Loading ...
Sorry, an error occurred while loading the content.

Re: Plot 2012 DA14's HORIZONS track in SkyMap

Expand Messages
  • ad371@xtra.co.nz
    No worries. Glad the positions are correct now. I guess from my view during it s inbound the error was only small and easily within the camera frame. Twilight
    Message 1 of 28 , Feb 16, 2013
    • 0 Attachment
      No worries. Glad the positions are correct now. I guess from my view during it's inbound the error was only small and easily within the camera frame. Twilight encroached just as it started to speed up, closest approach was a few hours after sunrise for us.

      --- In skymap@yahoogroups.com, "teerad" <teerad@...> wrote:
      >
      > Disgard it I forgot you were in New Zealand!
      >
      > --- In skymap@yahoogroups.com, "teerad" <teerad@> wrote:
      > >
      > > Is it a joke the photo in the file? The position and the date are not possible.
      > >
      > > --- In skymap@yahoogroups.com, "teerad" <teerad@> wrote:
      > > >
      > > > Hi Andrew,
      > > >
      > > > Nice application and it could be useful for other events! The latest Horizons version 1.4 using J2000 seems good and it makes a big difference of 4° between tracks for a given time generated with 1.2.1. That is as you said surely due to the apparent correction applied twice. I had some doubts when compared to heavens chart.
      > > >
      > > > I observed the asteroid from 20:45UT to 21:20UT. Using C6 F6.3 25mm plossl giving a field of 1,3°. I spot it because I planned to catch it when it crossed near Beta Canes Venatici and it moved quite fast, you can see move it in real time! At this time, it moved something like a moom diameter per minute. 30 minutes later, it alreayd fainted a bit and slowed down.
      > > >
      > > > This morning I compared my records to the skymap overlay generated with Horizons v1.4.1 seems very accurate.
      > > >
      > > > Regards,
      > > > Eric
      > > >
      > > > --- In skymap@yahoogroups.com, "ad371@" <ad371@> wrote:
      > > > >
      > > > > Hi Ian,
      > > > >
      > > > > I managed to get some pics just as clouds cleared near twilight. I see that I should have set the program to download Astrometric RA/Dec coords rather than Apparent RA/Dec, since SkyMap makes the necessary corrections to show the apparent position. Everything was offset by about 5-10 arc minutes. So that's been fixed in v1.4 just uploaded. Now, the position is virtually spot-on for this when compared to the photo, and when compared to other planets and comets in SkyMap.
      > > > > I tried with binoculars also but couldn't see it (just satellites). The photo is uploaded into the exe folder as well.
      > > > >
      > > > > Andrew
      > > > >
      > > > > --- In skymap@yahoogroups.com, "Ian Musgrave & Peta O'Donohue" <reynella@> wrote:
      > > > > >
      > > > > > G'Day All
      > > > > >
      > > > > > Andrew, got it using the remote iTelescope, and may have seen it with
      > > > > > binoculars (lots of cloud and the binoc object looked a little too bright,
      > > > > > but was very close to the predicted track and time)
      > > > > >
      > > > > > Many thanks again. Will pst pictures later.
      > > > > > Cheers! Ian
      > > > > > ad371@ wrote:
      > > > > > > Hi Ian,
      > > > > > >
      > > > > > > Give the new version a spin, check the readme for instructions installing
      > > > > > > it as an 'Add-In' for SkyMap. This way you can fire it up with the active
      > > > > > > map location and date/time (otherwise, it uses the Home location).
      > > > > > >
      > > > > > > Not long to go now. Weather prospects aren't looking too great for me,
      > > > > > > maybe between the clouds....
      > > > > > >
      > > > > > > Andrew
      > > > > > >
      > > > > > > --- In skymap@yahoogroups.com, Ian Musgrave & Peta O'Donohue wrote:
      > > > > > >>
      > > > > > >> G'Day All
      > > > > > >>
      > > > > > >> Brilliant!!!! Works beautifully.
      > > > > > >>
      > > > > > >> Now if you could only change the location :-) (it
      > > > > > >> give the output for my home location nicely, but
      > > > > > >> I do my serious imaging with a remote telescope
      > > > > > >> at Siding Spring observatory, if we could
      > > > > > >> generate tracks for more than just home that
      > > > > > >> would be nice :-) :-)... this is not to detract from your app, it is
      > > > > > >> brilliant)
      > > > > > >>
      > > > > > >> Cheers! Ian
      > > > > > >> At 04:55 AM 14/02/2013, you wrote:
      > > > > > >> >
      > > > > > >> >
      > > > > > >> >Hi folks,
      > > > > > >> >
      > > > > > >> >Have been following the discussion recently
      > > > > > >> >about the accuracy of asteroid orbit tracks in
      > > > > > >> >SkyMap, especially in the case in a couple of
      > > > > > >> >days of 2012 DA14 where Earth's gravity changes
      > > > > > >> >the orbit fast. I started playing with the JPL
      > > > > > >> >HORIZONS online system and wrote a Windows
      > > > > > >> >utility to (hopefully) make it relatively easy
      > > > > > >> >to generate tracks as map overlays using the
      > > > > > >> >positions calculated by HORIZONS. It uses the
      > > > > > >> >Telnet or Email interfaces to do this. These
      > > > > > >> >should be topocentric positions for your location (as set in SkyMap).
      > > > > > >> >
      > > > > > >> >Of course it can be used for other objects also,
      > > > > > >> >so may be of interest generally.
      > > > > > >> >
      > > > > > >> >The horizons_track.exe and readme.txt are in the
      > > > > > >> >Files section under the HORIZONS_Track Utility folder.
      > > > > > >> >
      > > > > > >> >Hope it's of use.
      > > > > > >> >
      > > > > > >> >Andrew
      > > > > > >> >
      > > > > > >> >
      > > > > > >>
      > > > > > >> ======================================================
      > > > > > >> Ian Musgrave Peta O'Donohue, Jack Francis,
      > > > > > >> Michael James and Andrew Thomas Musgrave
      > > > > > >> reynella@ http://home.mira.net/~reynella/
      > > > > > >> Southern Sky Watch
      > > > > > >> http://www.abc.net.au/science/space/default.htm (scroll down right hand
      > > > > > >> menu)
      > > > > > >> AstroBlogg http://astroblogger.blogspot.com/
      > > > > > >> Contributing Editor, Sky & Space
      > > > > > >> http://www.skyandspace.com.au/public/home.ehtml
      > > > > > >>
      > > > > > >
      > > > > > >
      > > > > > >
      > > > > >
      > > > >
      > > >
      > >
      >
    Your message has been successfully submitted and would be delivered to recipients shortly.