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Marswatch

1998-1999 Apparition

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Images - 1999 April 11-20
    (All times U. T. - Images not to scale. Click on image for more or larger scale views where available.)



11

1999-04-11 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.

1999-04-11 RJN Images of Mars Ricardo Nunes, Lisbon, Portugal, E-mail: mop23816@mail.telepac.pt
Black & White QuickCam with adaptations, 4.5 inch Equatorial Reflector

Each image is the average of about 20 individual frames.

The color composites were made using a unfiltered image (infrared filtered removed) and one taken through the infrared blocking filter that comes with the QuickCam. The first image is coded as Red and and the second as Green/Blue. When assembled in such a way in Photoshop they provide, once the color balance has been adjusted, a convincent color image. But some caution should be necessary on the interpretation of results.

Due to the equipment used the images need a lot of processing to bring out details. Also the camera's dinamic range is small (6 bits) leading to the presence of some noise in the final images. These constraints mean that small features in the images are to some extent camera and processing artefacts. Nevertheless large features as Syrtis Majoris are clearly visible and reasonably well defined.

1999-04-11 DMM Image of Mars David M. Moore, Pheonix, Arizona;
E-mail: davidpaulamoore@email.msn.com

1999-04-11 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:   0.19s
   490 - 590 nm:   0.14s
   610 - 720 nm:   0.20s
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, wind; calm, average humidity (~ 90%), light smoke, assumed from vegetation fires caused by mild drought..
Bright morning limb haze persisting, covering Mare Acidalium, Chryse, Xanthe, and Margaritifer Sinus at the time of these images. This haze is accompanied by an unusual bright white blotch located approximately over the Tempe Terra region. Last observation dated 8 April, 1999, failed to detect any unusual features over aforementioned area. Much lighter limb haze observed arcing from Hellas, around to Argyre, then thining somewhat for appx 15-20 degrees, then assuming its greatest density over Margaritifer, northward.

Bright haze also observed over Hellas, giving distinct impression in 400 - 510 nm band of a slight atmospheric bulging over region. This particular feature seems to be the strongest in the 400 - 510 nm band, stronger even than the NPH, Syrtis cloud, or any of the limb phenomena.

Distinct blue Syrtis Cloud observed, along with less dense haze around western perimeter of Syrtis Major. Evening terminator showing slight haze over Isidis, possibly far western Elysium, down to northern Hesperia Planum.

No bright features in 600 - 720 nm band to indicate any current dust activity.

1999-04-11 RWW Drawing of Mars Richard W. Wilhelm, Manorville, New York. 4.5" (11.4 cm) F/8 Newtonian.
Seeing: 8/10, transparency: 5/6.
Primary albedo features readily visible in integrated, red and green light, substantially subdued in blue light (in contrast to 4/9 observation). Acidalia and Niliacus Lacus partially obscured by morning clouds/limb haze. Extremely bright morning cloud over Chryse, prominent at all wavelengths - possible dust involvement due to high visibility in red. Syrtis Blue Cloud evident on eastern (evening) fringe of Syrtis Major. Brightening on southern limb, visible in green light - South Polar Hood? Hellas and NPC bright.

1999-04-11 FJM Images of MarsFrank J. Melillo


12

1999-04-12 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.


13

1999-04-13 J_P Image of Mars J. Porto, Azores

1999-04-13 CEH Drawing of Mars Carlos E. Hernandez (A.L.P.O. Mars Section)
8-inch (20-cm) f/7.5 Newtonian reflector at 234x and Wratten 23A, 30, 38A and 58 filters.

03:40 UT (CM: 290.4°, Filter: Wratten 23A (red), left)
04:30 UT (CM: 302.6°, Filter: Wratten: 38A (blue), right)
Ls: 123.6°, De: 16.5°; Dia: 15.3".

