W. Romanishin (Oklahoma大学)とS. C. Tegler (Northern Arizona大学)は、CINEOS 
(Campo Imperatore Near Earth Objects Survey)の掃天コースに発見されたCentaur型
の小惑星状天体　2004 PY42 (MPEC 2004-P48, 2004-Q30; MPS 111230参照)が、6月7.4日
と8.4日UTにMt. Grahamの1.8-m VATT (Vatican Advanced Technology Telescope)+CCD
で得たRバンドの重ねた画像から北西に4″の不対称のコマが見えたと報告した。

発見位置は次のとおり、

     2004 UT             R.A. (2000) Decl.       Mag.
     Aug. 10.87443   20 46 08.00   -12 00 02.7   19.8

軌道要素と位置推算表は次のとおり、

Orbital elements:
    C/2004 PY42 (CINEOS)
Epoch 2001 May 11.0 TT = JDT 2452040.5
T 2001 Apr. 24.21652 TT                                 MPC
q  11.7882878            (2000.0)            P               Q
n   0.01521384     Peri.  344.04821     +0.18544557     +0.93735035
a  16.1303376      Node   295.84355     -0.86194832     +0.01104295
e   0.2691853      Incl.   19.12957     -0.47186336     +0.34821313
P  64.78
From 51 observations 2002 June 12-2005 June 17, mean residual 0".32.

Ephemeris:
    C/2004 PY42 (CINEOS)
Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase   m1    m2
2005 06 09    21 30.56   -06 21.6   11.947   12.411   115.0     4.3        20.7
2005 06 19    21 29.72   -06 14.8   11.813   12.419   124.6     3.9        20.7
2005 06 29    21 28.44   -06 10.6   11.696   12.427   134.2     3.4        20.6
2005 07 09    21 26.78   -06 09.1   11.599   12.435   143.9     2.8        20.6
2005 07 19    21 24.79   -06 10.1   11.525   12.442   153.4     2.1        20.5
2005 07 29    21 22.58   -06 13.3   11.478   12.450   162.6     1.4        20.5
2005 08 08    21 20.24   -06 18.3   11.459   12.458   169.9     0.8        20.4
2005 08 18    21 17.87   -06 24.8   11.469   12.467   169.7     0.8        20.4
2005 08 28    21 15.60   -06 32.3   11.509   12.475   162.2     1.4        20.5
2005 09 07    21 13.51   -06 40.1   11.577   12.483   152.9     2.1        20.5
2005 09 17    21 11.71   -06 47.9   11.672   12.491   143.2     2.8        20.6
2005 09 27    21 10.29   -06 55.1   11.790   12.499   133.3     3.3        20.7
2005 10 07    21 09.30   -07 01.1   11.929   12.507   123.4     3.8        20.7
2005 10 17    21 08.81   -07 05.6   12.084   12.516   113.5     4.2        20.8
2005 10 27    21 08.82   -07 08.3   12.251   12.524   103.7     4.4        20.8
2005 11 06    21 09.35   -07 08.8   12.425   12.532    93.9     4.5        20.9
2005 11 16    21 10.40   -07 06.9   12.601   12.541    84.3     4.5        20.9
2005 11 26    21 11.93   -07 02.5   12.774   12.549    74.7     4.4        20.9
2005 12 06    21 13.92   -06 55.7   12.939   12.558    65.2     4.1        20.9
2005 12 16    21 16.30   -06 46.2   13.093   12.566    55.8     3.7        20.9
2005 12 26    21 19.03   -06 34.4   13.232   12.575    46.5     3.3        20.9
2006 01 05    21 22.06   -06 20.1   13.351   12.583    37.3     2.7        20.9

(IAUC 8545、MPEC 2005-M12)