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3rd largest scattered disk object discovered

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  • Matson, Robert D.
    Hi All, MPEC 2008-D38 for 2007 UK126 seems to have generated little fanfare so far, though this object is certainly noteworthy.
    Message 1 of 5 , Feb 27, 2008
      Hi All,

      MPEC 2008-D38 for 2007 UK126 seems to have generated little fanfare
      so far, though this object is certainly noteworthy.

      http://www.cfa.harvard.edu/mpec/K08/K08D38.html

      It is among the five largest Scattered Disk Objects known, and I
      believe it may prove to be the third largest, surpassed only by
      Eris and Sedna.

      The 19 measurements for it at 675 by Schwamb, Brown & Rabinowitz
      result in an H of 4.0, which would be surpassed by (84522) 2002 TC302
      [3.9] and 2005 QU182 [3.7]. However, last night I submitted an
      additional 17 precovery positions for 2007 UK126 from 2001-2002
      that suggest the absolute magnitude is at least as bright as 3.6.
      Updated solution using Find_Orb:

      Orbital elements:
      2007 UK126
      Perihelion 2046 Jun 23.357144 TT = 8:34:17 (JD 2468519.857144)
      Epoch 2008 Jan 15.0 TT = JDT 2454480.5 Find_Orb
      M 337.78432 (2000.0) P Q
      n 0.00158238 Peri. 346.74770 -0.48122336 -0.82406797
      a 72.9336418 Node 131.09559 0.83609079 -0.53393292
      e 0.4855111 Incl. 23.36646 0.26339372 0.18928181
      P 622.86 H 3.4 G 0.15 q 37.5235421 Q 108.343741
      From 36 observations 2001 Dec. 14-2008 Jan. 15; RMS error 0.371
      arcseconds

      011214 644 .07+ .10- 021028 644 .22- .50- 071020 675 .17+
      .38+
      011214 644 .24+ .09- 021028 644 .05- .16- 071020 675 .21-
      .38+
      021005 644 .17+ .12- 021106 644 .12+ .27+ 071113 675 .41+
      .01-
      021005 644 .12- .21- 021106 644 .10+ .16+ 071113 675 .22-
      .17+
      021005 644 .55- .10+ 021106 644 .38- .06- 071113 675 .09+
      .04-
      021006 644 .56+ .36+ 061205 675 .01- .22+ 071114 675 .13+
      .05-
      021006 644 .13+ .16+ 061205 675 .16- .89+ 071203 675 .04+
      .49-
      021006 644 .30- .13- 061212 675 .03+ .22+ 071203 675 .18-
      .22-
      021010 644 .08+ .16+ 061212 675 .01+ .10+ 071203 675 .07+
      .35-
      021010 644 .01- .04- 061212 675 .09+ .27+ 071203 675 .01-
      .48-
      021010 644 .05+ .24- 071019 675 .10- .19+ 080114 675 .12-
      .80-
      021028 644 .07+ .07+ 071019 675 .02- .25+ 080115 675 .01+
      .28-

      Station data:
      (644) Palomar Mountain/NEAT (N33.3574 W116.8589). Observers E. F. Helin,
      S.
      Pravdo, K. Lawrence, K. Kuluhiwa, M. Hicks, R. Thicksten. Measurer
      R.
      Matson. 1.2-m Schmidt + CCD.
      (675) Palomar Mountain (N33.3561 W116.8640). Palomar Mountain.
      Observers
      M. E. Schwamb, M. E. Brown, D. Rabinowitz. 1.2-m Oschin Schmidt +
      CCD.

      --Rob
    • andrew_j_walker
      Nice work with this one! Has anyone checked earlier plates yet? Andrew
      Message 2 of 5 , Feb 28, 2008
        Nice work with this one! Has anyone checked earlier plates yet?

