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New HST image of comet P/2010 A2 (LINEAR) on Jan 29, 2010 shows X-pattern at coma head location

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  • Charles Bell
    New HST image of comet P/2010 A2 (LINEAR) on Jan 29, 2010 shows X-pattern at coma head location
    Message 1 of 2 , Feb 2, 2010
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      New HST image of comet P/2010 A2 (LINEAR) on Jan 29, 2010 shows X-pattern at coma head location

      http://hubblesite.org/newscenter/archive/releases/2010/07/image/a/


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    • RICHARD MILES
      Thanks Charles for your alert and to Ron Baalke s via the MPML group. ... So, where does asteroid 2010 AA15 fit with this hypothesis? No mention is made of
      Message 2 of 2 , Feb 2, 2010
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        Thanks Charles for your alert and to Ron Baalke's via the MPML group.

        N.B. The press release includes the text:

        > "If this interpretation is correct, two small and previously unknown
        > asteroids recently collided, creating a shower of debris that is being
        > swept back into a tail from the collision site by the pressure of
        > sunlight," says Jewitt. The main nucleus of P/2010 A2 would be the
        > surviving remnant of this so-called hypervelocity collision. <

        So, where does asteroid 2010 AA15 fit with this hypothesis? No mention is
        made of this 400-metre body, which may also have survived the postulated
        collision. Maybe the 'remnant' associated with the comet first struck 2010
        AA15 and rebounded largely intact along with its debris cloud. It seems
        that no-one has reported astrometry of 2010 AA15 since January 19. The two
        objects have very similar orbits although how similar I am not sure since
        the astrometry of the comet will have limited accuracy owing to the lack of
        a definite pseudonucleus to measure. Current orbital parameters, rounded
        off in value, are:

        2010 AA15
        a = 2.310, Node 324.23 q = 1.989
        e = 0.139, Incl. 4.66 P 3.51

        P/2010 A2 (LINEAR)
        a = 2.294, Node 320.12 q = 2.012
        e = 0.123 Incl. 5.29 P 3.48

        I have just submitted astrometry of this asteroid along with astrometry of
        the 130-meter 'remnant' thanks to images taken under very good seeing by
        André Debackère of College Le Monteil (see below).

        Richard Miles
        British Astronomical Association
        --------
        COD F65
        COM Stack of 4 images, total integration time = 320 s
        OBS A. Debackère
        MEA R. Miles
        TEL 2.0-m f/10.0 Ritchey-Chretien + CCD
        ACK MPCReport file updated 2010.02.02 16:35:04
        AC2 rmiles@baa.u-net.com
        NET USNO-B1.0
        K10A15A C2010 01 22.46034 06 52 28.77 +27 44 00.5 21.2 V
        F65
        K10A15A C2010 01 22.46234 06 52 28.64 +27 44 00.2 22.0 V
        F65
        K10A15A C2010 01 22.46438 06 52 28.52 +27 43 59.7 21.5 V
        F65
        K10A15A C2010 01 22.46649 06 52 28.41 +27 43 59.3 21.4 V
        F65
        FRAG001 C2010 01 22.46338 06 52 18.49 +27 42 55.2 23.8 V
        F65
        ----- end -----

        ----- Original Message -----
        From: "Charles Bell" <charbell@...>
        To: "Comet-Images" <Comet-Images@yahoogroups.com>; "comets-ml"
        <comets-ml@yahoogroups.com>
        Sent: Tuesday, February 02, 2010 4:04 PM
        Subject: [comets-ml] New HST image of comet P/2010 A2 (LINEAR) on Jan 29,
        2010 shows X-pattern at coma head location


        > New HST image of comet P/2010 A2 (LINEAR) on Jan 29, 2010 shows X-pattern
        > at coma head location
        >
        > http://hubblesite.org/newscenter/archive/releases/2010/07/image/a/
        >
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