The North Polar Cap (NPC) appears brilliant (10/10) and small surrounded by an extremely bright (9/10) haze extending from both morning and evening (9/10) limbs. Utopia (with a beak-like Casius) and Umbra appear dark (3/10) south and southeast of the NPC. Boreosyrtis appears as a dark (3/10), worm-like albedo feature extending over a bright (7/10) Dioscuria. A dusky (4/10) Protonilus appears to connect with Boreosyrtis over it's southern border. Protonilus merges to the southwest with a dark (3/10) Ismenius Lacus and a dusky (4/10) Deuteronilus (it's following end appearing to merge with a dusky (4/10) Niliacus Lacus adjacent to an extremely bright (9/10) morning limb haze (MLH). The preceding border of Mare Acidalium appears dusky (4/10) adjacent to the MLH. Nodus Alcyonius appears as a dark (3/10) tear-drop shaped albedo feature over Aetheria (7/10) p. the CM. Syrtis Major appears prominent (3/10) on the CM with a thin (transparent), bright (7/10) cloud over Oenotria appearing to extend from another very bright (8/10) cloud over Libya. Astaboras and Astaborae Fons are visible extending from the north-following (Nf) corner of Syrtis Major. Mare Tyrrhenum appears dark (3/10) over the Np limb. A very to extremely bright (8-9/10) cloud is visible over Hellas appearing to merge with an extremely bright (9/10) south polar hood (SPH). Hellespontus appears as a thin, dark (3/10) albedo feature extending from the southern border of Iapygia Viridis (3/10). The preceding half of Sinus Sabaeus (3/10) is visible over the south-following (Sf) limb. Deucalionis Regio appears obscured by an extremely bright (9/10) cloud (part of the MLH).

A blue light (W38A) observation on the right made on the same date and instrument at 04:30 UT (CM: 302.6). All limbs appear extremely bright (9/10). The NPC appears obscured by a very to extremely bright (8-9/10) haze. A very bright cloud appears to extend from an extremely bright (9/10) ELH over Aetheria appearing to obscure the northern end of Syrtis Major as well as a thin very bright (8/10) cloud along the following border of Syrtis Major over Aeria. A blue clearing (0-3) of 2-3 was noted at this time.

1999-04-13 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: 123.5°; De: 16.5°; Diameter: 15.3”
05:54 U.T.;  CM: 320.52°;  Integration time: 0.22s, 23A and IR Rejection Filter.
06:02 U.T.;  CM: 324.91°;  Integration time: 0.65s, Near IR 800 - 1100nm, IR Passing/Visible Rejection.

Filters: Murnaghan Instruments Filters.

Seeing: Poor - #5-1/2; Transparency: 4 mag.
Processing: CCDSoft-Image Processing Software; Skypro-Image Processing Software

1999-04-13 DMT Drawing of Mars Daniel M. Troiani, ALPO Mars Section Head, Chicago, Illinois
18" f/6 reflector (Late Jim Carroll's scope) 386x;  04/13/99 06:22-06:45 UT

CM: 330°;  Ls: 123.6°; De: 16.5°
Filters: W#47, W#25, W#80A
Seeing: 7;  Transparency: 5
Observing location: Dan Joyce House-Chicago.
Observed Mars with half of the Mars section-Dan Joyce and Don Parker.

Blue (Violet) Clearing (0-3): 2.5

Very good "Blue Clearing"=2.5. Hellas very bright with fog and clouds. Thin clouds around the small north polar cap (NPC). Light clouds over Elysium. Light clouds over Chryse extending over Oxus. There was a very slight hint of a faint equatorial cloud band (ECB). Sytris Blue Cloud was visible over S.M. extending toward and over Elysium. This cloud had a green tint to it when view with a yellow filter-W#11


14

1999-04-14 FJM Images of MarsFrank J. Melillo

1999-04-14 J_S Image of Mars Jack Schmidling, Marengo, Illinois; E-mail: arf@mc.net
Video Camera, 16-in (40 cm) telescope

This photo was taken on April 14 through the 16" telescope with a video camera. On a scale of 1-10, the seeing was about 5. As poor seeing effects are directly proportional to the size of the telescope, I took this image using a mask or diaphragm that stopped the telescope down to 6". To fully utilize the capabilities of this telescope, seeing has to be 8 or better.

The seeing was just good enough to be able to identify a few of the major surface features, some of which are identified in the image on the right.

1999-04-14 J_S Image of Mars Jack Schmidling, Marengo, Illinois; E-mail: arf@mc.net
Video Camera, 16-in (40 cm) telescope

This image is another frame from the same session. I seem to have forgotten a processing trick that enhanced the contrast substantially. For those interested, I boxed in the disk tightly before using the "Equalize" mode and then expanded the background.


15

1999-04-15 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.

1999-04-15 AJC Image of Mars António Cidadão, Oeiras, Portugal
ST-5C camera 10-in (25cm) f/10 Schmidt-Cassegrain

For color work I use a SBIG's motorized filter wheel equipped with their old RGB filter set (which needs a IR-blocking filters; the transmitance curves for the filters are posted at their web page).

Each final filtered image is the average of 30 original images, all obtained in a 2-5 min interval. The original image sampling was maintained in the images I'm sending, and the CM and UT values indicated correspond to the middle of each filtered image series.

Bright clouds over Hellas and Elysium; hints of an equatorial cloud band (ECB) but with evident limb brightning; not very conspicuous Syrtis blue cloud; Cerberus faintly visible.

1999-04-15 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)   10.00s
   Green (VG9 + IR Rejection)    4.25s
   Red (RG610 + IR Rejection)   0.41s
Images flat and dark corrected.
Very poor conditions: High winds (ENE 6-17 knots) with frequent fast moving clouds. Seeing fairly good, however (6-7). Transparency 0-5m. No dew.
Strong (3+) violet clearing both hemispheres -- also noted visually with Wratten-47 filter. Brilliant clouds over Hellas. In red light Zea Lacus detected on the floor of Hellas. Elysium cloud bright on terminator. Bright am limb cloud. Some haze over Libya but clouds over Aeria-Moab much weaker than on 12 March: No equatorial cloud band (ECB).

1999-04-15 HEA Image of Mars Hernan Acosta, Valencia, Venezuela (10° 11.0' N, 68° 00.0' W)
4.5-inch Newtonian, 9mm Kellner, 2x Barlow
04:20 UT; CM 281°

1999-04-15 T_P Image of Mars Tim Parker, Los Angeles, California
Starlight Xpress HX516, binned 2x2; 8" (20 cm) f/6 Springfield Newtonian; Eyepiece projection.

We finally got some good seeing for a change around here! The seeing started out being about average an hour or so before I started imaging, then it improved steadily to about an "8" at around 1:30am PDT, but then decreased somewhat to about a 6 by the time I stopped imaging. (This is a vast improvement over the past few weeks, when it seemed that even the streetlights were twinkling). It was foggy in the Arroyo Seco below the hilltop where I live, and slightly foggy at my observing site. I had heavy dew conditions, such that I could not center effectively with my 4.25" SCT guidescope because the corrector was covered with dew. The local weatherman was apologizing for the fog, but I hope these conditions last for a while!


16

1999-04-16 AJC Image of Mars António Cidadão, Oeiras, Portugal
ST-5C camera 10-in (25cm) f/10 Schmidt-Cassegrain

For color work I use a SBIG's motorized filter wheel equipped with their old RGB filter set (which needs a IR-blocking filters; the transmitance curves for the filters are posted at their web page).

Each final filtered image is the average of 30 original images, all obtained in a 2-5 min interval. The original image sampling was maintained in the images I'm sending, and the CM and UT values indicated correspond to the middle of each filtered image series.

Bright clouds over Elysium and Nix Olympica; hints of ECB but with evident limb brightning; very conspicuous Syrtis blue cloud; Cerberus faintly visible. Propontis and Hyblaeus Extension quite visible.

1999-04-16 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: 310°. A dichroic filter with a passband of 610-720 nm.was used with an integration of .0188 second.

1999-04-16 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.

05:00-05:20 UT, CM: 289°-303°.
Seeing Antoniadi III, Martian diameter 15.5", De: 17.24, Phase .996

Darkest features Syrtis Major, Mare Tyrrhenum. Bright areas noticed over Hellas. North is up.

1999-04-16 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)   13.00s
   Green (VG9 + IR Rejection)    5.00-5.75s
   Red (RG610 + IR Rejection)   0.50s
Images flat and dark corrected.
Very poor conditions: Winds SSE at 4-7 knots with frequent fast moving clouds. Seeing only fair (5). Transparency 0-4m with haze in addition to clouds. No dew.
Strong (3+) violet clearing both hemispheres -- also noted visually with Wratten-47 filter. Brilliant clouds over Hellas. In red light Zea Lacus detected on the floor of Hellas. Bright morning limb cloud. Some haze over Libya but clouds over Moab much weaker than on 12 March. Small cloud over Aeria. Weak equatorial cloud band (ECB)?.

1999-04-16 DMM Image of Mars David M. Moore, Pheonix, Arizona;
E-mail: davidpaulamoore@email.msn.com

1999-04-16 A_T Image of Mars1999-04-16 A_T Image of Mars Tomio Akutsu, Japan; E-mail: is6t-akt@asahi-net.or.jp

32cm F/6.5 Reflector Telers2 KAF0400E CCD


17

1999-04-17 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)   13.75s
   Green (VG9 + IR Rejection)    5.50s
   Red (RG610 + IR Rejection)   0.53s
Images flat and dark corrected.
Seeing fair (5-6). Transparency 3.5-4m with haze and smoke. No dew.
Strong (3+) violet clearing both hemispheres except for cloud across Syrtis Major -- also noted visually with Wratten-47 filter. Weak Syrtis Blue Cloud, also noted visually in I.L. and with W-11 filter. Brilliant clouds over Hellas. Haze over Libya; Elysium cloud very bright. Hyblaeus Extension broad, dark.

1999-04-17 T_P Image of Mars

Tim Parker, Los Angeles, California
Starlight Xpress HX516, binned 2x2; 8" (20 cm) f/6 Springfield Newtonian; Eyepiece projection.

The seeing started out being about an 8 when I started imaging, then it improved slightly to a 9 at around 10:00pm PDT (locally late evening on the 16th). Visually, the brightness of the morning and evening limb hazes was stunning, with the clouds over northern Syrtis extending north and west toward Arabia.


18

1999-04-18 AJC Image of Mars António Cidadão, Oeiras, Portugal
ST-5C camera 10-in (25cm) f/10 Schmidt-Cassegrain

See April 16 image for imaging details and commentary.

1999-04-18 DF Image of MarsDenis 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, #21 orange filter. Processed with Snappy and Micrografx Photomagic.

04:45-05:00 UT, CM: 262°-266°.
Seeing Antoniadi III-IV, Martian diameter 15.69", De: 17.52, Phase .997

Darkest features Syrtis Major, Mare Tyrrhenum. Bright areas noticed over Hellas North is up.

1999-04-18 J_S Image of Mars Jack Schmidling, Marengo, Illinois; E-mail: arf@mc.net
Video Camera, 16-in (40 cm) telescope

1999-04-18 DMM Image of Mars David M. Moore, Pheonix, Arizona;
E-mail: davidpaulamoore@email.msn.com


19

1999-04-19 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.

1999-04-19 AJC Image of Mars António Cidadão, Oeiras, Portugal
ST-5C camera 10-in (25cm) f/10 Schmidt-Cassegrain

See April 16 image for imaging details.

Seeing conditions (5-6/10). Bright clouds over Elysium and Nix Olympica; evident limb brightning; very conspicuous Syrtis blue cloud; Cerberus faintly visible. Propontis and Hyblaeus Extension quite visible.

1999-04-19 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: 126.8°; De: 17.5°; Diameter: 15.8”
02:57 U.T.;  CM: 218.81°;   Integration time: 0.36s   Seeing: #3-1/2; Transparency: 4 mag.
04:17 U.T.;  CM: 237.83°;   Integration time: 0.25s   Seeing: #4-1/2; Transparency: 3-1/2 mag.

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

1999-04-19 FJM Images of MarsFrank J. Melillo

1999-04-19 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 11-in (30cm) f/10 SCT at efr: f/48.

05:08 UT; Integration time: 0.15 sec.; Calibration: Dark, Flat; Processing: Unsharp Mask via MaximCCD.
Seeing: 7/10, Martian diameter 15.76", CM: 259°, Phase: .9983
Filters: IR Passing 830nm, 100nm FWHM.

1999-04-19 RWW Drawing of Mars Richard W. Wilhelm, Manorville, New York. 4.5" (11.4 cm) F/8 Newtonian.
Seeing: 9/10, transparency: 5/6.
Primary albedo features readily visible in integrated, red and green light, with absolutely no diminution of intensity in blue light (using W80A), suggesting a substantial violet clearing. Excellent seeing is underscored by the observed sharp demarcation (Hesperia region) between Mare Tyrrhenum and Mare Cimmerium. Hellas brilliant. NPC small but bright. Bright cloud over Elysium. Morning limb brightening most pronouced over Cydonia and Eden. Best observing session thus far for the present apparition and well worth the following day's sleep depravation lethargy!

1999-04-19 RCK Images of Mars Robert C. Kuberek, Valencia, California
SX MX5-C CCD, 6" (15cm) Astrophysics Refractor @ f/21.

All 0.20 sec. exposures in Integrated Light (no IR Rejection)
Seeing: Poor/Fair (4), Transparency: good (4.5mag).

Hellas bright. Elysium cloud bright, forming an Evening Limb Haze (ELH), NPC rather faint, and small. Weak Morning Limb Haze(MLH) visible over Moab - Eden.

1999-04-19 DMM Image of Mars David M. Moore, Pheonix, Arizona;
E-mail: davidpaulamoore@email.msn.com

1999-04-20 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

23:47 UT (CM: 173°, left)
00:02 UT (CM: 176°, center)  (1999-04-20)
00:36 UT (CM: 185°, right) (1999-04-20)

Integration Times:
   Blue (+ IR Rejection)   1.00 s
   Green (+ IR Rejection)    0.30 s
   Red (+ IR Rejection)   0.10 s
Images are flat corrected.

Seeing rather good (6/10). All RGB images are result of adding several images of each color. Processing with MaxEnt in MaximDL.
Strong clouds over Nix Olympica and Arcadia. Note yellowish cloud over Mare Boreum. Elysium very cloudy. Small North Polar Cap remnant. Voilet clearing evident.


20

1999-04-20 CEH Drawing of Mars Carlos E. Hernandez (A.L.P.O. Mars Section)
8-inch (20-cm) f/7.5 Newtonian reflector at 218x and Wratten 23A, and 38A filters.

03:15 UT (CM: 222.8°, Filter: Wratten 23A (red), left)
04:10 UT (CM: 236.2°, Filter: Wratten: 38A (blue), right)
Ls: 126.9°, De: 17.5°; Dia: 15.8".

1999-04-20 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)   15.00-22.50s
   Green (VG9 + IR Rejection)    5.50-7.50s
   Red (RG610 + IR Rejection)   0.44-0.55s
Images flat and dark corrected.
Seeing fair (4-5). Transparency 3.5-3m with haze and smoke from the Everglades. Wind NNE 0-1 knots. No dew.
Strong (3+) violet clearing both hemispheres except for cloud across Syrtis Major -- also noted visually with Wratten-47 filter. Syrtis Blue Cloud, also noted visually in I.L. and with W-11 filter. Brilliant clouds over Hellas. Wispy haze over Libya; Elysium cloud very bright. Hyblaeus Extension broad, dark. Cerberus III noted. Cerberus-Trivium only 2-3 dots.

1999-04-20 J_S Image of Mars Jack Schmidling, Marengo, Illinois; E-mail: arf@mc.net
Video Camera, 16-in (40 cm) telescope
1999 April 20, 04:04:46 UT.

1999-04-20 GRW Images of Mars Greg R. Wilson, Los Angeles, California
Starlight Xpress HX516 CCD, 8" (20 cm) Celestron SCT, Eyepiece Projection: 15mm Plossl. Filter: #25 Red

1999-04-20 A_T 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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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 July 14, 1999.