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Comet in HI1a - Encke ?

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  • alan
    Gidday All, Could this be Encke looking decidedly less bright than expected.? kind reagrds, Alan. Label Mean X Y Slice 1 201008:20100823_060901_s4h1A 53.6180
    Message 1 of 8 , Aug 25, 2010
      Gidday All,
      Could this be Encke looking decidedly less bright than expected.?
      kind reagrds, Alan.
      Label Mean X Y Slice
      1 201008:20100823_060901_s4h1A 53.6180 1017 725 10
      2 201008:20100823_104901_s4h1A 52.2389 1009 726 17
      3 201008:20100823_164901_s4h1A 50.6720 1001 728 26
      4 201008:20100823_232901_s4h1A 50.5201 992 729 36
    • Ian Musgrave & Peta O'Donohue
      G Day All ... I don t think so, according to my JPL coordinates for Encke, it never comes within spitting distance of the H1A imager field of view (I spent
      Message 2 of 8 , Aug 25, 2010
        G'Day All

        alan wrote:
        > Gidday All,
        > Could this be Encke looking decidedly less bright than expected.?
        > kind reagrds, Alan.
        > Label Mean X Y Slice
        > 1 201008:20100823_060901_s4h1A 53.6180 1017 725 10
        > 2 201008:20100823_104901_s4h1A 52.2389 1009 726 17
        > 3 201008:20100823_164901_s4h1A 50.6720 1001 728 26
        > 4 201008:20100823_232901_s4h1A 50.5201 992 729 36

        I don't think so, according to my JPL coordinates for Encke, it never
        comes within spitting distance of the H1A imager field of view (I spent
        some time a couple of weeks back plotting orbits to see if Encke would
        turn up in either H1A or H1B).

        Cheers! Ian
        =========================================
        Ian Musgrave, Peta ODonohue, Jack, Mikey and Andy
        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/
        Sky & Space http://www.skyandspace.com.au/public/home.ehtml
      • Alan Watson
        Gidday Ian, Much as I would like to agree with you and have this counted to me, I am quite sure it s Encke. My Starry night settings are a few days out. And I
        Message 3 of 8 , Aug 25, 2010
          Gidday Ian,
          Much as I would like to agree with you and have this counted to me, I am quite sure it's Encke.
          My Starry night settings are a few days out. And I would need the current set of orbital parameters to realign it(??)
          I have never worked out how convert the JPL data to Starry night correctly.
           
          kind regards, Alan

          On Thu, Aug 26, 2010 at 10:17 AM, Ian Musgrave & Peta O'Donohue <reynella@...> wrote:
           

          G'Day All



          alan wrote:
          > Gidday All,
          > Could this be Encke looking decidedly less bright than expected.?
          > kind reagrds, Alan.
          > Label Mean X Y Slice
          > 1 201008:20100823_060901_s4h1A 53.6180 1017 725 10
          > 2 201008:20100823_104901_s4h1A 52.2389 1009 726 17
          > 3 201008:20100823_164901_s4h1A 50.6720 1001 728 26
          > 4 201008:20100823_232901_s4h1A 50.5201 992 729 36

          I don't think so, according to my JPL coordinates for Encke, it never
          comes within spitting distance of the H1A imager field of view (I spent
          some time a couple of weeks back plotting orbits to see if Encke would
          turn up in either H1A or H1B).

          Cheers! Ian
          =========================================
          Ian Musgrave, Peta ODonohue, Jack, Mikey and Andy
          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/
          Sky & Space http://www.skyandspace.com.au/public/home.ehtml




          --
          Kind regards, Alan
        • Ian Musgrave & Peta O'Donohue
          G Day Alan ... No, a few days or so shouldn t matter, my SkyMap co-ordinates and Celestia files are on my other computer, so I can t give you more details at
          Message 4 of 8 , Aug 25, 2010
            G'Day Alan

            Alan Watson wrote:
            > Gidday Ian,
            > Much as I would like to agree with you and have this counted to me, I am
            > quite sure it's Encke.
            > My Starry night settings are a few days out. And I would need the current
            > set of orbital parameters to realign it(??)
            > I have never worked out how convert the JPL data to Starry night
            > correctly.

            No, a few days or so shouldn't matter, my SkyMap co-ordinates and Celestia
            files are on my other computer, so I can't give you more details at the
            moment, but I'll re-check when I get home tonight. My memory is that Encke
            stayed on the other side of the Sun from H1A until well into the future (I
            was bitterly disappointed).

