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2012QG42- how accurate is Stellarium?

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#1 John Wunderlin

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Posted 08 September 2012 - 12:17 AM

Hi everyone. For fun tonight I decided to image 2012QG42. I found that Stellarium's position was off by nearly 1/3 of a degree- is this typical, or do I need to check my settings? My clock is auto-set but maybe my location is not entered closely enough? Thanks in advance.

#2 coylandry

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Posted 09 September 2012 - 10:26 PM

Where are you seeing the asteroid at?, I've been looking for it myself, light pollution is horrible where I'm at though

#3 WillCarney

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Posted 10 September 2012 - 08:59 AM

Don't know about Stllarium but Cartes du Ciel was on the money. Make sure your location and time are correct. Make sure your time is refreshed. Close approach asteroids can be in different parts of the sky for people even one state away.
William

#4 *skyguy*

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Posted 10 September 2012 - 09:29 AM

For very, very close asteroids, parallax can become significant problem for many (if not all) planetarium programs when determining an object's position.

In the past ... for objects like 2012 QG42 ... I've often had to search +/- 20 arcminutes along it's predicted path to locate the object.

Good Hunting ...

Jim

#5 John Wunderlin

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Posted 10 September 2012 - 10:00 AM

Thanks, Jim I was thinking about that as well. Do you happen to know if Stellarium is supposed to take that into account? It would be nice if I could identify the problem.

#6 WillCarney

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Posted 11 September 2012 - 08:55 AM

You should be able to set your observatory location. Once set to your proper time and location the program will compute it's proper position in the sky.

William

#7 John Wunderlin

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Posted 11 September 2012 - 10:20 AM

I thought I had everything defined properly, but I've had some trouble with this computer before so I'll double check. Thanks.

#8 *skyguy*

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Posted 11 September 2012 - 12:20 PM

Thanks, Jim I was thinking about that as well. Do you happen to know if Stellarium is supposed to take that into account? It would be nice if I could identify the problem.


When I checked the asteroid's position in both Stellarium and TheSky6 ... the difference in RA was within 3 arcminutes and the Dec under 1 minute. Not really significant.

We had some club members out at the club observatory imaging 2012 QG42 last night. They had a hard time finding it because it was pretty far off its predicted position. Not surprising ...

#9 WillCarney

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Posted 12 September 2012 - 10:27 AM

I imaged it briefly several times over the last few days.
Using Cartes du Ciel to control an Atlas or CGEM it was
always right on the money. Centered exactly on target.

William

#10 John Wunderlin

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Posted 12 September 2012 - 10:29 AM

Thanks for the update. I'm going to try to reproduce the position from my last data since it looks cloudy for a while here. It would be really nice to have it closer than what I saw.






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