Comet P/2010 R2 = 2015 K3 (La Sagra) 3月21日、4月18日UT、S. S. SheppardがLas Campanas天文台の6.5m Magellan-Baade telescopeによって (測定はM. MicheliとH. H. Hsieh)、5月22日UT、J. V. ScottiがKitt PeakのSpacewatch 1.8-m f/2.7 反射望遠鏡によって検出された。 ICQ's 2014 Comet Handbookの中野主一氏の予報に対し、Delta(T)は、-0.03 dayであった。 検出位置は次のとおり、 2015 UT R.A. (2000) Decl. Mag. Observer Mar. 21.40571 19 21 19.01 -22 44 03.0 22.8 Sheppard 21.41005 19 21 19.35 -22 44 01.3 22.6 " Apr. 18.39658 19 50 33.27 -19 13 50.2 22.5 " 18.40222 19 50 33.54 -19 13 47.4 22.4 " 18.40784 19 50 33.82 -19 13 44.8 22.6 " May 22.42872 20 06 28.00 -14 21 58.8 21.6 Scotti 22.43625 20 06 28.00 -14 21 54.6 21.9 " 22.44381 20 06 28.05 -14 21 50.2 22.7 " 連結軌道要素、位置推算表は次のとおり、 Orbital elements: P/2010 R2 = 2015 K3 (La Sagra) Epoch 2010 June 13.0 TT = JDT 2455360.5 T 2010 June 25.78399 TT MPCW q 2.6226473 (2000.0) P Q n 0.18075516 Peri. 59.53556 +0.80916779 +0.46060640 a 3.0979584 Node 270.75827 -0.58047329 +0.72290049 e 0.1534272 Incl. 21.39810 +0.09109469 +0.51503071 P 5.45 From 405 observations 2010 Aug. 12-2015 May 22, mean residual 0".6. P/2010 R2 = 2015 K3 (La Sagra) Epoch 2015 Dec. 4.0 TT = JDT 2457360.5 T 2015 Nov. 29.90222 TT MPCW q 2.6198415 (2000.0) P Q n 0.18093348 Peri. 58.55676 +0.80011550 +0.47592273 a 3.0959226 Node 270.65011 -0.59422654 +0.71199358 e 0.1537768 Incl. 21.41643 +0.08191471 +0.51629711 P 5.45 From 405 observations 2010 Aug. 12-2015 May 22, mean residual 0".6. P/2010 R2 = 2015 K3 (La Sagra) Epoch 2021 Apr. 26.0 TT = JDT 2459330.5 T 2021 May 5.98877 TT MPCW q 2.6185937 (2000.0) P Q n 0.18079202 Peri. 57.68105 +0.79255525 +0.48854264 a 3.0975373 Node 270.62254 -0.60532728 +0.70265194 e 0.1546208 Incl. 21.40531 +0.07372289 +0.51730682 P 5.45 From 405 observations 2010 Aug. 12-2015 May 22, mean residual 0".6. P/2010 R2 = 2015 K3 (La Sagra) Epoch 2015 June 27.0 TT = JDT 2457200.5 T 2015 Nov. 29.99393 TT MPCW q 2.6198080 (2000.0) P Q n 0.18094360 Peri. 58.57702 +0.80030082 +0.47559769 a 3.0958072 Node 270.65267 -0.59394784 +0.71221955 e 0.1537561 Incl. 21.41751 +0.08212527 +0.51628495 P 5.45 From 405 observations 2010 Aug. 12-2015 May 22, mean residual 0".6. Ephemeris: P/2010 R2 (La Sagra) Date TT R. A. (2000) Decl. Delta r Elong. Phase m1 2015 04 26 19 56 14.2 -18 11 05 2.4423 2.7637 97.7 21.1 19.4 ... 2015 05 11 20 04 00.2 -16 02 27 2.2318 2.7460 110.0 20.2 19.1 ... 2015 05 19 20 06 03.8 -14 52 12 2.1264 2.7370 116.9 19.2 19.0 ... 2015 05 25 20 06 34.3 -13 59 15 2.0517 2.7303 122.3 18.3 18.9 2015 05 26 20 06 34.1 -13 50 26 2.0398 2.7292 123.2 18.1 18.9 2015 05 27 20 06 32.3 -13 41 37 2.0279 2.7282 124.1 17.9 18.9 ... 2015 06 02 20 05 49.5 -12 48 53 1.9597 2.7217 129.7 16.7 18.8 ... 2015 06 10 20 03 26.1 -11 39 37 1.8779 2.7134 137.4 14.7 18.7 ... 2015 06 25 19 54 45.6 -09 36 42 1.7585 2.6986 152.0 10.2 18.5 (CBET 4107、MPEC 2015-K101)