            That said, I will double check. Encke is running at around magnitude 9-10
            at the moment from earth (dimmer than predicted).

            Cheers! Ian
            =========================================
            Ian Musgrave, Peta ODonohue, Jack, Mikey and Andy
            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/
            Sky & Space http://www.skyandspace.com.au/public/home.ehtml
          • Ian Musgrave & Peta O'Donohue
            G Day All I ve uploaded a file to the Files area
            Message 5 of 8 , Aug 26, 2010
              G'Day All

              I've uploaded a file to the Files area
              <http://f1.grp.yahoofs.com/v1/IDt2TK_mERutQ5TJpxhB8FVA3jZeJ6GeSyWYWnclm2xKj05yJfCgE98LADzZZGGP_On0qKJAMtLNdXqWJLK7pcj5r2SO0zA_LNON/Encke_StereoA_20-08-10.png>
              with the positions of Encke on 20 August 08 Hr UT and 20 Hr UT with
              the filed of view of Stereo H1A on 20 August 06 hr UT.

              This shows Encke outside the field of view of stereo, my Celestia
              simulation says just about the same thing (have to update the stereo
              orbit files).

              BUUUUTTT the location of your mover is just about where Encke *would*
              enter the FOV. So it *could* be Encke. Anybody got better orbital
              parameters than the JPL horizons data?

              Cheers! Ian
              At 09:55 AM 26/08/2010, you wrote:


              >Gidday Ian,
              >Much as I would like to agree with you and have this counted to me,
              >I am quite sure it's Encke.
              >My Starry night settings are a few days out. And I would need the
              >current set of orbital parameters to realign it(??)
              >I have never worked out how convert the JPL data to Starry night correctly.
              >
              >kind regards, Alan
              >
              >On Thu, Aug 26, 2010 at 10:17 AM, Ian Musgrave & Peta O'Donohue
              ><<mailto:reynella@...>reynella@...> wrote:
              >
              >
              >G'Day All
              >
              >
              >alan wrote:
              > > Gidday All,
              > > Could this be Encke looking decidedly less bright than expected.?
              > > kind reagrds, Alan.
              > > Label Mean X Y Slice
              > > 1 201008:20100823_060901_s4h1A 53.6180 1017 725 10
              > > 2 201008:20100823_104901_s4h1A 52.2389 1009 726 17
              > > 3 201008:20100823_164901_s4h1A 50.6720 1001 728 26
              > > 4 201008:20100823_232901_s4h1A 50.5201 992 729 36
              >
              >I don't think so, according to my JPL coordinates for Encke, it never
              >comes within spitting distance of the H1A imager field of view (I spent
              >some time a couple of weeks back plotting orbits to see if Encke would
              >turn up in either H1A or H1B).


              Cheers! Ian

              ======================================================
              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
            • Karl Battams
              Hi All, I don t have time to run the numbers right now but I think it almost certainly is Encke. I thought it would actually miss the HI-1 field of view,
              Message 6 of 8 , Aug 26, 2010
                Hi All,

                I don't have time to run the numbers right now but I think it almost certainly is Encke. I thought it would actually miss the HI-1 field of view, thinking it would be a little too "low", but apparently not. It will hit HI-2A in the near future, too, but that I did expect.

                One thing that makes me think it really is Encke: tail dynamics! Even though it's faint, I can see a short tail sticking out and it's wagging around like a happy dog! :) I'll post a movie tomorrow when we have a few more images for it. I would also concur with the mag9 or 10 figure -- that looks about right to me.

                The 'STEREO orbit viewer' helps a bit with the current viewing geometry: http://secchi.nrl.navy.mil/STEREOorbit/2PEncke.html

