Comet P/2007 V2 = 2015 P1 (Hill)

Krisztian Sarneczkyは、8月8-9日UT、Adam SodorがKonkoly天文台Piszkesteto Stationの0.60-m 
Schmidt望遠鏡によって得たフィルターなしのCCD画像からP/2007 V2 (IAUC 8894を参照)を検出した。
この彗星は、150秒10枚のスタックで6"のコマとp.a. 250°に25"の尾が見えた。

検出位置は次のとおり、

     2015 UT             R.A. (2000) Decl.       Mag.   Observer
     Aug.  8.01672    1 15 54.12   + 4 41 33.3   19.6   Sodor
           8.02657    1 15 54.38   + 4 41 34.3   19.4     "
           8.03642    1 15 54.58   + 4 41 34.3   20.1     "
           9.01785    1 16 17.51   + 4 42 44.8            "
           9.02769    1 16 17.76   + 4 42 45.4   20.0     "
           9.03753    1 16 17.98   + 4 42 46.0   20.1     "

MPC 79351のG. V. Williamsの予報に対し、Delta(T)は、-0.20 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/2007 V2 (Hill)
Epoch 2007 Aug. 8.0 TT = JDT 2454320.5
T 2007 July 30.97752 TT                                 MPCW
q   2.7750963            (2000.0)            P               Q
n   0.12016479     Peri.  278.54943     +0.94790951     -0.31569507
a   4.0670972      Node    99.86157     +0.30658374     +0.86799335
e   0.3176715      Incl.    2.47095     +0.08645216     +0.38330688
P   8.20
From 66 observations 2007 Oct. 14-2015 Aug. 9, mean residual 0".5.

    P/2007 V2 (Hill)
Epoch 2015 Oct. 25.0 TT = JDT 2457320.5
T 2015 Oct. 22.87890 TT                                 MPCW
q   2.7798334            (2000.0)            P               Q
n   0.11996323     Peri.  278.88272     +0.94632501     -0.32041375
a   4.0716517      Node    99.81379     +0.31090031     +0.86644129
e   0.3172713      Incl.    2.47046     +0.08837409     +0.38290275
P   8.22
From 66 observations 2007 Oct. 14-2015 Aug. 9, mean residual 0".5.

    P/2007 V2 (Hill)
Epoch 2024 Jan. 11.0 TT = JDT 2460320.5
T 2023 Dec. 30.48483 TT                                 MPCW
q   2.7698540            (2000.0)            P               Q
n   0.12012459     Peri.  278.65935     +0.94765559     -0.31645523
a   4.0680045      Node    99.79767     +0.30727927     +0.86772789
e   0.3191124      Incl.    2.47101     +0.08676600     +0.38328110
P   8.20
From 66 observations 2007 Oct. 14-2015 Aug. 9, mean residual 0".5.

    P/2007 V2 (Hill)
Epoch 2015 June 27.0 TT = JDT 2457200.5
T 2015 Oct. 22.89059 TT                                 MPCW
q   2.7798171            (2000.0)            P               Q
n   0.11994464     Peri.  278.88462     +0.94630700     -0.32046693
a   4.0720723      Node    99.81510     +0.31094907     +0.86642421
e   0.3173458      Incl.    2.47047     +0.08839534     +0.38289690
P   8.22
From 66 observations 2007 Oct. 14-2015 Aug. 9, mean residual 0".5.

Ephemeris:
    P/2007 V2 (Hill)
Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase   m1
2015 07 11    00 57 54.9 +03 21 55   2.5936  2.8439    93.6    20.9  20.1
...
2015 07 26    01 09 08.4 +04 15 19   2.3895  2.8270   104.9    20.3  19.9
...
2015 08 03    01 13 39.5 +04 33 49   2.2856  2.8190   111.4    19.6  19.8
...
2015 08 09    01 16 17.0 +04 42 46   2.2110  2.8135   116.5    18.8  19.7
2015 08 10    01 16 39.2 +04 43 50   2.1989  2.8126   117.3    18.7  19.7
2015 08 11    01 17 00.1 +04 44 47   2.1869  2.8117   118.2    18.5  19.7
...
2015 08 17    01 18 40.0 +04 47 48   2.1172  2.8067   123.6    17.5  19.6
...
2015 08 25    01 19 41.8 +04 44 48   2.0315  2.8007   131.0    15.8  19.5
...
2015 09 09    01 17 54.3 +04 18 26   1.8987  2.7915   146.0    11.6  19.4

(CBET 4134、MPEC 2015-P21)