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Possible March 10 observation of C/.2012 E2 (SWAN)

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  • terryjlovejoy
    After the the release of the new orbit for C/2012 E2 (SWAN) in MPEC 2012-F02 I went back and reprocessed my images from March 10 and to my suprise found a very
    Message 1 of 4 , Mar 17 3:25 AM
      After the the release of the new orbit for C/2012 E2 (SWAN) in MPEC 2012-F02 I went back and reprocessed my images from March 10 and to my suprise found a very slightly extended starlike object in correct position and correct brightness. Here is a final stacked image consisting of 72 x 3.2 second frames with the suspect circled (The circle is 15' diameter for scale):

      http://tinyurl.com/7ryxbme

      This was a crop rescaled 2x from the original image made with a 350D + 135mm f3.5 lens mounted on a tripod. Keep in mind the comet suspect was just 4 degrees from the horizon at nautical twilight (sun at -12 degrees alititude) and was at just 17 degrees elongation. It required very agressive gradient correction and is without doubt one the hardest observations I've had to make.

      I also created 3 subframes of 24 frames each and the object is visible consistently in each and measurements in astrometrica are as follows:

      CK12E020 C2012 03 10.37527 00 30 43 -07 12 13 9.2 N E27
      CK12E020 C2012 03 10.37632 00 30 44 -07 12 15 9.2 N E27
      CK12E020 C2012 03 10.37736 00 30 44 -07 12 16 9.2 N E27

      The measurement error is problably no better than +/- 15 arcsecs especially given the low altitude.

      Terry
    • Michal Kusiak
      Dear Terry, I can confirm your ground based observations! Including your positions to my SOHO and STEREO measurements I found this orbit solution. Astrometry:
      Message 2 of 4 , Mar 17 3:45 AM
        Dear Terry,

        I can confirm your ground based observations!
        Including your positions to my SOHO and STEREO measurements I found this orbit solution.


