Jump to content


Photo

Vallis Alpes and Cassini

  • Please log in to reply
30 replies to this topic

#26 azure1961p

azure1961p

    Voyager 1

  • *****
  • Posts: 10276
  • Joined: 17 Jan 2009
  • Loc: USA

Posted 22 February 2013 - 09:32 AM

Beautiful image - the rille has gotten some fair if challenging exposure in this thread.

Pete

#27 photonovore

photonovore

    Moonatic

  • *****
  • Posts: 2857
  • Joined: 24 Dec 2004
  • Loc: tacoma wa

Posted 22 February 2013 - 09:49 AM

More "hint of a rille" with a 5" achromat...

Posted Image

I have also seen this rille captured with a 4"apo as well (Ron Bee?). It was also well known during the visual era, recorded (albeit always very inaccurately) by observers using the smaller (6inch) achromats popular in that era (late 19th century). the larger portions are ~600-700m width so what is really needed is good seeing (~1"ac) and an optimal sun angle.

#28 nirvanix

nirvanix

    Surveyor 1

  • -----
  • Posts: 1744
  • Joined: 07 Jun 2007
  • Loc: Saskatoon, SK

Posted 22 February 2013 - 11:02 AM

Thanks highfnum and photonovore (feel like I'm speaking to the Vendecar high council or something :grin:) for the info.

Requiring simultaneously good seeing and the right sun angle does make it a challenge indeed. The rille and Plato craterlets are fun things to do on the moon. I found I got a better craterlet count two days after getting a glance at the rille. Will try again next month if the cloud lords can bugger off.

#29 RobDob

RobDob

    Messenger

  • -----
  • Posts: 491
  • Joined: 10 Apr 2010
  • Loc: Brentwood (East Bay Area), CA

Posted 22 February 2013 - 08:21 PM

Thanks Highfnum and Mardi for the great pics! I have new hope for cracking the alpine cleft :photo:.

Rob

#30 RobDob

RobDob

    Messenger

  • -----
  • Posts: 491
  • Joined: 10 Apr 2010
  • Loc: Brentwood (East Bay Area), CA

Posted 22 February 2013 - 08:38 PM

Yeah, Nirvanix - Hopefully next month will bring us warmer spring like conditions and better seeing for rille gravy!

#31 RobertED

RobertED

    Gemini

  • *****
  • Posts: 3198
  • Joined: 11 Jul 2003
  • Loc: Smithfield, RI

Posted 15 March 2013 - 10:57 AM

All are awesome photos!!






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics