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Marswatch

1998-1999 Apparition

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Images - 1999 May 21-31
    (All times U. T. - Images not to scale. Click on image for more or larger scale views where available.)



21

1999-05-21 FJM Images of Mars Frank J. Melillo, Holtsville, New York, FrankJ12@aol.com

1999-05-21 BH Drawing of Mars Brad Hoehne,  Columbus, Ohio, E-mail: HoehneB@chi.osu.edu
8" (20 cm) f/6.75 Newtonian, 5 mm LV, 275x. W 25 Red filter.

03:15 UT

This is an image of Mars drawn through my telescope from my backyard in urban Columbus, Ohio. Seeing was average. I am experimenting with a new drawing technique on grey paper to better render apparent haze and cloud brightness. Overall dearth of limb haze tonight. Hellas quite bright. There was a small bright patch near the north polar cap. Syrtis Major appeared blue-brown tonight, and its albedo was very even across the feature. I think the terminator was slightly less advanced toward CM than is suggested here in the drawing.

1999-05-21 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/48). No filters.

Seeing: average (6), Transparency: average (mag 4).
The weather has been rather hopeless in Melbourne lately.


22

1999-05-22 DMT Drawing of Mars Daniel M. Troiani, ALPO Mars Section Coordinator, Chicago, Illinois, E-mail: dantroiani@earthlink.net
18" f/6 Newtonian, 485x.

02:30-02:41; CM: 282°; De: 22.14°
Filters: W#80a, W#47
Seeing: 4.5/10;  Transparency: 5/6
Blue Clearing (0-3): 1

1999-05-22 RHB Images of Mars Ramiro Hernandez, Saltillo, Mexico, E-mail: rhernand@campus.sal.itesm.mx
Sony Handycam camcorder and Snappy frame grabber; 8-inch (20 cm) f/10 Schmidt-Cassegrain Meade

05:41 UT, CM: 327°.

1999-05-22 T_A Image of Mars 1999-05-22 T_A Image of Mars
1999-05-22 T_A Image of Mars Tomio Akutsu, Japan; E-mail: is6t-akt@asahi-net.or.jp
32cm F/6.5 Reflector Telers2 KAF0400E CCD


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1999-05-23 RHB Images of Mars Ramiro Hernandez, Saltillo, Mexico, E-mail: rhernand@campus.sal.itesm.mx
Sony Handycam camcorder and Snappy frame grabber; 8-inch (20 cm) f/10 Schmidt-Cassegrain Meade

02:41 UT (left), CM=275, 03:25 UT (right), CM=284

1999-05-23 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:   0.22s
   490 - 590 nm:   0.18s
   610 - 720 nm:   0.24s
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: Good; 7/10. Wind: Calm, low humidity (~ 60%).

Faint Equatorial Cloud Band (ECB) stretching from limb to limb; blue Syrtis cloud much less pronounced than on 11 April 1999. Significant fog observed over Terra Tyrrhena, just north of Hellas. No immediately identifiable dust activity. Usual cloud cover over Elysium Mons.

1999-05-23 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)    16.38-17.55s
   Green (VG9 + IR Rejection)    5.85-7.00s
   Red (RG610 + IR Rejection)   0.49s
Images flat and dark corrected.
Seeing fair (6-7). Transparency 0-4.0m, variable with frequent clouds. Gusty Wind NE-ENE 5-12 knots.
Slight violet clearing (1+) in south. Light clouds over Aeria, Arabia, and Eden. Heavy cloud over Libya. Hellas dull in red but bright cloud in green and blue. Hyblaeus dark and Elysium bright on evening limb.

1999-05-23 RWW Drawing of Mars Richard W. Wilhelm, Manorville, New York.
8" (20.3 cm) f/6 Newtonian.

Seeing: 8.5/10, transparency: 3/6.

