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Marswatch

1998-1999 Apparition

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



1

1999-07-01 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.

01:39:35 U.T.; CM: 269°; Integration time: 0.35s
Seeing: 5 to 6 at best/10; Transparency: 4/6.

Shooting through holes in the clouds. Great fun, but crummy air. Hellas is bright. Syrtis Major is dark with a blue tint; possible blue cloud? The North Polar Hood and evening limb arc are prominent. There is a brightening on morning terminator - possible frost? Utopia is clear.

1999-07-01 RHB Images of Mars Ramiro Hernandez, Saltillo, Mexico, E-mail: rhernand@campus.sal.itesm.mx
Electrim CCD camera; 8-inch (20 cm) f/10 Schmidt-Cassegrain Meade

04:10 UT, CM: 306°.
Integration time: 0.300 s.; 3-frame average.


2

1999-07-02 RHB Images of Mars Ramiro Hernandez, Saltillo, Mexico, E-mail: rhernand@campus.sal.itesm.mx
Electrim CCD camera; 8-inch (20 cm) f/10 Schmidt-Cassegrain Meade

04:00 UT, CM: 295°.
Integration time: 0.300 s.; 4-frame average.


3

1999-07-03 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.

01:45:20 U.T.; CM: 251.62°; Integration time: 0.6s
Seeing: 7.5/10; Transparency: 2/6.

Evening was hot, hazy and humid, reducing transparency remarkably. Significant development of North Polar Hood (NPH) continues from June 30th. The evening limb arc is remarkable in red light. It shows a yellow band in color image. Syrtis Major on the morning terminator looks bluish, but no sign of cloud development. The Elysium area is darker than surrounding desert.


4

1999-07-04 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.

04:35 U.T., CM: 274°.
Martian diameter 11.12"; De: 22.13, Phase 0.881

Seeing: Antoniadi II.
Darkest feature Syrtis Major, Mare Tyrrhenum. North is up.

1999-07-04 AJC Image of Mars António Cidadão, Oeiras, Portugal
ST-5C camera 10-in (25cm) f/10 Schmidt-Cassegrain

Seeing conditions continue to be unfavourable (3/10), and thus I had to use the camera in low resolution mode (2x binning, that is 20 micrometer square "super"-pixels). Clouds near Propontis Complex and over Mare Boreum. Bright evening limb arc. Haze over North Polar Cap and Phaethontis? Some regions on Arcadia and Memnonia bright with the red filter.


5

1999-07-05 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)   23.40s
   Green (VG9 + IR Rejection)    7.41s
   Red (RG610 - no IR Rejection)   0.64s
Images flat and dark corrected.
Seeing very poor (3-4) Transparency 3.0-4.0m frequent clouds and thunderstorms. Winds NE 1-3 knots.
Bright South Polar Hood; North Polar Cap not visible but North Polar clouds possible -- seeing too poor to determine. Hyblaeus Extension, Propontis II dark; Trivium-Cerebrus still very faded. Bright evening limb arc. Possible Equatorial Cloud Band across Zephyria.

1999-07-05 T_P Image of Mars Tim Parker, Los Angeles, California
Starlight Xpress HX516, binned 2x2; 8" (20 cm) f/6 Springfield Newtonian; Eyepiece projection.

1999-07-05 AJC Image of Mars António Cidadão, Oeiras, Portugal
ST-5C camera 10-in (25cm) f/10 Schmidt-Cassegrain

Seeing conditions continue to be unfavourable (3/10), and thus I had to use the camera in low resolution mode (2x binning, that is 20 micrometer square "super"-pixels). Clouds near Propontis Complex and over Mare Boreum. Bright evening limb arc. Haze over North Polar Cap and Phaethontis? Some regions on Arcadia and Memnonia bright with the red filter. Nix Olympica visible on July 05?

1999-07-05 TWL Image of Mars Tan Wei Leong, Singapore (1.3° N 101.8° E), E-mail: weileong@magix.com.sg
ST-7E CCD camera; 5" (128mm) f/8 Takahashi FS128 APO refractor to F/32 with 5x barlow and IR rejection filter.

Integration Time: R: 0.50s; Average of 15 images;
B: 1.80s; Average of 13 images;
G: Average of R and B images.


