Comet P/2006 R2 = 2013 L1 (Christensen) J. V. Scotti (月惑星研究所:LPL, Arizona大学)の通報によると6月1日UTと4日UT、Kitt Peak にあるSpacewatch1.8-m反射望遠鏡で得た画像から21.5等から22.3等のP/2006 R2を検出した。 120秒9枚のスタック画像では限界に近くまだこの天体は微かな恒星状に見えていた。 検出位置は次のとおり、 2013 UT R.A. (2000) Decl. Mag. Observer June 1.29149 15 11 01.89 + 4 07 37.6 22.1 Scotti 1.30452 15 11 01.43 + 4 07 36.8 22.3 " 1.31759 15 11 00.96 + 4 07 36.8 22.0 " 4.28331 15 09 26.07 + 4 06 42.8 21.7 " 4.29634 15 09 25.66 + 4 06 42.4 22.2 " 4.30939 15 09 25.26 + 4 06 42.3 21.5 " MPC 75735のB. G. Marsdenの予報に対し、Delta(T)は、-0.78 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 R2 = 2013 L1 (Christensen) Epoch 2006 July 4.0 TT = JDT 2453920.5 T 2006 June 15.09745 TT MPC q 3.0390017 (2000.0) P Q n 0.11587564 Peri. 188.84582 +0.84401207 +0.50386725 a 4.1668509 Node 139.15577 -0.47328336 +0.86088589 e 0.2706718 Incl. 16.31693 -0.25228256 +0.07066313 P 8.51 From 124 observations 2006 Aug. 30-2013 June 4, mean residual 0".6. P/2006 R2 = 2013 L1 (Christensen) Epoch 2014 Dec. 9.0 TT = JDT 2457000.5 T 2014 Dec. 28.44531 TT MPC q 3.0540581 (2000.0) P Q n 0.11536355 Peri. 189.08497 +0.84520986 +0.50178877 a 4.1791727 Node 139.05815 -0.47101642 +0.86201770 e 0.2692195 Incl. 16.30054 -0.25251499 +0.07164853 P 8.54 From 124 observations 2006 Aug. 30-2013 June 4, mean residual 0".6. P/2006 R2 = 2013 L1 (Christensen) Epoch 2023 June 25.0 TT = JDT 2460120.5 T 2023 July 5.92280 TT MPC q 3.0341595 (2000.0) P Q n 0.11603064 Peri. 189.14454 +0.84555896 +0.50109790 a 4.1631391 Node 139.04067 -0.47034640 +0.86242966 e 0.2711847 Incl. 16.32004 -0.25259516 +0.07152603 P 8.49 From 124 observations 2006 Aug. 30-2013 June 4, mean residual 0".6. P/2006 R2 = 2013 L1 (Christensen) Epoch 2013 Apr. 18.0 TT = JDT 2456400.5 T 2014 Dec. 28.79493 TT MPC q 3.0526654 (2000.0) P Q n 0.11539331 Peri. 189.16711 +0.84607704 +0.50035491 a 4.1784540 Node 139.07407 -0.46956545 +0.86281326 e 0.2694271 Incl. 16.29855 -0.25231316 +0.07209890 P 8.54 From 124 observations 2006 Aug. 30-2013 June 4, mean residual 0".6. Ephemeris: P/2006 R2 (Christensen) Date TT R. A. (2000) Decl. Delta r Elong. Phase m1 2013 05 05 15 27 29.4 +03 21 30 3.1256 4.0791 158.2 5.3 22.1 ... 2013 05 20 15 18 14.4 +03 58 33 3.1041 4.0443 155.1 6.1 22.0 ... 2013 05 28 15 13 26.9 +04 06 47 3.1174 4.0257 149.8 7.3 22.0 ... 2013 06 03 15 10 06.6 +04 07 17 3.1379 4.0117 145.1 8.3 22.0 2013 06 04 15 09 35.0 +04 06 53 3.1422 4.0094 144.2 8.5 22.0 2013 06 05 15 09 03.9 +04 06 21 3.1467 4.0070 143.4 8.7 22.0 ... 2013 06 11 15 06 10.5 +04 00 18 3.1783 3.9930 138.2 9.8 22.0 ... 2013 06 19 15 02 59.7 +03 44 55 3.2320 3.9743 131.1 11.1 22.0 ... 2013 07 04 14 59 28.8 +02 55 50 3.3619 3.9391 117.7 13.2 22.1 Computer: Williams (CBET 3541、MPEC 2013-L19)