Syrtis Major prominent on the CM. Extremely bright evening cloud over Aethiopis extending to eastern Libya. Hellas bright. Notable absence of haze or clouds on morning (following) limb. Cloud observed over Aeria and Moab. NPC bright with sharply defined dark-collar perimeter. Albedo features strong in blue light. Nodus Alcyonius and the Boreosyrtis/Protonilus/Ismenius Lacus grouping were visible during moments of best seeing.

One of the best observing sessions so far for this apparition. High cirrostratus clouds along with general hazy conditions frequently veiled the planet, but the seeing was superb.

1999-05-23 DMM Image of Mars David M. Moore, Phoenix, Arizona;
E-mail: davidpaulamoore@email.msn.com

1999-05-23 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).
19:55 UT; CM 180°

Seeing: normal (5-6)
Not very bright cloud over Elysium - small polar cap - no dust activity - clouds over Tharsis - no really dark albedo features in this region

1999-05-23 JJZ Images of Mars Jure Atanackov, Velenje, Slovenia, E-mail: excel@siol.net
8-inch (20 cm) LX50 f/10 SCT, Magnification: 125x, 500x, Filters: green

20:45 UT, CM: 188°.
Seeing: 5 (1-10); Transaprency: 6 (1-6)

Seeing was fair, nothing spectacular. Msirenum Mare and Cimmerium Mare were prominent as was the haze above. Mesogaea and Amazonis were bright. Bright evening limb clouds. Cloud over Olympus Mons suspected but not definetly seen. Polar cap very bright. Polar hood??


24

1999-05-24 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)    17.29s
   Green (VG9 + IR Rejection)    5.85s
   Red (RG610 + IR Rejection)   0.47s
Images flat and dark corrected.
Seeing poor (4). Transparency poor (4.0m) with haze. Wind ENE 4-8 knots.
Slight violet clearing (1+) in south. Heavy clouds over Libya, Aeria, and N. Syrtis Major. Hellas dull in red but bright cloud in green and blue. Hyblaeus broad, dark. Elysium cloud bright. Cloud east of North Polar Cap (NPC) over Lemuria.

1999-05-24 RHB Images of Mars Ramiro Hernandez, Saltillo, Mexico, E-mail: rhernand@campus.sal.itesm.mx
Sony Handycam camcorder and Snappy frame grabber; 8-inch (20 cm) f/10 Schmidt-Cassegrain Meade

03:10 UT, CM: 273°.

1999-05-24 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:   0.22s
   490 - 590 nm:   0.18s
   610 - 720 nm:   0.24s
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: Moderate - Good; 6-7/10. Wind: 3-9 knots from west, Mild humidity (~ 70%).

Equatorial Cloud Band (ECB) observed on 23 May relatively unchanged. Significant fog observed over Terra Tyrrhena, just north of Hellas. New item of interest in 400 - 510 nm band located at extreme north end of morning limb. Approximate coordinates are 60° north latitude, 30° longitude. Feature was last imaged at 03:16 UTC, as computer failure occured shortly thereafter. Continued visual observation for the next one hour confirmed that this feature is not a digital artifact, and is at approximately the same location as the cyclone documented by the HST. No immediately identifiable dust activity. Usual cloud cover over Elysium Mons.

1999-05-24 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, SuperFix and Micrografx Photomagic.

05:30 UT, CM: 316°.
Martian diameter 15.04", Ls: 143.4°; De: 22.23, Phase 0.959

Seeing: Antoniadi II.
Darkest feature of course, Syrtis Major, sharp dark mottling in Utopia Hellas bright and featureless. Sabeus Sinus indistinct due to seeing. North is up.

1999-05-24 FS Image of Mars Friedrich Sussmann, St. Radegund, Austria, (15.50 E, 47.15 N), E-mail: friedrich.sussmann@iic.wifi.at
OES-LCCD11 Camera (KAF 400 Chip); 12-inch (300mm) f/7 Homemade Newtonian; Positive Projection with Sonnar Projectiv 20mm. EFL:14000mm. Composite of 4 - 8 frames.