6

1999-07-06 FJM Images of Mars Frank J. Melillo, Holtsville, New York, FrankJ12@aol.com

1999-07-06 RWW Drawing of Mars Richard W. Wilhelm, Manorville, New York, E-mail: rs-wilhelm@worldnet.att.net.
8" (20.3 cm) f/6 Newtonian.

Seeing: 5-8/10, transparency: 3/6. Bermuda High accompanied by heavy haze. Second day of 100+ temperatures. Excellent seeing at twilight deteriorating with planet's decreasing altitude.

Heavy haze provided the requisite 'filtering' during twilight, with standard filters used later in the observing session. Most striking was the beautiful symmetry of the North Polar Haze and South Polar Hood - aside from size, they were virtually identical in appearance and were connected by a strong evening limb arc. No evidence of the North Polar Cap (NPC), although the obscuring haze was less extensive in red light. Mare Cimmerium, Mare Boreum, Uchronia and Lemuria were the prominent dark areas, with the Hyblaeus Extension and Propontis/Trivium/Cerberus fainter but easily visible. A subtle "Hershey Kiss"-shaped albedo feature was observed extending north from Mare Cimmerium to Cerberus I which corresponds to the area occupied by the Cyclops "canal" on Schiaparelli's Mars map. In general, albedo features were strong in blue-green light, less so in blue. Elysium cloud faint and difficult to see.

1999-07-06 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)   17.10-20.9s
   Green (VG9 + IR Rejection)    5.32s
   Red (RG610 - no IR Rejection)   0.44-0.53s
Images flat and dark corrected.
Seeing fair (5-6), variable. Transparency 0-4.5m, frequent clouds and thunderstorms. Winds NNE 1-10 knots, gusty.
Bright South Polar Hood; North Polar Cap not visible but North Polar clouds (?Hood) bright. Hyblaeus Extension, Propontis II dark; Trivium-Cerebrus still very faded. Bright evening limb arc. Clouds over Zephyria. Hades I-Azania-Propontis I and Hyblaeus very dark in green light.

1999-07-06 SW Image of Mars Sylvain Weiller, St Remy lès Chevreuse, France (Lat 48° 42' N, Long 2° 04' E, 30 Km SW of Paris, France) E-mail: weiller@cochin.inserm.fr.
Quickcam Pro (no infrared blocking filter), 8-in (20 cm) f/10 Schmidt-Cassegrain on an SP Perl Vixen equatorial mount, Eyepiece Projection, 26mm Celeston Plossl eyepiece. Camera located 22 cm from eyepiece.

20:50 U.T.
Addition of 8 images. Treatment: coregistering and wawelet with Prism software.


7

1999-07-07 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)   15.20s
   Green (VG9 + IR Rejection)    4.37s
   Red (RG610 - no IR Rejection)   0.38s
Images flat and dark corrected.
Seeing GOOD (7-8) but high NE winds (4-13 knots), gusty. Transparency 0-4.5m, frequent clouds.
Bright South Polar Hood; North Polar Cap not visible on images or visually but North Polar clouds (?Hood) bright. Bright evening limb arc. Clouds over Zephyria. Hyblaeus Extension, Propontis II dark; Trivium-Cerebrus still very faded. Hades, Styx, Erebus, and Boreas prominent. Note halftone streak running from Cimmerium M. to Pambotis Lacus at the southern tip of Cerebrus. This may be the feature "Antaeus." Hades I-Azania-Propontis I and Hyblaeus very dark in green light.

1999-07-07 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; Negative Projection at f/33.

02:34:22 U.T.; CM: 224°; Integration time: 0.28s
Seeing: 6-7/10; Transparency: 4/6.


8

1999-07-08 RWW Drawing of Mars Richard W. Wilhelm, Manorville, New York, E-mail: rs-wilhelm@worldnet.att.net.
8" (20.3 cm) f/6 Newtonian.

Seeing: 5/10, transparency: 5/6. Passage of cold front and accompaning turbulence resulted in mediocre seeing.

