Nakano Note (Nakano wa Kangaeru noda) NK 2176 C/2011 L4 (PANSTARRS)

The following improved orbital elements, by S. Nakano, are from 175 observations 2011 May 21 to Oct. 16. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.39 arc second. Epoch = 2013 Mar. 9.0 TT T = 2013 Mar. 10.14918 +/- 0.02477 (m.e.) TT Peri. = 333.65362 +/- 0.00115 Node = 65.66629 +/- 0.00020 (2000.0) Inc. = 84.20104 +/- 0.00296 q = 0.3014927 +/- 0.0000084 AU e = 1.0000308 +/- 0.0000087 1/a = -0.0001022 +/- 0.0000289 1/AU origin = +0.000026 (Q= 6) future = +0.000441 The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2011/ 110618 J01 0.5+ 0.1+ 110627 215 1.1+ 0.0 110521 F51 0.1+ 0.2+ 110618 J01 0.3+ 0.1- 110628 E10 0.0 0.1- 110521 F51 0.1+ 0.2+ 110618 J01 0.3+ 0.2- 110628 E10 0.0 0.1+ 110521 F51 0.0 0.1+ 110619 E12 1.6+ 0.6- 110629 F65 0.2- 0.0 110521 F51 0.0 0.1+ 110619 E12 0.1- 0.3- 110629 F65 0.2- 0.0 110524 G96 0.2- 0.2+ 110619 E12 1.3- 0.0 110629 F65 0.3- 0.0 110524 G96 0.4- 0.0 110619 E12 0.4- 0.0 110629 F65 0.2- 0.3- 110524 G96 0.6- 0.0 110619 204 0.2- 0.5+ 110629 F65 0.2- 0.0 110524 G96 0.3- 0.1- 110619 J01 0.2- 0.4- 110701 850 0.1+ 0.3+ 110530 H06 1.7+ 0.4- 110619 204 0.8+ 1.0+ 110701 850 0.5+ 0.0 110530 H06 1.4+ 0.5+ 110619 J01 0.1- 0.3- 110701 850 0.1- 0.5- 110606 F51 0.1+ 0.0 110619 J01 0.2- 0.2- 110701 850 0.8+ 0.1- 110606 F51 0.1+ 0.1- 110621 104 (3.7+ 1.5-) 110701 850 (0.5+ 2.1-) 110606 F51 0.0 0.1- 110621 104 (2.2- 0.5-) 110705 213 0.5- 0.2- 110606 F51 0.0 0.0 110622 H06 0.7+ 0.5- 110705 213 0.3+ 0.3+ 110607 H21 0.1- 0.0 110622 H06 0.5+ 0.3- 110705 213 0.5+ 0.2- 110607 H21 0.0 0.0 110622 H06 0.5+ 0.4- 110707 E12 0.5+ 1.3+ 110607 H21 0.3+ 0.0 110622 H15 1.1+ 0.8- 110707 E12 0.7+ 0.1- 110607 G96 0.3- 0.1- 110622 H15 0.2+ 0.5- 110707 E12 0.8+ 1.1+ 110607 G96 0.4- 0.0 110622 H15 0.3+ 0.1- 110707 E12 0.9+ 1.0+ 110607 G96 0.4- 0.0 110624 G51 0.3- 0.1+ 110708 F65 0.3- 0.2- 110607 G96 0.1+ 0.2- 110624 G51 0.0 0.2- 110708 F65 0.0 0.0 110607 H10 0.1- 0.0 110624 G51 0.5- 0.2- 110708 F65 0.3- 0.1- 110607 H10 0.5- 0.0 110624 H06 0.4+ 0.7+ 110708 F65 0.0 0.0 110607 H10 0.5- 0.2+ 110624 H06 0.9+ 0.4+ 110708 F65 0.0 0.3+ 110607 H10 0.1+ 1.5- 110624 F65 0.2- 0.1- 110708 F65 0.0 0.1- 110607 H10 0.2+ 1.1- 110624 F65 0.2- 0.1- 110714 D90 0.6+ 0.5- 110607 H10 0.0 0.6- 110624 F65 0.0 0.2- 110714 D90 0.8+ 0.2- 110607 568 0.2- 0.0 110624 F65 0.2- 0.0 110714 D90 0.4+ 0.3- 110607 568 0.2- 0.0 110624 F65 0.0 0.3- 110720 F65 0.0 0.1+ 110607 568 0.2- 0.0 110624 F65 0.1- 0.2- 110720 F65 0.0 0.1+ 110607 D90 0.1- 0.0 110624 J24 0.5- 0.2+ 110720 F65 0.0 0.1+ 110607 D90 0.1- 0.2- 