Integration times:
  Red Image:    0.25s
  Green Image: 0.50s
  Blue Image:   3.00s

21:14-21:18 UT; RGB and IR stop Filter.
Seeing: 5/10

1999-05-24 JFM Images of Mars Jean-François Mourron, Toulouse, France, E-mail: j.f.mourron@wanadoo.fr
6" (15 cm) f/10 Intes-Micro M603 Maksutov and a Philips color video CCD camera.

22:00 UT, CM: 226°.

1999-05-24 AJC Image of Mars António Cidadão, Oeiras, Portugal
ST-5C camera; 10-in (25cm) f/10 Schmidt-Cassegrain
Camera operated in low-res mode (2x binning, that is 20 micrometer square "super"-pixels).

Seeing conditions: 3/10.

Clouds over Libya, Utopia, Elysium. South polar hood? Cerberus visible (darker and broader?). Hyblaeus Extension and Propontis Complex quite evident .


25

1999-05-25 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)    14.24s
   Green (VG9 + IR Rejection)    4.68s
   Red (RG610 + IR Rejection)   0.43s
Images flat and dark corrected.
Seeing fair, variable (5-6). Transparency 4.5m. Wind W 1-4 knots.
Slight violet clearing (1+) in south. Heavy clouds over Libya, Aeria. and eastern Syrtis Major. Blue Syrtis cloud. Hellas dull in red but bright cloud in green and blue. Hyblaeus broad, dark. Elysium cloud bright. Cerberus-Trivium still only two dots, but Cerberus III prominent. Cloud east of North Polar Cap (NPC) over Lemuria.

1999-05-25 AJC Image of Mars António Cidadão, Oeiras, Portugal
ST-5C camera; 10-in (25cm) f/10 Schmidt-Cassegrain
Camera operated in low-res mode (2x binning, that is 20 micrometer square "super"-pixels).

Seeing conditions: 3/10.

Clouds over Elysium, Aethiopis Utopia, Panchaia, Arcadia, Tharsis. South polar hood? Cloud or frost over Lemuria region, near North Polar cap region (Olympia?). Cerberus visible (darker and broader?). Hyblaeus Extension and Propontis Complex quite evident.


26

1999-05-26 BH Drawing of Mars Brad Hoehne,  Columbus, Ohio, E-mail: HoehneB@chi.osu.edu
8" (20 cm) f/6.75 Newtonian

03:20 UT

The seing was very poor tonight. This observation was made between clouds. Turbulent atmosphere made light markings blend together. A great deal of morning haze visble. Below Syrtis major was prominent albedo feature. Hellas brighter than north polar cap.

1999-05-26 FJM Images of Mars Frank J. Melillo, Holtsville, New York, FrankJ12@aol.com

1999-05-26 DMM Image of Mars David M. Moore, Phoenix, Arizona;
E-mail: davidpaulamoore@email.msn.com

1999-05-26 GLS Image of Mars Gerald Stelmack, Winnipeg, Manitoba, Canada; E-mail: gstelmac@cc.umanitoba.ca
Canon 8 mm video recorder (Afocal; 5-inch (18 cm) f/8 Newtonian, Projection: 2x Barlow and 18 mm Kellner (Antares) eyepiece.
Frame capture with Snappy and processing with Adobe PhotoDeluxe.

The images were taken between 03:00-05:00 U.T.
Seeing: Excellent - 8/10. Temperature was around 10°C with no wind. Skies were clear - no clouds or haze.

1999-05-26 FS Image of Mars Friedrich Sussmann, St. Radegund, Austria, (15.50 E, 47.15 N), E-mail: friedrich.sussmann@iic.wifi.at
OES-LCCD11 Camera (KAF 400 Chip); 12-inch (300mm) f/7 Homemade Newtonian; Positive Projection with Sonnar Projectiv 20mm. EFL:14000mm. Composite of 4 - 8 frames.

