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Two Recent Mars Observations

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#1 Special Ed

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Posted 04 July 2020 - 04:07 PM

Hi,

I took advantage of decent morning seeing Thursday and Friday to make these two observational sketches.  The edge of the South Polar Cap (SPC) is very irregular and a dusky rift can be seen in the cap.  I've found the rift is best seen during late twilight or even after sunrise when the contrast effect is lessened.  A morning limb arc was present in both observations.  The dominant feature on the central meridian in both sketches is the classic albedo feature Mare Cimmerium.

 

2020-07-02-0930-MR-CM196.jpg

 

2020-07-03-1010-MR-196.jpg


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#2 Shorty Barlow

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Posted 04 July 2020 - 04:25 PM

Interesting. I saw Mars with my Evostar 80ED at 200x (3mm DeLite) in June and I could definitely see a yellow orange feature in the southern polar cap. This wasn't there a couple of days previously. I wondered if it was dusty clouds.



#3 Dean Norris

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Posted 04 July 2020 - 04:45 PM

Michael,

 

Very good sketches of Mars. I see you had 2 days in a row! I'm glad you're getting these observations. It's interesting that the rift on the SPC is best seen as the sky lightens.

 

Have you compared the Magenta filter to a Moon Sky-Glow? I don't have a magenta filter. I like the MSG as well as #21 orange,#80 blue. I've looked into the magenta finding it's only available in 1.25". I was hoping to get a 2" magenta but have not found any.

 

Dean



#4 Special Ed

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Posted 04 July 2020 - 08:44 PM

@ Shorty--it's very possible you saw dust over the cap.  Now the cap is receding and rifts are showing because it's spring there.

 

@ Dean--thanks!  I have heard good things about how the MSG filter improves contrast although I don't own one myself.  All the old veteran Mars observers like to use a magenta filter (as well as red, orange, blue, and green filters) to enhance various features on the surface and in the atmosphere.  I have the Vernon W30 filter which only screws into Vernon ep's so I had to purchase an adapter in order to use it.

 

The SPC is so brilliant that I think the loss of contrast and decrease in irradiation that happens as the sky brightens assists in seeing the SPC rifts.



#5 Shorty Barlow

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Posted 04 July 2020 - 10:05 PM

@ Shorty--it's very possible you saw dust over the cap.  Now the cap is receding and rifts are showing because it's spring there.

 

 

Let's hope the dust doesn't turn into a storm lol!



#6 SStoffer

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Posted 05 July 2020 - 04:03 AM

Just finished looking at Mars at 132X in my 4 inch refractor. I knew I was looking at a polar cap! This post confirms it. 




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