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Trying for Rima Sharp


Nik271
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Has anyone observed Rima Sharp with a modest aperture (e.g. 5 inches or less)?

I have tried a couple of times in what I thought is the right moon phase but the seeing was not cooperative.

I've heard it's not an easy one, certainly does not get many observing reports.

Tonight it should be right on the terminator, this is the simulation at 20:00 UT. It may be even more prominent a few hours later.

 

Inkedcomp.1749_LI.jpg.86287d5580603943f41d64ffd0b2287d.jpg

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I tried last night with Skymax 127 at about 9pm, the seeing was not the best but decent, I could see some faint details like Rima Prinz, but sadly no sign of Rima Sharp even when looking directly at the spot where its supposed to be.  Either its too small for 5 inches aperture or the sun angle was not right.

Aristarchus region looked very nice, with vallis Schroteri partially illiminated with deep shadows all round. 

I will try again this evening if the clouds cooperate. Sinus Roris will be fully in the sun and the elusive Rima Sharp may be easier to spot.

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  • 5 weeks later...

I tried last night (Apr 14) in decent seeing with the terminator close by but saw nothing in the 81/2'' Newt. The seeing could have been better and the collimation was slightly off which didn't help but it seems a tough one.  David

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Posted (edited)

I also looked at the same night with no success. Surpising how hard it is considering it is showing big on most charts, even those from pre-satellite mapping era e.g:

72dpi.jpg

I will keep trying around the 11-12 day of the Moon cycle.

Edited by Nik271
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  • 4 weeks later...

In spite of the breeze the seeing was helpful earlier tonight and I just spotted Rima Sharp fleetingly in the 8'5'' Dob. At least the lower two thirds of the Rille between the two headlands so I'm pleased with that. The terminator was well off to the West so an earlier moon might show it better.

Further East was the dome Gruithuisen gamma but I looked in vain for the summit craterlet.

David

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That's awesome! I was looking too around 10pm but the seeing was poor, on top of that I had only my 127mm Mak available, so I just kept to low power Moon views, which were very pleasing.

Edited by Nik271
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