Integration times:
  Red Image:    0.25s
  Green Image: 0.50s
  Blue Image:   3.00s

20:54-21:09 UT; RGB and IR stop Filter.
Seeing: 5/10

1999-05-26 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

20:18 UT (CM: 155°, left)
20:31 UT (CM: 158°, right)

Integration Times:
   Blue (+ IR Rejection)    2.00 s
   Green (+ IR Rejection)  0.50 s
   Red (+ IR Rejection)     0.25 s
Images are flat corrected.

Seeing fair to good (4-6/10). All RGB images are result of adding several images of each color. Processing with MaxEnt in MaximDL.
Traces of the South Polar Hood over Daedalia/Mare Sirenum. Yellowish cloud over Nilokeras at left limb. Some traces of (more yellowish than white)cloudiness over Tharsis and Arcadia. Is this the famous W-cloud formation in the first image? Propontis free of clouds. Some haze near the limb south of Propontis over Zephyria and Trivium Charontis. North Polar Cap (NPC) remnant very small. Note separated ice cloud just next to the NPC. Violet clearing remains evident.

1999-05-26 L_C Image of Mars Lorenzo Comolli, Gruppo Astronomico Tradatese, Tradate (VA), Italy. Email: comolli@dido.net
ST-4 camera; 8-inch (20 cm) Meade Schmidt-Cassegrain telescope; Projection at f/27.

21:00 U.T.; CM: 165°
Average of 20 images; Elaborated with Qmips32 v1.8.


27

1999-05-27 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.

02:31:49 U.T.; CM: 248°; Integration time: 0.14s
Seeing: 5-7/10; Transparency: 3/6.

1999-05-27 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:   0.22s
   490 - 590 nm:   0.18s
   610 - 720 nm:   0.24s
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: Fair; 6/10. Low humidity (~ 60%), but sky filled with smoke from local brush fires.

Bright limb haze over Promethei Terra, and Cimmeria. Blue Syrtis cloud noticeably more pronounced than in past 72 hours. Equatorial Cloud Band (ECB) intensifying somewhat, despite slight broadening. No immediately identifiable dust activity. Usual cloud cover over Elysium Mons.

1999-05-27 DMM Image of Mars David M. Moore, Phoenix, Arizona;
E-mail: davidpaulamoore@email.msn.com

1999-05-27 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 #25 red filter. Processed with Snappy, SuperFix and Micrografx Photomagic.

04:00-04:30 UT, CM: 267-274°.
Martian diameter 14.77", Ls: 145.04°; De: 22.45, Phase 0.952

Seeing: Antoniadi II.
Darkest feature is Syrtis Major, Syrtis Minor, Mare Tyrrhenm. Hellas is bright and featureless. Elysium is distinct with dark border features. North is up.


28

1999-05-28 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.

01:59:23 U.T.; CM: 229°; Integration time: 0.14s
Seeing: 5-7/10; Transparency: 3/6.

1999-05-28 DMM Image of Mars David M. Moore, Phoenix, Arizona;
E-mail: davidpaulamoore@email.msn.com

1999-05-28 BH Drawing of Mars Brad Hoehne,  Columbus, Ohio, E-mail: HoehneB@chi.osu.edu
8" (20 cm) f/6.75 Newtonian

03:20 UT
Seeing: 2

The seeing was very poor tonight. Despite great transparency, the atmosphere was quite turbulent and Mars jumped about in the eyepiece. There was no moring haze visible. Below Syrtis major a prominent albedo feature continues and seems more prominent than in my last observation. It also appears to have a "right angle" shape. Hellas about as bight as the north polar cap. Small cloud near the terminator suspected.

1999-05-28 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.

1999-05-28 L_C Image of Mars Lorenzo Comolli, Gruppo Astronomico Tradatese, Tradate (VA), Italy. Email: comolli@dido.net
ST-4 camera; 8-inch (20 cm) Meade Schmidt-Cassegrain telescope; Projection at f/27.

20:15 U.T.; CM: 136°
Average of 20 images; Elaborated with Qmips32 v1.8.