110624 J24 0.2+ 1.0+ 110720 F65 0.0 0.1+ 110607 D90 0.1+ 0.3+ 110625 J24 0.2+ 0.2- 110726 G68 0.3- 0.0 110607 F65 0.2- 0.1- 110625 H06 0.7+ 0.9+ 110726 G68 (0.9+ 2.3+) 110607 F65 0.3- 0.0 110625 H06 0.5+ 0.1+ 110819 568 0.1- 0.1+ 110607 F65 0.3- 0.1- 110625 H06 0.6+ 0.5+ 110819 568 0.1- 0.1+ 110608 G96 0.3+ 0.1+ 110625 H06 0.4+ 0.2+ 110819 568 0.1- 0.1+ 110608 G96 0.0 0.3+ 110625 E10 0.2- 0.0 110820 H06 0.1+ 0.0 110608 G96 0.2+ 0.1- 110625 E10 0.1- 0.1- 110820 H06 0.3+ 0.2+ 110608 G96 0.2- 0.2+ 110625 E10 0.0 0.0 110829 568 0.1+ 0.0 110608 H06 1.1+ 0.3+ 110625 E10 0.1- 0.1- 110829 568 0.0 0.0 110608 H06 0.7+ 0.2+ 110625 E10 0.2- 0.1- 110829 568 0.0 0.0 110608 H06 0.7+ 0.2+ 110625 E10 0.1- 0.1- 110829 568 0.0 0.0 110608 A77 0.9- 1.0+ 110625 157 1.1+ 0.2- 110903 568 0.0 0.0 110608 A77 0.9+ 0.1- 110625 157 1.5+ 0.5- 110903 568 0.0 0.0 110608 A77 0.1- 1.0- 110626 H10 0.6- 0.3+ 110906 D90 0.3+ 0.1- 110610 A77 0.5+ 0.2- 110626 H10 0.4- 0.5+ 110906 D90 0.2+ 0.0 110610 A77 0.3+ 0.4+ 110626 H10 0.2+ 1.2+ 110906 D90 0.1+ 0.2- 110610 A77 (3.2- 0.4+) 110626 H10 0.7- 0.6+ 110912 D90 0.5+ 0.1- 110610 H06 0.3+ 0.7+ 110626 H10 0.6- 0.7+ 110912 D90 0.4+ 0.4- 110610 H06 0.3+ 0.4+ 110626 E07 0.2- 0.4- 110912 D90 0.2- 0.1- 110610 H06 0.6+ 0.0 110626 E07 0.6- 0.1- 110920 568 0.0 0.0 110611 H06 0.7+ 0.5+ 110627 104 0.7+ 0.1- 110920 568 0.0 0.0 110611 H06 0.3+ 0.5+ 110627 104 0.3+ 0.0 110920 568 0.0 0.0 110611 F65 0.3- 0.1- 110627 104 0.5+ 0.0 111016 E10 0.1+ 0.1- 110611 F65 0.0 0.1- 110627 213 0.0 0.3+ 111016 E10 0.1+ 0.0 110618 H06 0.4+ 0.1+ 110627 213 0.2+ 0.0 111016 E10 0.0 0.1- 110618 H06 0.5+ 0.0 110627 215 0.7+ 0.3+ 111016 E10 0.0 0.2- 110618 H06 0.7+ 0.0 110627 215 1.0+ 0.2+ 110618 J01 0.7+ 0.1+ 110627 213 0.2+ 0.2- ( ) -------- Rejected Obs. Minimum distance to the Earth will be 1.10 AU on 2013 Mar. 5 UT. The comet will become a brighter object at that time. At Morning twilight: 2013/ (2000) Daily motion Elong. Phase m1 VJn 0h TT h m , AU AU , h A Mar. 24 00 34.50 +24 58.6 1.210 0.508 91.0/357 24.3 53.7 2.5 -5.8 233.6 29 00 32.53 +32 32.8 1.251 0.618 78.9/356 29.3 52.1 3.4 +1.6 230.1 Apr. 3 00 30.27 +39 06.3 1.292 0.729 70.5/356 34.1 50.4 4.2 +8.1 227.1 8 00 27.96 +44 58.1 1.334 0.836 64.6/356 38.8 48.6 4.8 +13.8 224.0 13 00 25.54 +50 20.3 1.375 0.941 60.3/356 43.2 46.8 5.4 +18.8 220.9 18 00 22.81 +55 20.9 1.417 1.043 57.1/355 47.4 45.1 5.9 +23.3 217.5 23 00 19.42 +60 05.1 1.459 1.142 54.6/354 51.3 43.4 6.4 +27.3 213.9 28 00 14.83 +64 36.1 1.502 1.238 52.5/352 55.0 41.7 6.8 +30.8 209.9 May 3 00 08.13 +68 55.8 1.546 1.332 50.8/350 58.4 40.1 7.2 +33.7 205.6 