparency: 5/6.
Strikingly brilliant morning and evening limb haze/clouds were the highlight of this evening's observation, with the Tharsis region exhibiting particular brilliance. Southern regions of Eridania and Electris region were bright. Propoutis Complex along with the Trivium Charontis group was readily visible. The Aeolis, Zephyria and Mnemonia regions north of Mare Sirenum appeared somewhat brighter than the surrounding desert area. North polar cap was bright and distinct, exhibiting a dark surrounding rim.

1999-04-28 N_F Image of Mars Nelson Falsarella, Sao Jose do Rio Preto, SP, BRAZIL; E-mail: nfalsarella@riopreto.com.br
International Mars Patrol, Rede de Astronomia Observacional, REA-Brazil
AVA ASTROVID 400 CCD Videocamera; 8-in (20cm) f/6.5 Newtonian, Eyepiece Projection with a MEADE Series 3000 Plossl 5mm.

1999-04-28 AJC Image of Mars António Cidadão, Oeiras, Portugal
ST-5C camera 10-in (25cm) f/10 Schmidt-Cassegrain

A hint of Rima Tenuis is seen in a red image (arrowed). Solis Lacus prominent, as well as the albedo marking that corresponds to the Vallis Marineris region. Clouds are seen over Amazonis, Arcadia, Nix Olympica, Tempe, Baltia, Syria, Mare Erythraeum, Cryse and Niliacus Lacus. Haze near the South Pole region? Ice (+ cloud?) near the North polar cap remains visible.


29

1999-04-29 N_F Image of Mars Nelson Falsarella, Sao Jose do Rio Preto, SP, BRAZIL; E-mail: nfalsarella@riopreto.com.br
International Mars Patrol, Rede de Astronomia Observacional, REA-Brazil
AVA ASTROVID 400 CCD Videocamera; 8-in (20cm) f/6.5 Newtonian, Eyepiece Projection with a MEADE Series 3000 Plossl 5mm.

1999-04-27 DMT Drawing of Mars Daniel M. Troiani, ALPO Mars Section Head, Chicago, Illinois, E-mail: dantroiani@earthlink.net
17 1/2" f/4.8 Newtonian, 478x. UT

02:48-02:58.
Filters: W#47
Blue Clearing (0-3): 2

Very large bright cloub on preceding limb.

1999-04-29 DCP Image of Mars Donald C. Parker, Coral Gables, Florida
Lynxx PC camera, 16-in (41cm) f/6 Newtonian, Eyepiece Projection @ f/47.8

Integration Times:
   Blue (BG12 + IR Rejection)     8.75s
   Green (VG9 + IR Rejection)    3.63s
   Red (RG610 + IR Rejection)   0.34s
Images flat and dark corrected.
Seeing fair (4-6). Transparency 5m. No wind. Moderate dew.
Tharsis orographics bright with wispy "tails" trailing to the northwest. Elysium cloud conspicuous on am limb. Wispy clouds over Amazonis. Cerberus-Trivium only 2 dots. Dusky streak along northern borders of Sirenum and Cimmerium M. noted as in previous apparitions. Bright cloud in green and blue southwest of NPC over Lemuria -- Lemuria also bright but smaller in red.

1999-04-29 BAC Image of Mars Brian Colville, Maple Ridge Observatory, Cambray, ON Canada (79.15W, 44.28N), email:maple@quicklinks.on.ca
Pixcel 237 CCD Camera, Med Resolution - 2x2 binning, 14.8u 12-in (30cm) f/10 SCT at efr: f/40.

04:17 UT; Integration time: 0.10 sec.; Calibration: Dark, Flat; Processing: Unsharp Mask via MaximCCD.
Seeing: good, 7/10, Martian diameter 16.17", CM: 159°, Phase: .9988
Filters: IR Passing 830nm, 100nm FWHM.

1999-04-29 RAH Images of Mars Rudolf A. Hillebrecht, Bad Gandersheim, Germany
SBIG ST-5 camera, SBIG filterwheel; 7-inch f/9 Starfire Refractor, Eypiece Projection @ f/50

21:36 UT (CM: 53°, left)
22:18 UT (CM: 63°, center left)
22:43 UT (CM: 70°, center right)
23:25 UT (CM: 80°, right)

Integration Times:
   Blue (+ IR Rejection)   0.85 s
   Green (+ IR Rejection) 0.25 s
   Red (+ IR Rejection)    0.10 s
Images are flat corrected.