        Astrometry:
        CK12E020 C2012 03 10.37527 00 30 43 -07 12 13 9.2 N E27
        CK12E020 C2012 03 10.37632 00 30 44 -07 12 15 9.2 N E27
        CK12E020 C2012 03 10.37736 00 30 44 -07 12 16 9.2 N E27
        CK12E020 S2012 03 11.60037 14 45 06.22 -25 57 58.9 C50
        CK12E020 s2012 03 11.60037 2 +1.597019000+0.613485923+0.271567223 C50
        CK12E020 S2012 03 11.65593 14 46 00.07 -25 54 05.7 C50
        CK12E020 s2012 03 11.65593 2 +1.596397334+0.614850247+0.272165010 C50
        CK12E020 S2012 03 11.68370 14 46 25.16 -25 51 59.7 C50
        CK12E020 s2012 03 11.68370 2 +1.596085869+0.615532126+0.272456264 C50
        CK12E020 S2012 03 11.71148 14 46 51.32 -25 49 56.4 C50
        CK12E020 s2012 03 11.71148 2 +1.595773762+0.616213900+0.272752331 C50
        CK12E020 S2012 03 11.98926 14 51 12.28 -25 30 26.9 C50
        CK12E020 s2012 03 11.98926 2 +1.592635967+0.623025341+0.275710441 C50
        CK12E020 S2012 03 13.31269 00 08 43.28 -04 16 43.0 6.70V 249
        CK12E020 s2012 03 13.31269 1 +1212824.88 -664668.024 -240100.507 249
        CK12E020 S2012 03 13.33092 00 08 34.84 -04 14 45.6 x 6.70V 249
        CK12E020 s2012 03 13.33092 1 +1213024.04 -664121.603 -239788.995 249
        CK12E020 S2012 03 13.34602 00 08 23.83 -04 14 28.0 6.40V 249
        CK12E020 s2012 03 13.34602 1 +1213189.08 -663663.103 -239530.630 249
        CK12E020 S2012 03 13.35433 00 08 17.22 -04 13 57.2 249
        CK12E020 s2012 03 13.35433 1 +1213279.85 -663627.325 -239507.266 249
        CK12E020 S2012 03 13.47937 00 06 58.95 -04 05 46.3 249
        CK12E020 s2012 03 13.47937 1 +1214642.30 -659656.248 -237245.809 249
        CK12E020 S2012 03 13.52100 00 06 32.50 -04 03 15.2 249
        CK12E020 s2012 03 13.52100 1 +1215094.52 -658400.064 -236531.167 249
        CK12E020 S2012 03 13.60435 00 05 36.85 -03 57 04.0 249
        CK12E020 s2012 03 13.60435 1 +1215997.71 -655879.994 -235098.587 249
        CK12E020 S2012 03 13.64601 00 05 07.31 -03 53 59.3 249
        CK12E020 s2012 03 13.64601 1 +1216448.16 -654617.504 -234381.390 249
        CK12E020 S2012 03 13.77101 00 03 37.83 -03 44 53.2 249
        CK12E020 s2012 03 13.77101 1 +1217795.11 -650819.494 -232226.026 249
        CK12E020 S2012 03 13.78927 00 03 26.59 -03 43 20.4 249
        CK12E020 s2012 03 13.78927 1 +1217990.99 -650264.293 -231911.218 249
        CK12E020 S2012 03 13.81269 00 03 05.94 -03 42 04.1 249
        CK12E020 s2012 03 13.81269 1 +1218242.73 -649549.625 -231506.088 249
        CK12E020 S2012 03 13.85435 00 02 37.92 -03 39 29.7 249
        CK12E020 s2012 03 13.85435 1 +1218689.24 -648278.703 -230785.911 249
        CK12E020 S2012 03 14.01682 06 46 27.69 +19 45 10.4 5.20R C49
        CK12E020 s2012 03 14.01682 2 +1.212484726-0.954931359-0.411866173 C49
        CK12E020 S2012 03 14.03765 06 46 38.40 +19 47 44.2 5.00R C49
        CK12E020 s2012 03 14.03765 2 +1.212887139-0.954523599-0.411689088 C49
        CK12E020 S2012 03 14.05848 06 46 49.09 +19 50 21.2 4.90R C49
        CK12E020 s2012 03 14.05848 2 +1.213289551-0.954115840-0.411511890 C49
        CK12E020 S2012 03 14.07932 06 46 60.00 +19 52 55.1 4.50R C49
        CK12E020 s2012 03 14.07932 2 +1.213691294-0.953708080-0.411334681 C49
        CK12E020 S2012 03 14.10015 06 47 10.94 +19 55 34.1 4.20R C49
        CK12E020 s2012 03 14.10015 2 +1.214093038-0.953299651-0.411157406 C49
        CK12E020 S2012 03 14.10433 23 59 20.93 -03 20 48.7 249
        CK12E020 s2012 03 14.10433 1 +1221353.40 -640619.438 -226453.251 249
        CK12E020 S2012 03 14.14601 23 58 47.61 -03 18 01.8 249
        CK12E020 s2012 03 14.14601 1 +1221794.62 -639330.494 -225725.390 249
        CK12E020 S2012 03 14.18767 23 58 11.34 -03 14 16.2 249
        CK12E020 s2012 03 14.18767 1 +1222235.01 -638047.634 -224999.914 249
        CK12E020 S2012 03 14.26682 06 48 44.06 +20 17 46.8 3.40R C49
        CK12E020 s2012 03 14.26682 2 +1.217302308-0.950029551-0.409737075 C49
        CK12E020 S2012 03 14.28765 06 48 56.10 +20 20 40.4 3.50R C49
        CK12E020 s2012 03 14.28765 2 +1.217702715-0.949619786-0.409559209 C49
        CK12E020 S2012 03 14.30848 06 49 08.56 +20 23 36.2 3.40R C49
        CK12E020 s2012 03 14.30848 2 +1.218103122-0.949210021-0.409381332 C49
        CK12E020 S2012 03 14.39605 23 55 01.03 -02 57 57.9 249
        CK12E020 s2012 03 14.39605 1 +1224425.06 -631590.098 -221362.033 249
        CK12E020 S2012 03 14.43756 23 54 21.97 -02 55 50.9 x 249
        CK12E020 s2012 03 14.43756 1 +1224859.78 -630295.962 -220633.781 249
        CK12E020 S2012 03 14.79602 23 47 09.33 -02 22 11.5 249
        CK12E020 s2012 03 14.79602 1 +1228566.83 -619078.198 -214336.277 249
        CK12E020 S2012 03 14.81269 23 46 42.31 -02 19 32.7 249
        CK12E020 s2012 03 14.81269 1 +1228737.61 -618553.277 -214042.252 249

        Station data:
        (249) SOHO.
        (C49) STEREO-A.
        (C50) STEREO-B.
        (E27) Thornlands (S27.5663 E153.2667).

        Orbital elements:
        C/2012 E2
        Perihelion 2012 Mar 15.005778 TT; Constraint: e=1
        Epoch 2012 Mar 14.0 TT = JDT 2456000.5 Earth MOID: 0.5611
        q779119.16km (2000.0) P Q
        M(N) 14.4 K 10.0 Peri. 85.7173 0.1726449 -0.9824523
        Node 6.9738 -0.9612224 -0.1836905
        e 1.0 Incl. 144.4595 0.2150470 -0.0323280
        From 33 observations 2012 Mar. 10-14; RMS error 24.552 arcseconds