8 23 57.62 +73 04.6 1.592 1.424 49.3/346 61.6 38.6 7.5 +36.2 200.9 13 23 39.75 +77 01.2 1.641 1.513 47.8/340 64.6 37.1 7.9 +38.1 195.9 18 23 06.15 +80 40.1 1.691 1.601 46.4/330 67.3 35.7 8.2 +39.5 190.7 23 21 54.63 +83 43.3 1.745 1.687 45.0/311 69.7 34.3 8.5 +40.2 185.3 28 19 28.24 +85 13.3 1.801 1.771 43.6/272 71.9 32.9 8.8 +40.3 180.0 June 2 16 55.94 +84 06.7 1.861 1.853 42.1/232 73.7 31.7 9.0 +39.7 174.8 7 15 39.73 +81 29.4 1.924 1.934 40.7/211 75.3 30.5 9.3 +38.6 170.1 12 15 04.88 +78 27.0 1.991 2.014 39.2/200 76.6 29.4 9.5 +36.9 165.8 17 14 47.35 +75 20.1 2.061 2.092 37.7/193 77.6 28.3 9.8 +34.6 162.1 22 14 38.03 +72 15.6 2.134 2.170 36.2/188 78.3 27.3 10.0 +31.9 159.1 27 14 33.16 +69 16.0 2.211 2.246 34.8/184 78.7 26.4 10.2 +28.8 156.8 At Evening twilight: 2013/ (2000) Daily motion Elong. Phase m1 VI 0h TT h m , AU AU , h A Mar. 9 00 18.01 -08 08.5 1.105 0.304 160.8/ 15 15.5 60.9 0.0 -8.3 85.9 14 00 31.81 +04 48.8 1.133 0.324 133.6/ 4 15.9 56.9 0.4 -2.9 98.0 19 00 35.22 +15 55.1 1.170 0.404 108.7/359 19.4 55.1 1.4 -0.4 110.0 24 00 34.50 +24 58.6 1.210 0.508 91.0/357 24.3 53.7 2.5 +0.6 120.7 29 00 32.53 +32 32.8 1.251 0.618 78.9/356 29.3 52.1 3.4 +1.2 130.3 Apr. 3 00 30.27 +39 06.3 1.292 0.729 70.5/356 34.1 50.4 4.2 +1.9 138.8 8 00 27.96 +44 58.1 1.334 0.836 64.6/356 38.8 48.6 4.8 +2.9 146.4 13 00 25.54 +50 20.3 1.375 0.941 60.3/356 43.2 46.8 5.4 +4.4 153.4 18 00 22.81 +55 20.9 1.417 1.043 57.1/355 47.4 45.1 5.9 +6.3 159.6 23 00 19.42 +60 05.1 1.459 1.142 54.6/354 51.3 43.4 6.4 +8.8 165.3 28 00 14.83 +64 36.1 1.502 1.238 52.5/352 55.0 41.7 6.8 +11.7 170.2 May 3 00 08.13 +68 55.8 1.546 1.332 50.8/350 58.4 40.1 7.2 +15.0 174.6 8 23 57.62 +73 04.6 1.592 1.424 49.3/346 61.6 38.6 7.5 +18.6 178.3 13 23 39.75 +77 01.2 1.641 1.513 47.8/340 64.6 37.1 7.9 +22.6 181.3 18 23 06.15 +80 40.1 1.691 1.601 46.4/330 67.3 35.7 8.2 +26.7 183.6 23 21 54.63 +83 43.3 1.745 1.687 45.0/311 69.7 34.3 8.5 +30.9 185.1 28 19 28.24 +85 13.3 1.801 1.771 43.6/272 71.9 32.9 8.8 +35.1 185.8 June 2 16 55.94 +84 06.7 1.861 1.853 42.1/232 73.7 31.7 9.0 +39.2 185.7 7 15 39.73 +81 29.4 1.924 1.934 40.7/211 75.3 30.5 9.3 +43.2 184.7 12 15 04.88 +78 27.0 1.991 2.014 39.2/200 76.6 29.4 9.5 +46.9 182.8 17 14 47.35 +75 20.1 2.061 2.092 37.7/193 77.6 28.3 9.8 +50.2 179.8 22 14 38.03 +72 15.6 2.134 2.170 36.2/188 78.3 27.3 10.0 +53.0 175.9 27 14 33.16 +69 16.0 2.211 2.246 34.8/184 78.7 26.4 10.2 +55.3 171.1 m1 = 5.0 + 5 log + 10.0 log Lati.= 35.5

Associate of Central Bureau for Astronomical Telegrams Syuichi Nakano 2011 Nov. 26

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