29

1999-05-29 BH Drawing of Mars Brad Hoehne,  Columbus, Ohio, E-mail: HoehneB@chi.osu.edu
8" (20 cm) f/6.75 Newtonian

00:15 UT
Seeing: 5

This is a drawing of Mars done at the Eyepiece (quickly) from the lawn of Perkins Observatory in Delaware, Ohio. I added the highlights later in Photoshop using the brightness reference that I had drawn at the eyepiece. Average seeing tonight. When I made this drawing the sky was still quite bright from twilight. There was no evening or moring haze visible. The same albedo feature near Syrtis Major I have been watching this week remains faintly visible despite Syrtis Major itself being over the evening limb. Hellas is brighter than the north polar cap. I suspect a long thin cloud extending southward from the North Polar Cap area.

1999-05-29 BH Drawing of Mars Brad Hoehne,  Columbus, Ohio, E-mail: HoehneB@chi.osu.edu
8" (20 cm) f/6.75 Newtonian

01:20 UT
Seeing: 6

The seeing seemed slightly better in this second drawing than it had been during the first drawing There was no evening or moring haze visible. The same albedo feature near Syrtis Major I have been watching this week remains faintly visible despite Syrtis Major itself being over the evening limb. Hellas is brighter than the north polar cap. I can now see a very small cloud near the north polar cap that I could not pick out before. I can no longer make out the "long thin cloud" that I had noted earlier, however.

1999-05-29 FJM Images of Mars Frank J. Melillo, Holtsville, New York, FrankJ12@aol.com

1999-05-29 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, SuperFix and Micrografx Photomagic.

04:00-04:30 UT, CM: 267-274°.
Martian diameter 14.48", Ls: 146.58°; De: 22.63, Phase 0.945

Seeing: Antoniadi III-IV.
Darkest feature Syrtis Major, Mare Tyrrhenm Elysium distinct with dark border features North is up.

1999-04-29 MJZ Drawings of Mars Mike Zweifel, Racine, Wisconsin; 88.02861° W 44.72889° N; E-mail: rasastro@wi.net
94 mm f/7 Brandon refractor, 231x.

Ls: 145.9°; De: 14.6°; Diameter: 14.6”
04:10 U.T.;  CM: 206.82°;  through 05:10 U.T.;  CM: 221.44°;
Seeing: 4-5. Transparency: (2 m).

1999-05-29 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.

04:20:49 U.T.; CM: 243°; Integration time: 0.20s
Seeing: 4-6/10; Transparency: 3/6.

1999-05-29 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.

1999-05-29 AJC Image of Mars António Cidadão, Oeiras, Portugal
ST-5C camera; 10-in (25cm) f/10 Schmidt-Cassegrain
Camera operated in low-res mode (2x binning, that is 20 micrometer square "super"-pixels).

Seeing conditions: 3/10.

Clouds over Lemuria, Panchaia, Mesogaea, Aonius Sinus.


30

1999-05-30 RWW Drawing of Mars Richard W. Wilhelm, Manorville, New York.
8" (20.3 cm) f/6 Newtonian.

Seeing: 7/10, transparency: 4/6.

The drawing on the left represents the planet at 1:30 UT. Extensive haze/clouds on the evening limb was accompanied by an area of accentuated brilliance, presumably an orographic cloud over Nix Olympica. Brilliant morning cloud observed over Libya, otherwise the morning limb was not bright. The Elysium cloud was visible but faint, seen to best advantage without filters. Haze seen over the southern region of Ausonia, strong in green light. A bright band traversing the planet from Mnemonia across Zephyria, Aeolis and Aethiopis (seen well at all wavelengths except red) appears to be an Equatorial Cloud Band (ECB) - however, a contrast effect with the surrounding dark regions may have also been partly responsible. Although Mare Cimmerium and the northern regions of Lemuria, Uchronia and Utopia were the dominant albedo features, the Hyblaeus Extension was also highly visible. More subtle was the Propontis/Trivium Charontis grouping. In moments of best seeing this region exhibited a three-part structure, consisting of (north to south) 1) Propontis 2) Phlegra/Styx-Trivium Charontis and 3) Cerberus.

