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Thread started 08 Feb 2017 (Wednesday) 18:36
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The Comet Cometh- Any Tips?

 
CatchingUp
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Feb 08, 2017 18:36 |  #1

I'm comfortable shooting milky way shots and meteor showers. But not sure exactly how to capture this if at all possible. Any suggestions?


Comet 45P

A few hours after the eclipse, Comet 45P, which has been visible after sunset for the past two months through binoculars and telescopes, makes its closest approach to Earth, when it will be "only" 7.4 million miles away, NASA said.

Look to the east around 3 a.m. Saturday morning, where it will be visible in the sky in the constellation Hercules. Binoculars or a telescope could be helpful. Watch for a bright blue-green "head" with a tail.

It will be visible in various points of the night sky until the end of February,


Tony
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TCampbell
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Feb 09, 2017 00:09 |  #2

This is set up for the early morning hours on Feb 11th (when it makes it's closest approach).

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The challenges are

(1) even though it's at it's closest, it's still a "faint fuzzy" and will need time-exposures to capture anything.

(2) the moon WILL be up the entire time the comet is visible AND the moon will be "full" (99.77% disk illumination -- that's pretty full!) That definitely wont be helping.

(3) it doesn't move at "sidereal" speed (the same speed as the background sky appears to move -- really based on the angular rate of Earth's rotation). You can see where it is in the above image (but but it will start a little lower in Hercules earlier in the night (the green line shows it's apparent path across the sky over a 6 hour period... of course the sky moves with it so Hercules would also have been down low near the horizon at around 12:30am when i started the plot). But it will move against the background stars enough that if you try to track at sidereal speed the head of the comet will be severely elongated and not a fuzzy point.

This means that normal tracking methods (a typical tracking head) wont work. Some go-to telescopes allow for customizable tracking rates. I have special software for my LX200 that can track custom objects at custom rates (I can even track satellites as they pass) but I'd probably venture to say that "most" go to telescope mounts don't actually offer custom tracking rates (programmable to any speed -- usually they let you pick from among several preset speeds.) This makes tracking difficult if you don't already happen to own the right equipment.

Here's another simulated view, but this one taken from an imaginary point in space with the position and orbital path of the comet (in blue) and the positions and orbits of the inner "rocky" planets (Mars, Earth, Venus, & Mercury) to give you an idea of where it is in the solar system (also generated by Starry Night).


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I should mention that the most recent photos I've seen of the object are showing the fuzzy head but not really showing a "tail". Here's an article showing the comet photographed on Feb 7 (2 days ago) and again on Feb 8 (yesterday) and neither show a tail. Images taken about 2 months back show a gorgeous tail.



  
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CatchingUp
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Feb 09, 2017 08:03 as a reply to  @ TCampbell's post |  #3

Thanks for that.....I had no idea where to even start on something like this. I appreciate all the info you provided here.


Tony
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MalVeauX
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Post edited over 6 years ago by MalVeauX.
     
Feb 09, 2017 08:07 |  #4

Heya,

You don't need a special tracker, guider, etc. Its' all about method & processing.

This guy explains how he does it and he's one of the best:

http://www.astrobin.co​m/151422/None/ (external link)

Personally with a full moon up and having to be up an running in the morning for best odds for me, I'd rather just visual it than try to image it.

Very best,


My Flickr (external link) :: My Astrobin (external link)

  
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Celestron
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Post edited over 6 years ago by Celestron. (2 edits in all)
     
Feb 09, 2017 08:37 |  #5

CatchingUp wrote in post #18268225 (external link)
I'm comfortable shooting milky way shots and meteor showers. But not sure exactly how to capture this if at all possible. Any suggestions?


Comet 45P

A few hours after the eclipse, Comet 45P, which has been visible after sunset for the past two months through binoculars and telescopes, makes its closest approach to Earth, when it will be "only" 7.4 million miles away, NASA said.

Look to the east around 3 a.m. Saturday morning, where it will be visible in the sky in the constellation Hercules. Binoculars or a telescope could be helpful. Watch for a bright blue-green "head" with a tail.

It will be visible in various points of the night sky until the end of February,

If your comfortable shooting meteor showers and milkyway images you should have no problems shooting the comet . Trial and error makes some of the best images . Doesn't need to be complicated whatsoever . As I always mention besure take some binocs and look at the comet in the sky also . Makes it worth while being out and observing . If your over technical disappointment and the loss of interest can happen quickly if your not careful .




  
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Pagman
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Feb 10, 2017 18:05 |  #6

Will it be visible/shootable with a 300mm lens on a Nikon crop cam?


P.




  
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TCampbell
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Feb 11, 2017 01:12 as a reply to  @ MalVeauX's post |  #7

Mal, he is using a telescope mount. He lists his equipment and says he used a TeleVue TV-85 (an f/7 apochromatic refractor with a 600mm focal length) and a 10 Micron GM1000HPS equatorial mount.

He also indicates he was shooting 4 minutes subs. At 600mm they'd be horribly smeared if he didn't have the equatorial mount tracking.




  
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The Comet Cometh- Any Tips?
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