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[UX Issue]* Jupiter's GRS Is In The Wrong Position

Hi there, something I've noticed recently is that the position of the GRS is slightly off in SkySafari 6 (I use the Plus edition). Is is possible to update the details for Jupiter to have this location more accurate?

Thanks, Andrew

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11 comments

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    Keiron Smith Official comment

    DevOps reference: https://starrynight.unfuddle.com/a#/projects/7965/tickets/by_number/674

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    StuartTMDavis

    I’ve noticed this too, as have a few other s I know who use Skysafari 6 Pro. Could we have an update on whether it is possible to update/correct GRS position? It has usually been correct for me in the past, so I assume it does get updated somehow?

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    Keiron Smith

    1. Make sure you have Light Time enabled in the "Precession" settings (this is the default).  If you have it off then we will show what it looks like if light is infinitely fast.  This will cause events to be reported too soon.

    2. When you have the time set to NOW (or Realtime), does the chart's time match what you expect?  If not, we need to figure that out.

    3. Make sure your location is on Earth.  If you are orbiting some other object (say Mars) then all times will be from that location.

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    StuartTMDavis

    Hi,

    I’ve checked all those things and all are correctly set, time is right when I tap Now.

    I’ve noticed that the predicted GRS transit time does not match that of certain other resources out there which are proving to be correct.

    How, and how often is the GRS location update as it does drift over time.

    Thanks

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    Andrew Amiet

    Yep, checked all those things too. Here is an example of an image I took at the same time as SkySafari, showing the difference.

     

    Andrew

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    Chris

    Wow, amazing picture. SkySafari should adopt it for their software, with your permission of course! :)

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    StuartTMDavis

    Andrew, that looks to be exactly the sort of difference I was seeing. Nice shot!

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    Andrew Amiet

    Thanks, there are better images out there, and I haven't got images from all 360 degrees. SkySafari is using an old image (which is fine), but the positions of the GRS, Oval BA etc drift with time. Here's a cool animation over 7 days showing the GRS and Oval BA approaching each other (courtesy Darren aka DMach).

    https://www.cloudynights.com/topic/724279-jupiter-2020-08-15-oval-ba-approaching-the-grs-with-7-day-comparison/?p=10433270

     

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    Ade Ashford

    The current longitude of the GRS (based on observation) can always be found here: http://jupos.privat.t-online.de/img/Grs.GIF

    I agree, the value for the GRS longitude used in Sky Safari 6 Pro for iOS and Android is in error.

    As of mid-August 2020 the GRS longitude was about 340 degrees. Allowing for drift, that means that today (21 Sept. 2020 ) it should be around 341 degrees.

    For example, Sky Safari 6 Pro (both iOS and Android) predicts a GRS transit on 20 September 2020 at 23:14 UT; it actually transited at 23:47 UT.

    Clear skies, Ade

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    Andrew Amiet

    OK, now that it's been fairly well established that the position of the GRS is not accurately reflected in the app, can this be fixed please? I'm not talking about an entirely new 360 degree image of Jupiter (since it changes daily) but just to update the longitude of the GRS in SkySafari's database would be great.

    Is this not easy to fix?

    Thanks, Andrew

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    Ros Hartigan

    Hi Andrew, a fix will be out shortly. It is already available in beta for Android if you would like to try the beta version.

    Thanks,

    Ros

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