Comet P/2006 K2 = 2013 B1 (McNaught)

J. V. Scotti (月惑星研究所:LPL, Arizona大学)の通報によると1月19.53日UTと20.51日、
Kitt PeakにあるSpacewatch1.8-m f/2.7望遠鏡で得た画像から21.8等と19.7等のP/2006 
K2を検出した。この天体は、二夜とも少し拡散状に見えた。

検出位置は次のとおり、

     2013 UT             R.A. (2000) Decl.       Mag.   Observer
     Jan. 19.53190   13 54 18.15   -10 39 53.1   21.8   Scotti
          19.53935   13 54 18.62   -10 39 56.0   22.0     "
          19.54616   13 54 19.08   -10 39 59.5   21.9     "
          20.50575   13 55 23.23   -10 47 31.2   19.7     "
          20.51318   13 55 23.66   -10 47 34.2   21.0     "
          20.52061   13 55 24.18   -10 47 38.0   21.9     "

MPC 69911のB. G. Marsdenの予報に対し、Delta(T)は、-0.17 dayであった。

連結軌道要素、位置推算表は次のとおり、

Orbital elements:
    P/2006 K2 = 2013 B1 (McNaught)
Epoch 2006 July 4.0 TT = JDT 2453920.5
T 2006 June 27.22775 TT                                 MPC
q   2.0866788            (2000.0)            P               Q
n   0.13891802     Peri.  238.05493     -0.28425146     +0.95824283
a   3.6923001      Node    15.52332     -0.83563285     -0.23167849
e   0.4348567      Incl.    6.68897     -0.47002005     -0.16761788
P   7.09
From 98 observations 2006 May 22-2013 Jan. 20, mean residual 0".5.

    P/2006 K2 = 2013 B1 (McNaught)
Epoch 2013 Aug. 16.0 TT = JDT 2456520.5
T 2013 Aug. 2.49291 TT                                  MPC
q   2.0977230            (2000.0)            P               Q
n   0.13840192     Peri.  237.99202     -0.28565710     +0.95782721
a   3.7014734      Node    15.50186     -0.83533357     -0.23295859
e   0.4332735      Incl.    6.68168     -0.46969975     -0.16821813
P   7.12
From 98 observations 2006 May 22-2013 Jan. 20, mean residual 0".5.

    P/2006 K2 = 2013 B1 (McNaught)
Epoch 2020 Sept. 28.0 TT = JDT 2459120.5
T 2020 Sept. 12.06325 TT                                MPC
q   2.0869752            (2000.0)            P               Q
n   0.13883607     Peri.  238.08999     -0.28492647     +0.95804777
a   3.6937528      Node    15.44742     -0.83545892     -0.23235045
e   0.4349987      Incl.    6.68490     -0.46992052     -0.16780266
P   7.10
From 98 observations 2006 May 22-2013 Jan. 20, mean residual 0".5.

    P/2006 K2 = 2013 B1 (McNaught)
Epoch 2012 Sept. 30.0 TT = JDT 2456200.5
T 2013 Aug. 2.58950 TT                                  MPC
q   2.0974631            (2000.0)            P               Q
n   0.13850550     Peri.  238.02591     -0.28507293     +0.95800101
a   3.6996279      Node    15.50294     -0.83546871     -0.23244317
e   0.4330611      Incl.    6.68269     -0.46981428     -0.16794116
P   7.12
From 98 observations 2006 May 22-2013 Jan. 20, mean residual 0".5.

Ephemeris:
    P/2006 K2 (McNaught)
Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase   m1
2012 12 21    13 17 54.3 -06 27 19   2.8642  2.6732    68.9    20.1  20.6
...
2013 01 05    13 37 07.4 -08 40 12   2.6155  2.6121    79.0    21.7  20.3
...
2013 01 13    13 46 47.9 -09 47 17   2.4816  2.5801    84.5    22.3  20.1
...
2013 01 19    13 53 42.3 -10 35 37   2.3815  2.5564    88.7    22.6  20.0
2013 01 20    13 54 49.4 -10 43 30   2.3648  2.5525    89.4    22.7  19.9
2013 01 21    13 55 55.9 -10 51 20   2.3482  2.5486    90.2    22.7  19.9
...
2013 01 27    14 02 21.4 -11 37 15   2.2492  2.5253    94.5    22.9  19.8
...
2013 02 04    14 10 15.1 -12 35 29   2.1192  2.4947   100.5    22.9  19.6
...
2013 02 19    14 22 25.7 -14 14 32   1.8856  2.4390   112.3    22.0  19.2

Computer: Williams

(CBET 3387、MPEC 2013-B58)