Return to the Cloudy Nights Telescope Reviews home pageAstronomics discounts for Cloudy Nights members
· Get a Cloudy Nights T-Shirt · Submit a Review / Article

Click here if you are having trouble logging into the forums

Privacy Policy | Please read our Terms of Service | Signup and Troubleshooting FAQ | Problems? PM a Red or a Green Gu… uh, User

Astrophotography and Sketching >> Sketching

Pages: 1
moonzero2
member


Reged: 07/30/08

Loc: Elizabeth, Colorado
Mars Sketch - Feb 2, 2010
      #3652117 - 02/28/10 03:43 AM Attachment (39 downloads)

I just started sketching,... and I'm very new to astronomy,... and this was my 1st time observing Mars. This observation was done on February 2, 2010.

I used the Orion Mars filter, #82A blue filter, and a #21 orange filter. The blue filter really brought out the polar ice cap. The Orion Mars filter allowed me to see some surface detail using averted vision. The orange filter did not help much at all.

I think I may need to get a variable polarizing filter to cut down of some of the brightness. I'm thinking some of the surface details are being washed out by the brightness? Any opinions on this?

I used my Orion XT12i telescope, with an Orion 3.5mm Stratus eye piece giving me 428X. The seeing was very good, as viewing the moon was crystal clear!

I'm not sure how some of you get the details that you get. Got the columniation spot on using my Catseye tools.

Here is my sketch.


Post Extras: Print Post   Remind Me!   Notify Moderator  
mathteacher
Carpal Tunnel
*****

Reged: 05/13/07

Loc: Oakland, CA
Re: Mars Sketch - Feb 2, 2010 new [Re: moonzero2]
      #3652170 - 02/28/10 05:31 AM

That is an excellent first effort. I like the subtleness. I've never viewed Mars in a 12" scope, so I don't know if brightness is a problem. I think you will get better at seeing more detail with experience. You've gotten off to a great start. Saturn is coming into opposition soon!

Post Extras: Print Post   Remind Me!   Notify Moderator  
Jef De Wit
Carpal Tunnel


Reged: 03/06/09

Loc: Hove, Belgium
Re: Mars Sketch - Feb 2, 2010 new [Re: mathteacher]
      #3652177 - 02/28/10 05:39 AM

Bob, that's a very good Mars sketch.
I observe Mars like you with a 12" and I use an apodizing mask to cut down the brightness. It also helps to stabilize (bad) seeing. For me it works very well to see more detail on Mars. The mask is easy to build and cheap (http://csastro.org/2009/10/a-do-it-yourself-apodizing-mask/).


Post Extras: Print Post   Remind Me!   Notify Moderator  
frank5817
Postmaster
*****

Reged: 06/13/06

Loc: Illinois
Re: Mars Sketch - Feb 2, 2010 new [Re: Jef De Wit]
      #3652430 - 02/28/10 11:07 AM

Bob,

Welcome to the sketching forum and thank you for bringing us a gift. The sketch looks great. One polarizing filter can help reduce the brightness. Try putting on a pair of polarizing sunglasses.

Frank


Post Extras: Print Post   Remind Me!   Notify Moderator  
Tommy5
Carpal Tunnel


Reged: 03/28/04

Loc: Chicagoland
Re: Mars Sketch - Feb 2, 2010 new [Re: frank5817]
      #3652835 - 02/28/10 02:54 PM

Very nice Mars sketch at 400+ mag i don't think that brightness is a problem i would suggest a lower masg to get a sharper image,the atmosphere in my neighborhood seldom supports more then 300x regardless of the scope, you might also want to look at the Sky and Telescope wenbite, that have a mars profiler which shows what albedo features are currently visible, thanks for posting, great job again.

Post Extras: Print Post   Remind Me!   Notify Moderator  
moonzero2
member


Reged: 07/30/08

Loc: Elizabeth, Colorado
Re: Mars Sketch - Feb 2, 2010 new [Re: Tommy5]
      #3653393 - 02/28/10 08:32 PM

Thanks everyone!

Yea, I'm looking forward to Saturn and sketching it!

I'll have to make me an apodizing mask. Sounds like a great idea! Thanks Jef!

I never thought of lowering the magnification. I'll have to try that.


Post Extras: Print Post   Remind Me!   Notify Moderator  
CarlosEH
Postmaster
*****

Reged: 01/19/05

Loc: Pembroke Pines, Broward County...
Re: Mars Sketch - Feb 2, 2010 new [Re: moonzero2]
      #3653789 - 03/01/10 02:35 AM

Bob,

An excellent first observation of Mars. You have recorded what appears to be the North Polar Cap (NPC) and possibly Syrtis Major. You have received good advice above in that you should consider using a lower magnification while observing Mars. A sharp Moon may not be a good indicator of the steadiness of the atmospere (seeing). You may experience poor seeing with a sharp Moon. A large aperture Dobsonian, as you own, is very sensitive to seeing (atmospheric) conditions. I would try to keep the magnification below 300x if the image is fluctuating a little in the eyepiece field. The image will be smaller but sharper. I look forward to your future observations.

Carlos


Post Extras: Print Post   Remind Me!   Notify Moderator  
Pages: 1


Extra information
2 registered and 4 anonymous users are browsing this forum.

Moderator:  cildarith, JayinUT, WOBentley 

Print Thread

Forum Permissions
      You cannot start new topics
      You cannot reply to topics
      HTML is disabled
      UBBCode is enabled


Thread views: 811

Jump to

CN Forums Home


Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics