Jump to content


Mars 04/08

This topic has been archived. This means that you cannot reply to this topic.
6 replies to this topic

#1 Kris.


    Surveyor 1

  • *****
  • Posts: 1764
  • Joined: 16 Sep 2004

Posted 06 August 2009 - 09:42 AM

Here’s a quick sketch of mars from two days ago, i had both my 8” and 12” scopes set up, to see how they would perform. Unfortunately the seeing was poor to very poor, so i don’t think it’s fair to judge the performance right now.

First thing i noticed was that the contrast between dark and lighter areas on mars is actually even fainter, makes sense i suppose because the 12” gathers twice as much light then the 8”.
In these bad seeing conditions, i could not see more detail on mars with the 12” then in the 8”, so i’ll have to wait for a real comparison!

Very little detail visible on the disk, the few things that i could see were sinus sabaeus and syrtis major on the preceding limb. Also south of sinus sabaeus there was a streak visible, i guess it’s either Noachis or Hellespontus, (i think Carlos will provide the right answer ;) )

Posted Image

#2 frank5817



  • *****
  • Posts: 8637
  • Joined: 13 Jun 2006

Posted 06 August 2009 - 10:21 AM


Very impressive sketch. Considering your poor seeing conditions you did very well. :cool: :bow:

Frank :)

#3 rolandlinda3



  • *****
  • Posts: 3434
  • Joined: 24 Jan 2006

Posted 06 August 2009 - 04:41 PM

Your results don't surprise me. The aperture gain will be more noticeable on deep sky objects or details on the moon where the objective area fills the field of view. Planets will show a more modest increase in detail (at least that is what happens to me) but the color is enhanced (function of light gathering that reaches your eye). Have fun. Using the Denks??

#4 Special Ed

Special Ed

    Fly Me to the Moon

  • *****
  • Posts: 7138
  • Joined: 18 May 2003

Posted 07 August 2009 - 08:25 AM


Nice sketch of your eyepiece view. :) I think the dusky albedo south of Sabbaeus Sinus is Hellespontus.

#5 Kris.


    Surveyor 1

  • *****
  • Posts: 1764
  • Joined: 16 Sep 2004

Posted 07 August 2009 - 09:25 AM

Frank, Roland & Michael: thanks for the nice comments.

Roland, it's good you ask, perhaps you can help me, i'm having some troubles using the denks on small object (= Mars :help:) see this link where i posted my question. (down at the bottom)

#6 Tommy5



  • -----
  • Posts: 2814
  • Joined: 28 Mar 2004

Posted 07 August 2009 - 12:59 PM

Very nice sketch of Mars, nice detail for such a tiny object.

#7 rodelaet



  • *****
  • Posts: 3185
  • Joined: 28 Apr 2006

Posted 12 August 2009 - 02:46 PM

Beautiful sketch, Kris!

I'm impressed with the details on that tiny disk.
You made a good start for the coming opposition.

CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.

Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics