Comet P/2004 T1 = 2017 M2 (LINEAR-NEAT) Erwin Schwab (Egelsbach, ドイツ)の通報によると、6月21-22日UT、P/2004 T1 (IAUC 8416参照)が、 Pablo Ruizによって、スペイン領カナリア諸島Tenerife島にあるESA(欧州宇宙機関)の光学地上局の 1.0-m f/4.4反射望遠鏡で得た画像(測定はM. Micheli, D. Koschny, A. Knoefelと M. Busch)から 検出された。 この彗星は弱くコマが見られないが、p.a. 270°に少なくとも10"伸びた広い尾がある。 MPC 89018のB. G. Marsdenの予報に対して、Delta(T)は、-0.57 dayであった。 検出位置は次のとおり、 2017 UT R.A. (2000) Decl. Mag. Observer June 21.17155 0 34 26.33 - 9 23 02.6 19.6 Ruiz 21.17759 0 34 27.04 - 9 22 59.4 19.5 " 21.18362 0 34 27.68 - 9 22 55.8 19.5 " 22.17362 0 36 19.99 - 9 13 48.1 19.1 " 22.18569 0 36 21.36 - 9 13 41.2 19.3 " 連結軌道要素と位置推算表は次のとおり、 Orbital elements: P/2004 T1 (LINEAR-NEAT) Epoch 2004 Nov. 11.0 TT = JDT 2453320.5 T 2004 Nov. 7.76696 TT MPCW q 1.7095509 (2000.0) P Q n 0.15235568 Peri. 336.52202 +0.87732764 -0.45592833 a 3.4718712 Node 51.46034 +0.46503560 +0.73067035 e 0.5075996 Incl. 11.03771 +0.11848246 +0.50818324 P 6.47 From 424 observations 2004 July 16-2017 June 22, mean residual 0".6. P/2004 T1 (LINEAR-NEAT) Epoch 2011 Apr. 29.0 TT = JDT 2455680.5 T 2011 Apr. 24.57212 TT MPCW q 1.7077337 (2000.0) P Q n 0.15235624 Peri. 336.40391 +0.87842631 -0.45379149 a 3.4718628 Node 51.43995 +0.46326573 +0.73172051 e 0.5081218 Incl. 11.04460 +0.11726926 +0.50858468 P 6.47 From 424 observations 2004 July 16-2017 June 22, mean residual 0".6. P/2004 T1 (LINEAR-NEAT) Epoch 2017 Oct. 14.0 TT = JDT 2458040.5 T 2017 Oct. 12.68623 TT MPCW q 1.7159573 (2000.0) P Q n 0.15204336 Peri. 336.34336 +0.87875814 -0.45318831 a 3.4766242 Node 51.45940 +0.46272386 +0.73216449 e 0.5064300 Incl. 11.03260 +0.11692204 +0.50848355 P 6.48 From 424 observations 2004 July 16-2017 June 22, mean residual 0".6. P/2004 T1 (LINEAR-NEAT) Epoch 2024 Mar. 31.0 TT = JDT 2460400.5 T 2024 Apr. 1.50869 TT MPCW q 1.7067834 (2000.0) P Q n 0.15249870 Peri. 336.34295 +0.87896445 -0.45274058 a 3.4697002 Node 51.43279 +0.46239617 +0.73224214 e 0.5080891 Incl. 11.04745 +0.11666737 +0.50877049 P 6.46 From 424 observations 2004 July 16-2017 June 22, mean residual 0".6. P/2004 T1 (LINEAR-NEAT) Epoch 2017 Sept. 4.0 TT = JDT 2458000.5 T 2017 Oct. 12.68751 TT MPCW q 1.7159562 (2000.0) P Q n 0.15204180 Peri. 336.34386 +0.87875256 -0.45319925 a 3.4766479 Node 51.45960 +0.46273293 +0.73215944 e 0.5064337 Incl. 11.03254 +0.11692808 +0.50848107 P 6.48 From 424 observations 2004 July 16-2017 June 22, mean residual 0".6. Ephemeris: P/2004 T1 (LINEAR-NEAT) Date TT R. A. (2000) Decl. Delta r Elong. Phase m1 m2 2017 05 23 23 38 28.4 -13 58 01 2.2100 2.1391 72.7 26.9 20.1 ... 2017 06 07 00 07 24.2 -11 35 46 1.9966 2.0667 79.4 28.9 19.8 ... 2017 06 15 00 22 42.6 -10 20 26 1.8860 2.0296 83.0 29.8 19.7 ... 2017 06 21 00 34 06.5 -09 24 35 1.8048 2.0026 85.6 30.4 19.6 2017 06 22 00 36 00.0 -09 15 21 1.7914 1.9982 86.1 30.5 19.6 2017 06 23 00 37 53.2 -09 06 08 1.7781 1.9938 86.5 30.6 19.6 ... 2017 06 29 00 49 08.8 -08 11 26 1.6991 1.9679 89.2 31.1 19.5 ... 2017 07 07 01 03 56.5 -07 00 12 1.5969 1.9346 92.8 31.7 19.3 ... 2017 07 22 01 30 44.9 -04 53 04 1.4154 1.8770 99.8 32.2 19.0 (CBET 4406、MPEC 2017-M40)