Propontis/Trivium/Cerberus on the central meridian. Strong Evening Limb Haze. South Polar Hood, while not as prominent as on 7/6, appears to extend over southern Mare Sirenium and Mare Cimmerium. North Polar Haze also less extensive in both blue and green - reduced area of brightness in red indicates a possible sighting of the underlying North Polar Cap. The subtle albedo feature extending north from Mare Cimmerium to Cerberus I (seen on 7/6) was faintly visible. Elysium cloud extremely faint. Equatorial Cloud Band over Mnemonia and Zephyria suspected.

1999-07-08 JM Drawings of Mars Jörg Meyer, Schoolobservatory Gudensberg, Germany, E-mail: joerg.meyer@planet-interkom.de

20:08 U.T.; CM: 114°


9-14

No Images.


15

1999-07-15 J_P Images of Mars J. Porto, Azores


16

1999-07-16 MEW Images of Mars Myron E. Wasiuta, Spotsylvania, Virginia, E-mail: wasiuta4@bigplanet.com
Lynxx CCD Camera; 6.1" (15.5 cm) f/7 Astrophysics EDF refractor; at f/35 negative projection (5X barlow) and IR blocking filter.
U.T. CM:   Filter
01:44 (left) 128° Red (W25)
01:48 129° Green (W58)
01:49 130° Blue (W80A)
01:54 (right) 131° Violet (W47)

Seeing: Fair (5/10 ALPO).

1999-06-16 DMM Image of Mars David M. Moore, Phoenix, Arizona;
E-mail: davidpaulamoore@email.msn.com


17-18

No Images.


19

1999-07-19 J_P Images of Mars J. Porto, Azores


20

1999-07-20 DMM Image of Mars David M. Moore, Phoenix, Arizona;
E-mail: davidpaulamoore@email.msn.com


21

1999-07-21 RWW Drawing of Mars Richard W. Wilhelm, Manorville, New York, E-mail: rs-wilhelm@worldnet.att.net.
8" (20.3 cm) f/6 Newtonian.

Seeing: 8/10, transparency: 5/6. Good seeing during twilight. Shrinking observing window effectively limiting observation until end of twilight - subsequent rapid deterioration of seeing due to planet's decreasing altitude.

North Polar Haze (hood proper?) prominent in blue light, reaching farther south then any post-conjunction observation thus far this apparition. The outer perimeter exhibited a strong blue-white coloration and appeared for want of a better word "translucent" (Chromatic effects of Earth's atmosphere can be ruled out as there was no "rainbow" effect evident anywhere else on the disc). Strong evening limb arc, diminishing in intensity southeast of the Mare Erythraeum group and connecting with the South Polar Hood (SPH), which was not as extensive as in other recent observations. Chryse/Xanthe not bright in red, slightly brighter than surrounding desert in blue and green. Bright cloud over Syria. During moments of best seeing, numerous patchy clouds were seen over Tharsis and Arcadia in green light. Unfortunately, they were too fleeting to record accurately and no attempt was made to approximate them in my drawing. Albedo features subdued in blue light but fairly strong in green.

1999-07-21 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)   16.72s
   Green (VG9 + IR Rejection)    5.32s
6743   Red (RG610 - no IR Rejection)   0.53s
Images flat and dark corrected.
Seeing: good (7-8); high ENE wind (5-10 kts), gusty. Transparency: 0-4.5m, frequent clouds.
Tiny North Polar Cap possible on red light images. South polar clouds; Mars's orientation (De does not permit visualization of definite South Polar Cap. Candor bright in all filters. Evening limb arc; some clouds extending into eastern Chryse.

1999-07-22 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/48

Integration Times:
   400 - 510 nm:   0.27s
   490 - 590 nm:   0.18s
   610 - 720 nm:   0.27s
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: Poor, 3/10. Wind: calm, low humidity (~ 80%). (~ 70%).

A dry Mars presented itself, with little of the heavy haze imaged earlier this year. Slight evening haze, limb haze over Aonia, with slight haze observed over extreme northern lattitudes. No immediately identifiable isolated clouds, though poor seeing would render their imaging rather difficult. Bright streak in 610 - 720 nm band due north of Valles Marineris, over Lunae Planum observed. Possible dust activity??


23

1999-07-23 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.

01:27:52 U.T.; CM: 58°; Integration time: 0.6s
Seeing: 4-6/10; Transparency: 3/6.