        Residuals in arcseconds:
        120310 E27 11.7- 23.9+ 120313 249 22.2+ 19.0- 120314 C49 2.4- .15+
        120310 E27 9.2+ 18.5+ 120313 249 35.2+ 37.2- 120314 249 26.9- 10.4+
        120310 E27 15.1+ 14.1+ 120313 249 36.8+ 8.0- 120314 249 6.4- 12.8-
        120311 C50 26.0- 30.6- 120313 249 20.1+ 4.1+ 120314 249 19.3- 20.9+
        120311 C50 .33- 23.7- 120313 249 6.4- 25.6+ 120314 C49 3.2- .00
        120311 C50 12.1- 13.2- 120313 249 22.1+ 40.8+ 120314 C49 7.5- 1.6-
        120311 C50 9.5- 5.1- 120313 249 32.9- 17.3+ 120314 C49 8.5- 3.1-
        120311 C50 12.1+ 20.5- 120313 249 5.4+ 7.0- 120314 249 19.5- 4.0+
        120313 249 4.9- 7.2- 120314 C49 .19+ 2.7+ 120314 249(10.7+ 75.5-)
        120313 249(38.9+ 37.7+) 120314 C49 .50+ 2.2+ 120314 249 10.6- 22.8-
        120313 249 15.8+ 4.8- 120314 C49 1.1- 3.5+ 120314 249 31.7- 32.4+
        120313 249 5.3- 7.3- 120314 C49 1.1- .01+

        Regards,
        Michal

        Dnia 17 marca 2012 11:25 "terryjlovejoy" <terryjlovejoy@...> napisał(a):




        >
        > >
        >
        >  
        >
        >
        >
        > After the the release of the new orbit for C/2012 E2 (SWAN) in MPEC 2012-F02 I went back and reprocessed my images from March 10 and to my suprise found a very slightly extended starlike object in correct position and correct brightness. Here is a final stacked image consisting of 72 x 3.2 second frames with the suspect circled (The circle is 15' diameter for scale):
        >
        > http://tinyurl.com/7ryxbme
        >
        > This was a crop rescaled 2x from the original image made with a 350D + 135mm f3.5 lens mounted on a tripod. Keep in mind the comet suspect was just 4 degrees from the horizon at nautical twilight (sun at -12 degrees alititude) and was at just 17 degrees elongation. It required very agressive gradient correction and is without doubt one the hardest observations I've had to make.
        >
        > I also created 3 subframes of 24 frames each and the object is visible consistently in each and measurements in astrometrica are as follows:
        >
        > CK12E020 C2012 03 10.37527 00 30 43 -07 12 13 9.2 N E27
        > CK12E020 C2012 03 10.37632 00 30 44 -07 12 15 9.2 N E27
        > CK12E020 C2012 03 10.37736 00 30 44 -07 12 16 9.2 N E27
        >
        > The measurement error is problably no better than +/- 15 arcsecs especially given the low altitude.
        >
        > Terry
        >
        >
        >
        >
        >
        >
        >
        >
      • Pepe Chambó
        Congrats Terry! But the image link not work...? Regards.
        Message 3 of 4 , Mar 18 4:16 AM
          Congrats Terry!

          But the image link not work...?

          Regards.


          --- In comets-ml@yahoogroups.com, "terryjlovejoy" <terryjlovejoy@...> wrote:
          >
          > After the the release of the new orbit for C/2012 E2 (SWAN) in MPEC 2012-F02 I went back and reprocessed my images from March 10 and to my suprise found a very slightly extended starlike object in correct position and correct brightness. Here is a final stacked image consisting of 72 x 3.2 second frames with the suspect circled (The circle is 15' diameter for scale):
          >
          > http://tinyurl.com/7ryxbme
          >
          > This was a crop rescaled 2x from the original image made with a 350D + 135mm f3.5 lens mounted on a tripod. Keep in mind the comet suspect was just 4 degrees from the horizon at nautical twilight (sun at -12 degrees alititude) and was at just 17 degrees elongation. It required very agressive gradient correction and is without doubt one the hardest observations I've had to make.
          >
          > I also created 3 subframes of 24 frames each and the object is visible consistently in each and measurements in astrometrica are as follows:
          >
          > CK12E020 C2012 03 10.37527 00 30 43 -07 12 13 9.2 N E27
          > CK12E020 C2012 03 10.37632 00 30 44 -07 12 15 9.2 N E27
          > CK12E020 C2012 03 10.37736 00 30 44 -07 12 16 9.2 N E27
          >
          > The measurement error is problably no better than +/- 15 arcsecs especially given the low altitude.
          >
          > Terry
          >
        • terryjlovejoy
          Try this link http://tech.groups.yahoo.com/group/comets-ml/files/C2012E2_March12.jpg
          Message 4 of 4 , Mar 18 4:47 AM
            Try this link

            http://tech.groups.yahoo.com/group/comets-ml/files/C2012E2_March12.jpg


            --- In comets-ml@yahoogroups.com, Pepe Chambó <jjchambo@...> wrote:
            >
            > Congrats Terry!
            >
            > But the image link not work...?
            >
            > Regards.
            >
            >
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