Jump to content


Comet C/2013 A1 Siding Spring Close Encounter with Mars

  • Please log in to reply
2 replies to this topic

#1 dcrowson


    Advanced Member

  • Members
  • PipPipPip
  • 501 posts

Posted 20 October 2014 - 08:41 PM

On October 19th, 2014, Comet C/2013 A1 Siding Spring passed Mars at a distance of 132,000 km, roughly 1/3 of the distance between the Earth and the moon. While it was cloudy here on the 19th, the day before and after still gave us a chance to catch an image. This was a challenge because the image was taken between 15 and 10 degrees above the horizon.


Luminance – 12x75s – 15 minutes – binned 1x1

RGB – 3x75s – 3.75 minutes each – binned 2x2


18.75 minutes total exposure


Imaged October 18th, 2014 at the Danville Conservation Area (New Florence, Missouri) with a SBIG ST-8300M on an Astro-Tech AT90EDT at f/6.7 603mm. This data was acquired by Dan Crowson (https://www.flickr.c...hotos/dcrowson/) and processing by Gregg Ruppel.


LRGB Composite - https://www.flickr.c...0729600/sizes/l





  • Neil and tich like this

#2 woolbrig


    Advanced Member

  • Members
  • PipPipPip
  • 365 posts
  • LocationBethalto, IL

Posted 21 October 2014 - 12:31 AM

Great shot!  That's really cool!

  • Neil likes this



Scopes: Celestron C9.25/Hyperstar, SkyWatcher 80ED Pro, WO Star-71 II Mounts: CGEM (Hypertuned), CG5  Guiding: Orion SSAG/ST80/Mini 50, OAG  Cameras: ASI120MC, ASI174MM, ASI224MC, Canon T3i (Baader Mod), QHY10, QHY23


#3 Neil



  • Administrators
  • 1,493 posts
  • LocationThe Netherlands

Posted 21 October 2014 - 12:40 PM

Wow... that's a really nice shot, these are once in a life time images.


Excellent work Dan.


Will this be visible from our area of the world? Sounds like its was very low for you in the USA.


Clear Skies




Thank you for your interest in our Astronomy Forum...
It looks like you haven't joined us yet?
Why don't you register to get all the features of being a member! Its free!