LtE in CMO #275

From P Clay SHERROD



. . . . . . . .Date: Fri, 11 July 2003 06:16:13 -0500

Subject: Mars, July 10, 2003

 

Very turbulent air this morning and I was lucky to get even this it seems; some interesting features appearing in mid-latitudes.

 

. . . . . . . Date: Sun, 13 July 2003 09:19:24 -0500

Subject: Mars - July 13, 2003

 

An image of Mars from this morning; stepped the focal ratio of the 16" up to f/35 and produced better results under still-poor seeing conditions. Olympus Mons and Phoenicis Lacus are clearly identified on western limb.

 

. . . . . . . .Date: Mon, 14 July 2003 05:08:47 -0500

Subject: Mars, Steady skies July 14

 

Finally got a bit of steady air this morning thanks to some thick fog; images shows Mars at f/35 via the Toucam, 890 images stack with IR block; 0.41m SCT.

 

. . . . . . . .Date: Tue, 15 July 2003 10:35:55 -0500

Subject: Mars, July 15 / Tharsis volcano visibility

 

Mars this morning under poor seeing, but the Tharsis volcanoes are clearly seen; these images are one hour apart and it is clear that the sunrise angle on these peaks clearly plays into their visibilities as the features near sunset and the angles become more pronounced (the 10:15 UT image).

 

. . . . . . . .Date: Wed, 16 July 2003 10:23:15 -0500

Subject: Daedalia dust? July 16, 2003

 

Good morning....again very unstable air plagues our attempts but two images obtained about an hour apart early this morning. However, in the later image, there appears to be a possibility of dusty obscuration immediately east of Daedalia and slightly SW of Mare Sirenum.

 

Note that even without the strong terminator shadow present, Olympus Mons is clearly visible near the CM.

 

. . . . . . . .Date: Thu, 17 July 2003 04:35:06 -0500

Subject: Mars/Olympus Mons and red veil

 

Attached is our image of Mars from this morning (July 17) in fair skies and steadiness; much detail visible around the Solis Lacus, but I want to point out the continued red veil over and around Olympus Mons as reported yesterday by Don Parker and others. Very curious and seemingly more intense than recorded yesterday. Note the small brownish- yellow cloud located between Mare Sirenum and Daedalia as reported yesterday.

 

. . . . . . . .Date: Thu, 17 July 2003 05:09:32 -0500

Subject: Intense white spot on SPC perimeter

 

I would like to point out to Mars observers a very prominent scintillating white spot seen in all of our images from this morning on the perimeter of the SPC, near the melt line, but just inside the white cap itself. The very bright and small spot is clearly visible in the image just posted at ASO (link in forwarded message below) but also in images that are currently being processed and will be distributed very soon. Without a final measure, the spot appears to be at about CM 135 deg. and just inside the SPC perimeter; it is so intense that this could be easily distinguished on the closed circuit TV while imaging and I strongly suspect that it was clearly visible visually to the trained eye.

 

. . . . . . . .Date: Thu, 17 July 2003 05:52:31 -0500

Subject: More Mars, ASO, July 17

 

Two additional images from later this morning; the Tharsis volcanoes are well demonstrated as are reddish features in this region that do not appear to be processing artifacts ,as they are rotating with the planet.

 

Note also the scintillating white spot on the SPC perimeter (somewhat overshadowed in glare on these two images).

 

. . . . . . . .Date: Fri, 18 July 2003 06:22:31 -0500

Subject: ASO Mars, July 18

 

A couple of fairly detailed images from this morning (July 18 UT) showing the vicinity of Solis Lacus and surrounding areas. Of particular interest again this morning is the very bright scintillating spot on the SPC perimeter nearing the CM on the 09:43 image; these images present the SPC overexposed in processing, but this very small and concentrated spot was well shown on Ed Grafton's image of July 17 on this same meridian (about 130 degrees)

 

Note also the reddish hue associated with the volcanic peaks in the Tharsis region; Olympus Mons and others are well shown in both images. As always these are taken with the ASO Petit Jean telescope, a Meade 16" SCT operating at f/35 and Toucam with Registax.

 


Dr Clay SHERROD (Arkansas Sky Observatory, AR, USA)

10 Observatory Hill Drive, Petit Jean

Harvard/MPC H43 (Conway)

Harvard/MPC H41 (Petit Jean Mountain)

drclay@arksky.org


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