The drawing on the right represents the planet later the same evening, at 3:30 UT. The now prominent brilliant cloud over Libya has rotated fully into view, partially obscuring the southeastern portion of Syrtis Major. There was still a notable lack of morning haze/clouds north of the equator, as Utopia and Casius were clearly seen with no discernable obscuration. Hesperia seen separating Mare Cimmerium and Mare Tyrrhenum, although not as clearly defined as 4/19 and 4/22. Alcyonius Nodus was visible in moments of best seeing. The bright planet-traversing band appeared broken in two by a darker region extending north from Mare Cimmerium to Elysium. The evening limb over Zephyria was especially bright.

In general, albedo features were subdued in blue light. The NPC was brilliant and well-contrasted with the surrounding areas.

1999-05-30 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 (35 cm) f/10 Schmidt-Cassegrain; Projection at f/44.

 Ls: 146.4°; De: 22.3°; Diameter: 14.6”

01:58 U.T.; C.M.: 210.45°;
Integration time: 0.18 sec.; Wratten 23a Filter.
Seeing: 6/10; Transparency: 1.5 mag. (twilight).

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

1999-04-30 MJZ Drawings of Mars Mike Zweifel, Racine, Wisconsin; 88.02861° W 44.72889° N; E-mail: rasastro@wi.net
6-inch (15 cm) f/15 refractor, 285x.

Ls: 146.4°; De: 14.5°; Diameter: 14.5”
02:10 U.T.;  CM: 213.38°.
Seeing: 5. Transparency: (2 m).

1999-05-30 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 (30 cm) f/10 SCT at efr: f/43.

02:20 UT; Calibration: Dark, Flat; Processing: Unsharp Mask via MaximCCD.
Integration time:   Infrared:   0.10 sec.;
Red: 0.22 sec.;
Green: 0.45 sec.;
Blue: 1.25 sec.;


Seeing: average, 6/10, Martian diameter 14.39", CM: 216°, Phase: .946
Filters: IR Passing 830nm, 100nm FWHM SBIF CFW8 RGB.

1999-05-30 BH Drawing of Mars Brad Hoehne,  Columbus, Ohio, E-mail: HoehneB@chi.osu.edu
8" (20 cm) f/6.75 Newtonian

03:25 UT
Seeing: 5

The seeing was average tonight. There was a small amount of evening haze visible. The same albedo feature near Syrtis Major I have been watching this week remains faintly visible and, at times, I suspected that it had split in two. Hellas is brighter than the north polar cap.

1999-05-30 RDB Drawing of Mars Bob Bunge, Bowie, Maryland, E-mail: rbunge@radix.net
20-inch (50 cm) f/6.4 reflector, 200/270x
04:05 UT
Seeing 7 out of 10.

Back after some bad weather and a week and half of vacation! North polar cap seems to be smaller, the dark area surrounding it appears to be darker and easier to see than it was two weeks ago. South polar hood apparent, including a limb extension over Syrtis Minor. Some detail seen in Mare Cimmerum. Much faint, dusky, detail seen north of Cimmerum extending to Alcyonius Nodus and the Elysium areas. Both Alcyonius Nodus and Stymphalius Lacus were visible, but missed the bright Elysium marking. Utopia had a good amount of detail, including a break/light area about 220 degrees.

1999-05-30 RHB Images of Mars Ramiro Hernandez, Saltillo, Mexico, E-mail: rhernand@campus.sal.itesm.mx
Sony Handycam camcorder and Snappy frame grabber; 8-inch (20 cm) f/10 Schmidt-Cassegrain Meade

04:22 UT, CM: 236° (left).
04:19 UT, CM: 237° (center).
04:50 UT, CM: 243° (right).

