Comet P/2005 YQ127 = 2013 A3 (LINEAR)

J. V. Scotti (月惑星研究所:LPL, Arizona大学)の通報によると1月7.10日UTと18.09日、
Spacewatch1.8-m f/2.7望遠鏡で得た画像から21.4等と20.4等のP/2005 YQ127を検出した。
この天体は、微かで二夜とも恒星状に見えた。

検出位置は次のとおり、

     2013 UT             R.A. (2000) Decl.       Mag.   Observer
     Jan.  7.10373   22 45 54.50   + 7 59 21.3   21.4   Scotti
           7.11476   22 45 55.54   + 7 59 25.4   21.5     "
           7.12542   22 45 56.59   + 7 59 28.9   21.0     "
          18.09484   23 04 43.57   + 9 13 40.9   20.4     "
          18.09886   23 04 43.96   + 9 13 42.6   20.2     "
          18.10335   23 04 44.47   + 9 13 46.1   20.2     "

MPC 69910のB. G. Marsdenの予報に対し、Delta(T)は、+0.13 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/2005 YQ127 = 2013 A3 (LINEAR)
Epoch 2005 Nov. 6.0 TT = JDT 2453680.5
T 2005 Nov. 3.96383 TT                                  MPC
q   1.9190782            (2000.0)            P               Q
n   0.12961704     Peri.  152.30625     +0.34397097     -0.89436629
a   3.8668854      Node   276.37790     +0.79951434     +0.43868785
e   0.5037147      Incl.   16.72484     +0.49240307     -0.08753231
P   7.60
From 160 observations 2005 Sept. 15-2013 Jan. 18, mean residual 0".6.

    P/2005 YQ127 = 2013 A3 (LINEAR)
Epoch 2013 May 28.0 TT = JDT 2456440.5
T 2013 June 5.91636 TT                                  MPC
q   1.9131998            (2000.0)            P               Q
n   0.12987764     Peri.  152.29349     +0.34438007     -0.89408450
a   3.8617113      Node   276.36168     +0.79925119     +0.43924287
e   0.5045720      Incl.   16.74768     +0.49254431     -0.08762764
P   7.59
From 160 observations 2005 Sept. 15-2013 Jan. 18, mean residual 0".6.

    P/2005 YQ127 = 2013 A3 (LINEAR)
Epoch 2020 Dec. 17.0 TT = JDT 2459200.5
T 2020 Dec. 30.21376 TT                                 MPC
q   1.9044914            (2000.0)            P               Q
n   0.13036074     Peri.  152.32404     +0.34410272     -0.89402177
a   3.8521645      Node   276.34491     +0.79928891     +0.43925507
e   0.5056049      Incl.   16.77895     +0.49267694     -0.08820462
P   7.56
From 160 observations 2005 Sept. 15-2013 Jan. 18, mean residual 0".6.

    P/2005 YQ127 = 2013 A3 (LINEAR)
Epoch 2012 Sept. 30.0 TT = JDT 2456200.5
T 2013 June 5.94479 TT                                  MPC
q   1.9132561            (2000.0)            P               Q
n   0.12996982     Peri.  152.29878     +0.34426444     -0.89413110
a   3.8598850      Node   276.36377     +0.79930429     +0.43913720
e   0.5043230      Incl.   16.74736     +0.49253897     -0.08768180
P   7.58
From 160 observations 2005 Sept. 15-2013 Jan. 18, mean residual 0".6.

Ephemeris:
    P/2005 YQ127 (LINEAR)
Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase   m1
2012 12 19    22 16 47.8 +06 24 29   2.5019  2.3877    71.9    23.1  19.8
...
2013 01 03    22 39 15.2 +07 35 09   2.5980  2.3190    62.8    22.1  19.7
...
2013 01 11    22 52 25.2 +08 24 11   2.6440  2.2835    58.2    21.5  19.7
...
2013 01 17    23 02 47.5 +09 05 43   2.6758  2.2575    54.8    20.9  19.7
2013 01 18    23 04 33.5 +09 13 00   2.6809  2.2532    54.3    20.8  19.7
2013 01 19    23 06 20.3 +09 20 24   2.6859  2.2489    53.8    20.7  19.7
...
2013 01 25    23 17 14.0 +10 06 49   2.7145  2.2237    50.6    20.0  19.6
...
2013 02 02    23 32 20.3 +11 13 43   2.7492  2.1911    46.5    19.0  19.6
...
2013 02 17    00 02 21.8 +13 31 46   2.8035  2.1333    39.3    17.1  19.5

Computer: Williams

(CBET 3384、MPEC 2013-B18)