                Cheers,
                ~~Karl

                --- In stereohunter@yahoogroups.com, Ian Musgrave & Peta O'Donohue <reynella@...> wrote:
                >
                > G'Day All
                >
                > I've uploaded a file to the Files area
                > <http://f1.grp.yahoofs.com/v1/IDt2TK_mERutQ5TJpxhB8FVA3jZeJ6GeSyWYWnclm2xKj05yJfCgE98LADzZZGGP_On0qKJAMtLNdXqWJLK7pcj5r2SO0zA_LNON/Encke_StereoA_20-08-10.png>
                > with the positions of Encke on 20 August 08 Hr UT and 20 Hr UT with
                > the filed of view of Stereo H1A on 20 August 06 hr UT.
                >
                > This shows Encke outside the field of view of stereo, my Celestia
                > simulation says just about the same thing (have to update the stereo
                > orbit files).
                >
                > BUUUUTTT the location of your mover is just about where Encke *would*
                > enter the FOV. So it *could* be Encke. Anybody got better orbital
                > parameters than the JPL horizons data?
                >
                > Cheers! Ian
                > At 09:55 AM 26/08/2010, you wrote:
                >
                >
                > >Gidday Ian,
                > >Much as I would like to agree with you and have this counted to me,
                > >I am quite sure it's Encke.
                > >My Starry night settings are a few days out. And I would need the
                > >current set of orbital parameters to realign it(??)
                > >I have never worked out how convert the JPL data to Starry night correctly.
                > >
                > >kind regards, Alan
                > >
                > >On Thu, Aug 26, 2010 at 10:17 AM, Ian Musgrave & Peta O'Donohue
                > ><<mailto:reynella@...>reynella@...> wrote:
                > >
                > >
                > >G'Day All
                > >
                > >
                > >alan wrote:
                > > > Gidday All,
                > > > Could this be Encke looking decidedly less bright than expected.?
                > > > kind reagrds, Alan.
                > > > Label Mean X Y Slice
                > > > 1 201008:20100823_060901_s4h1A 53.6180 1017 725 10
                > > > 2 201008:20100823_104901_s4h1A 52.2389 1009 726 17
                > > > 3 201008:20100823_164901_s4h1A 50.6720 1001 728 26
                > > > 4 201008:20100823_232901_s4h1A 50.5201 992 729 36
                > >
                > >I don't think so, according to my JPL coordinates for Encke, it never
                > >comes within spitting distance of the H1A imager field of view (I spent
                > >some time a couple of weeks back plotting orbits to see if Encke would
                > >turn up in either H1A or H1B).
                >
                >
                > Cheers! Ian
                >
                > ======================================================
                > 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
                >
              • rainerkracht
                No doubt, this is 2P/Encke. The DATE-AVG for image 1 is 2010-08-23 06:23:51 JPL HORIZONS has 15h 23m 04.40s -22d 57 08.3 for 2P as observed from STEREO-A and
                Message 7 of 8 , Aug 26, 2010
                  No doubt, this is 2P/Encke.

                  The DATE-AVG for image 1 is 2010-08-23 06:23:51
                  JPL HORIZONS has 15h 23m 04.40s -22d 57' 08.3"
                  for 2P as observed from STEREO-A and there it is.

                  The bright star not far from 2P towards the upper left is RS Librae.

                  Regards, Rainer

                  --- In stereohunter@yahoogroups.com, "alan" <c2009a1@...> wrote:
                  >
                  > Gidday All,
                  > Could this be Encke looking decidedly less bright than expected.?
                  > kind reagrds, Alan.
                  > Label Mean X Y Slice
                  > 1 201008:20100823_060901_s4h1A 53.6180 1017 725 10
                  > 2 201008:20100823_104901_s4h1A 52.2389 1009 726 17
                  > 3 201008:20100823_164901_s4h1A 50.6720 1001 728 26
                  > 4 201008:20100823_232901_s4h1A 50.5201 992 729 36
                  >
                • Ian Musgrave & Peta O'Donohue
                  G Day All ... Wait, what? [insert swear words] I was using the data for the 20th, having read Alan s ID s incorrectly. [rechecks data, bangs head on desk]
                  Message 8 of 8 , Aug 26, 2010
                    G'Day All

                    At 10:04 PM 26/08/2010, you wrote:

                    >No doubt, this is 2P/Encke.
                    >
                    >The DATE-AVG for image 1 is 2010-08-23 06:23:51
                    >JPL HORIZONS has 15h 23m 04.40s -22d 57' 08.3"
                    >for 2P as observed from STEREO-A and there it is.

                    Wait, what? [insert swear words] I was using the data for the 20th,
                    having read Alan's ID's incorrectly.
                    [rechecks data, bangs head on desk] Look, just forget I said anything.

                    PS Alan, are were going to draw straws for who gets to use GRAS to
                    image Encke and the Sombreo galaxy (in the vain hope that it's not
                    pouring rain).


                    >The bright star not far from 2P towards the upper left is RS Librae.


                    Embarrassed, Ian

                    ======================================================
                    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
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