1999-05-30 L_C Image of Mars Lorenzo Comolli, Gruppo Astronomico Tradatese, Tradate (VA), Italy. Email: comolli@dido.net
ST-4 camera; 8-inch (20 cm) Meade Schmidt-Cassegrain telescope; Projection at f/27.

20:15 U.T.; CM: 118°
Average of 20 images; Elaborated with Qmips32 v1.8.

1999-05-30 AJC Image of Mars António Cidadão, Oeiras, Portugal
ST-5C camera; 10-in (25cm) f/10 Schmidt-Cassegrain
Camera operated in low-res mode (2x binning, that is 20 micrometer square "super"-pixels).

Seeing conditions: 3/10.

Clouds over Ganges and Aonius Sinus.

1999-05-30 FS Image of Mars Friedrich Sussmann, St. Radegund, Austria, (15.50 E, 47.15 N), E-mail: friedrich.sussmann@iic.wifi.at
OES-LCCD11 Camera (KAF 400 Chip); 12-inch (300mm) f/7 Homemade Newtonian; Positive Projection with Sonnar Projectiv 20mm. EFL:14000mm. Composite of 4 - 8 frames.

Integration times:
  Red Image:    0.25s
  Green Image: 0.50s
  Blue Image:   3.00s

21:40-21:48 UT; RGB and IR stop Filter.
Seeing: 4/10


31

1999-05-31 MEW Images of Mars Myron E. Wasiuta, Fredericksburg, Virginia, E-mail: wasiuta4@bigplanet.com
Lynxx CCD Camera; 6.1" (15.5 cm) f/7 Astrophysics EDF refractor; negative projection (5X barlow) and IR blocking filter.

02:20 UT, CM: 206°; Integration: 15s; Violet filter (left).
01:35 UT, CM: 195°; Integration: 2s; Red (W25) filter.
01:50 UT, CM: 243°; Integration: 3s; Green (W58) filter.
02:03 UT, CM: 203°; Integration: 3s; Blue filter.
RGB combined image.

Seeing: fair (6/10).
Images have been dark subtracted and flat-fielded using Batchpix, and then processed with unsharp mask in AstroIP.

The far left image (violet) show in addition to the South Polar Hood, a discrete cloud at the sunset limb. This may be orographic clouds at one of the Tharsis volcanoes.

1999-05-31 FJM Images of Mars Frank J. Melillo, Holtsville, New York, FrankJ12@aol.com

1999-05-31 RDB Drawing of Mars Bob Bunge, Bowie, Maryland, E-mail: rbunge@radix.net
4.25-inch (10.5 cm) f/10 reflector, 225x
03:00 UT
Seeing 9 out of 10.

Great seeing for the 4-inch scope. Dark rim seen around south polar hood. Cloud/bright marking over the Syrtis Major region. Small dark area on disk appears to be Stymphalius Lacus. Dark rim also seen around North Polar cap.

1999-05-31 T_A Image of Mars 1999-05-31 T_A Image of Mars
Tomio Akutsu, Japan; E-mail: is6t-akt@asahi-net.or.jp
32cm F/6.5 Reflector Telers2 KAF0400E CCD

1999-05-31 M_E Image of Mars Marco Eckstein, Roedental, Germany, E-mail: starlight@coburg.baynet.de
Hitachi Hi8 Videocamera; 8-inch (20 cm) Schmidt-Cassegrain (LX-10); Eyepiece Projection with a 10mm Plossl (200x).
20:50 UT; CM 123°

Seeing: bad (3/10)
North Polar Cap seems brighter - bright clouds over Chryse and Tempe - Solis Lacus the only really dark feature on Mars - South Polar Cap is seen?

1999-05-31 AJC Image of Mars António Cidadão, Oeiras, Portugal
ST-5C camera; 10-in (25cm) f/10 Schmidt-Cassegrain
Camera operated in low-res mode (2x binning, that is 20 micrometer square "super"-pixels).

Seeing conditions: 2/10.

Clouds over Daedalia and Ganges "Light" region over ganges also with R filter ?



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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.