Seeing rather good (7/10). All RGB images are result of adding several images of each color. Processing with MaxEnt in MaximDL.
These images belong to the best resolved of Mars I have ever done. Cloudiness over Tharsis and Arcadia. Note its development during the two hours between first and last image. Limb clouds over the Ismenius Lacus area. Small and sharp North Polar Cap remnant. Voilet clearing evident.

1999-04-29 DAP Image of Mars Damian Peach, United Kingdom


30

1999-04-30 DAP Image of Mars Damian Peach, United Kingdom

1999-04-30 DCP Image of Mars Donald C. Parker, Coral Gables, Florida
Lynxx PC camera, 16-in (41cm) f/6 Newtonian, Eyepiece Projection @ f/47.8

Integration Times:
   Blue (BG12 + IR Rejection)     8.50s
   Green (VG9 + IR Rejection)    3.50s
   Red (RG610 + IR Rejection)   0.34s
Images flat and dark corrected.
Seeing fair (5-6). Transparency 5m. Wind w 0-2 knots. Moderate dew.
Tharsis orographics bright. Elysium cloud bright on morning limb. Wispy clouds over Amazonis. Cloud over Cebrenia on northwest limb. Dusky streak along northern borders of Sirenum M. and Cimmerium M. again noted. Bright cloud in green and blue southwest of NPC over Lemuria.

1999-04-30 RDB Drawing of Mars Bob Bunge; E-mail: rbunge@radix.net
20-inch f/6.4 reflector, 270x.

05:15 UT
Seeing: 6 out of 10.

High clouds in sky, but the moon was only two degrees or so from Mars. I suspect that glare from the Moon was reducing the contrast and impaired seeing much in the way of dark markings. However, the cloud near Nix Olympica appeared larger and brighter, with a short "tail" coming off, perhaps wind blown clouds.

1999-04-30 RTZ Images of Mars Ron Zachary, Rochester Hills, Michigan, (83.05° W, 42.38° N), E-mail: rzachary@compuserve.com
Starlight Xpress MX5c; 14-inch (35 cm) f/11 Schmidt-Cassegrain telescope; Positive Projection at f/44. Color separations performed using MaxIm DL software.

07:50:44 U.T.; CM: 201°; Integration time: 0.15s
Seeing: 6-8/10; Transparency: 4/6.

1999-04-30 T_A Image of Mars 1999-04-30 T_A Image of Mars
1999-04-30 T_A Image of Mars
Tomio Akutsu, Japan; E-mail: is6t-akt@asahi-net.or.jp

32cm F/6.5 Reflector Telers2 KAF0400E CCD

1999-04-30 VGT Image of Mars Victor G. Tejfel, Laboratory of Lunar and Planetary Physics, Fessenkov Astrophysical Institute, Alma-Ata, Kazakhstan; E-mail: tejf@hotmail.com
ST-6V CCD camera; 24-in (60 cm) Cassegrain.

1999-04-30 J_P Images of Mars J. Porto, Azores

1999-04-28 M_E Image of Mars Marco Eckstein, Roedental, Germany, E-mail: starlight@coburg.baynet.de
Hitachi Hi8 Videocamera; 8-inch (20 cm) Schmidt-Cass. (LX-10); Eyepiece Projection with a 10mm Plossl (200x).
23:40 UT; CM 70°

Seeing: bad conditions (~3)
Albedo features not very clearly - possible dust storm in western Mare Acidalium - clouds east of Acidalium - very small polar cap


Martian Cyclone

Martian Cyclone-VGT Victor G. Tejfel, Laboratory of Lunar and Planetary Physics, Fessenkov Astrophysical Institute, Alma-Ata, Kazakhstan; E-mail: tejf@hotmail.com
ST-6V CCD camera; 24-in (60 cm) Cassegrain.



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This page is maintained by David Knighton for the International MarsWatch. The 1998-1999 MarsWatch site it hosted by the Astronomical League as a service to the astronomical community. Comments, corrections, and suggestions can be addressed to webmaster@astroleague.org. This page last updated October 7, 1999.