        Andrew

        --- In mpml@yahoogroups.com, "Matson, Robert D." <matsonr@...> wrote:
        >
        > Hi All,
        >
        > MPEC 2008-D38 for 2007 UK126 seems to have generated little fanfare
        > so far, though this object is certainly noteworthy.
        >
        > http://www.cfa.harvard.edu/mpec/K08/K08D38.html
        >
        > It is among the five largest Scattered Disk Objects known, and I
        > believe it may prove to be the third largest, surpassed only by
        > Eris and Sedna.
        >
        > The 19 measurements for it at 675 by Schwamb, Brown & Rabinowitz
        > result in an H of 4.0, which would be surpassed by (84522) 2002 TC302
        > [3.9] and 2005 QU182 [3.7]. However, last night I submitted an
        > additional 17 precovery positions for 2007 UK126 from 2001-2002
        > that suggest the absolute magnitude is at least as bright as 3.6.
        > Updated solution using Find_Orb:
        >
        > Orbital elements:
        > 2007 UK126
        > Perihelion 2046 Jun 23.357144 TT = 8:34:17 (JD 2468519.857144)
        > Epoch 2008 Jan 15.0 TT = JDT 2454480.5 Find_Orb
        > M 337.78432 (2000.0) P Q
        > n 0.00158238 Peri. 346.74770 -0.48122336 -0.82406797
        > a 72.9336418 Node 131.09559 0.83609079 -0.53393292
        > e 0.4855111 Incl. 23.36646 0.26339372 0.18928181
        > P 622.86 H 3.4 G 0.15 q 37.5235421 Q 108.343741
        > From 36 observations 2001 Dec. 14-2008 Jan. 15; RMS error 0.371
        > arcseconds
        >
        > 011214 644 .07+ .10- 021028 644 .22- .50- 071020 675 .17+
        > .38+
        > 011214 644 .24+ .09- 021028 644 .05- .16- 071020 675 .21-
        > .38+
        > 021005 644 .17+ .12- 021106 644 .12+ .27+ 071113 675 .41+
        > .01-
        > 021005 644 .12- .21- 021106 644 .10+ .16+ 071113 675 .22-
        > .17+
        > 021005 644 .55- .10+ 021106 644 .38- .06- 071113 675 .09+
        > .04-
        > 021006 644 .56+ .36+ 061205 675 .01- .22+ 071114 675 .13+
        > .05-
        > 021006 644 .13+ .16+ 061205 675 .16- .89+ 071203 675 .04+
        > .49-
        > 021006 644 .30- .13- 061212 675 .03+ .22+ 071203 675 .18-
        > .22-
        > 021010 644 .08+ .16+ 061212 675 .01+ .10+ 071203 675 .07+
        > .35-
        > 021010 644 .01- .04- 061212 675 .09+ .27+ 071203 675 .01-
        > .48-
        > 021010 644 .05+ .24- 071019 675 .10- .19+ 080114 675 .12-
        > .80-
        > 021028 644 .07+ .07+ 071019 675 .02- .25+ 080115 675 .01+
        > .28-
        >
        > Station data:
        > (644) Palomar Mountain/NEAT (N33.3574 W116.8589). Observers E. F. Helin,
        > S.
        > Pravdo, K. Lawrence, K. Kuluhiwa, M. Hicks, R. Thicksten. Measurer
        > R.
        > Matson. 1.2-m Schmidt + CCD.
        > (675) Palomar Mountain (N33.3561 W116.8640). Palomar Mountain.
        > Observers
        > M. E. Schwamb, M. E. Brown, D. Rabinowitz. 1.2-m Oschin Schmidt +
        > CCD.
        >
        > --Rob
        >
      • Andrew Lowe
        I added five measures using the DSS archive, from 1982-1997. You can check the resultant orbit and residuals with the MPC s Minor Planet Ephemeris Service.
        Message 3 of 5 , Feb 28, 2008
          I added five measures using the DSS archive, from 1982-1997. You can
          check the resultant orbit and residuals with the MPC's Minor Planet
          Ephemeris Service.

          Andrew Lowe
          http://members.shaw.ca/andrewlowe/home.htm


          --- In mpml@yahoogroups.com, "andrew_j_walker" <Andrew.Walker@...>
          wrote:
          >
          >
          > Nice work with this one! Has anyone checked earlier plates yet?
          >
          > Andrew
        • Andrew Lowe
          I ve had a few inquiries into my precovery work for 2007 UK126, so I ve added the following to my website: http://members.shaw.ca/andrewlowe/2007uk126.htm
          Message 4 of 5 , Feb 29, 2008
            I've had a few inquiries into my precovery work for 2007 UK126, so I've
            added the following to my website:

            http://members.shaw.ca/andrewlowe/2007uk126.htm

            which includes the five images from DSS.

            Andrew
            http://members.shaw.ca/andrewlowe/home.htm
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