24

1999-07-24 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)   17.10s
   Green (VG9 + IR Rejection)    5.32s
   Red (RG610 - no IR Rejection)   0.44s
Images flat and dark corrected.
Seeing: good (7-8); Wind: S-SSW (0-5 kts). Transparency 0-4.5m, intermittent clouds.
South polar clouds; Mars's orientation (De) doesn't permit visualization of definite South Polar Cap. Candor remains bright. Evening limb arc. Cloud over Tempe. Morning arctic cloud noted in blue light. Hydaspes again noted.


25

No Images.


26

1999-07-26 FJM Images of Mars Frank J. Melillo, Holtsville, New York, FrankJ12@aol.com


27

1999-07-27 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)   18.62s
   Green (VG9 + IR Rejection)    5.32s
   Red (RG610 - no IR Rejection)   0.44s
Images flat and dark corrected.
Seeing: poor (3-4); Wind: S (0-3 kts). Transparency: 4.5m.
Evening limb arc. Morning arctic cloud again noted in blue light. South Polar Hood. Hydae Sinus and Cantabras prominent.

1999-07-27 TWL Image of Mars Tan Wei Leong, Singapore (1.3° N 101.8° E), E-mail: weileong@magix.com.sg
ST-7E CCD camera;

8" (20 cm) Celestron Schmidt-Cassegrain at F/24 with 5x barlow.
Integration Time: R: 0.40s; Average of 13 images;
B: 1.40s; Average of 23 images;
G: Average of R and B images.

5" (128mm) f/8 Takahashi FS128 APO refractor to F/32 with 5x barlow and IR rejection filter.
Integration Time: R: 0.30s; Average of 8 images;
B: 1.50s; Average of 12 images;
G: Average of R and B images.


28

1999-07-28 RWW Drawing of Mars Richard W. Wilhelm, Manorville, New York, E-mail: rs-wilhelm@worldnet.att.net.
8" (20.3 cm) f/6 Newtonian.

Seeing: 9/10, transparency: 5/6. Excellent seeing, best so far this apparition. Planet's decreasing altitude had no detrimental effect as session progressed. Observation continued until planet fell behind tree line.

Sinus Meridiani on the central meridian. North Polar haze prominent, with an apparent extension reaching southwest to the northern border of Mare Acidalium. This same feature was seen on 6/23. No sign of North Polar Cap (NPC), although as with past observations, the obscuring haze was less extensive in red and orange light. Prominent evening limb haze/clouds, obscuring Syrtis Major. The South Polar Hood (SPH) appeared not to extend fully to the southern limb, as the planet's surface bordering the southern limb (specifically the region Chalce) was visible. With Southern Hemisphere Spring just days away, this curious aspect of the SPH may be a sign of its imminent break-up. Chryse exhibited its typical brightness in orange light. Desert regions of Eden, Moab and Arabia were bright, the Cydonia region was somewhat darker. Albedo features appeared darker in green than in blue, although the effect was not pronounced.

1999-07-28 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)   20.90s
   Green (VG9 + IR Rejection)    5.70s
   Red (RG610 - no IR Rejection)   0.46s
Images flat and dark corrected.
Seeing: fair (6); Wind: WSW (0-3 kts). Transparency 4.0m.
Evening limb haze with some extension into Moab. Syrtis Major visible on evening limb under haze. Arctic clouds again noted in blue light. South Polar Hood/clouds over Noachis. Cantabras prominent.

1999-07-28 TWL Image of Mars Tan Wei Leong, Singapore (1.3° N 101.8° E), E-mail: weileong@magix.com.sg
ST-7E CCD camera;

8" (20 cm) Celestron Schmidt-Cassegrain at F/24 with 5x barlow.
Integration Time: R: 0.40s; Average of 13 images;
B: 1.40s; Average of 23 images;
G: Average of R and B images.

5" (128mm) f/8 Takahashi FS128 APO refractor to F/32 with 5x barlow and IR rejection filter.
Integration Time: R: 0.30s; Average of 8 images;
B: 1.50s; Average of 12 images;
G: Average of R and B images.


29

No Images.


30

No Images.


31

1999-07-31 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.

01:42:09 U.T.; CM: 344°; Integration time: 0.4s
Seeing: 6-7/10; Transparency: 4/6.



Go to August 1999's Images;

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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 August 28, 1999.