From: Donald.K.Yeomans@ccmail.jpl.nasa.gov Date: 27 Mar 96 24:27:00 -0700 To: cpc@astro.umd.edu, DOMI@mesioa.obspm.fr, weaver@ari.net, mmumma@lepvax.gsfc.nasa.gov, rwest@eso.org Orbit and Ephemeris Updates for Comet 1996 B2 Hyakutake Don Yeomans - JPL Mar. 27, 1996 Radar Doppler data for March 24-25 have been provided by Steve Ostro and these data are included in the following orbit. Object: Comet 1996 B2 Hyakutake Ref. Solution: 28 Planetary Ephemeris: DE403 No. Observations: 387 Observation Arc: 1996 Jan 1 - 1996 Mar 26 ---- Optical Residuals ---- RA Dec Total Mean -.035 .001 .035 RMS, unweighted .933 .713 .831 RMS, weighted .812 Normalized RMS .811 No. optical observations: 384 ----- Radar Residuals ----- Delay Doppler Radar+Optical Maximum Residual Difference .000 .205 Normalized RMS .000 2.229 .821 No. Delay, Doppler Obs.: 0, 3 ---- Corrected Elements (J2000): Solution 28 Epoch 2450206.50000 = 1996 May 3.00000 Post-Fit Std.Dev. e .9998932594294906 .0000048994 q .2302035939074638 .0000037598 Tp 2450204.8935575240 .0000618908 1996 May 1.39356 Node 188.04537154542460 .0000507678 w 130.17793285081380 .0007034307 i 124.92310766792740 .0002803312 ---- Elements at other epochs: Epoch (TDB) e q Node w i Tp 1996 Mar 27.0 .99989824 .230212144 188.045201 130.176306 124.922803 1996 May 1.393625 1996 Mar 28.0 .99989744 .230210014 188.045206 130.176642 124.922836 1996 May 1.393596 1996 Mar 29.0 .99989669 .230208519 188.045207 130.176888 124.922838 1996 May 1.393582 1996 Mar 30.0 .99989609 .230207491 188.045205 130.177062 124.922831 1996 May 1.393575 1996 Apr 1.0 .99989532 .230206265 188.045201 130.177274 124.922813 1996 May 1.393567 1996 Apr 27.0 .99989307 .230203595 188.045366 130.177935 124.923110 1996 May 1.393558 e: Eccentricity q: Perihelion passage distance (AU) Node: Longitude of the ascending node (deg.) w: Argument of perihelion (deg.) i: Inclination (deg.) Tp: Perihelion passage time (TDB) The apparent total magnitude predictions in the following ephemeris are rough estimates. The addition of the very powerful radar data reduces the ephemeris uncertainties to about the arc second level for the remainder of March. Ephemeris (with perturbations) for Comet 1996 B2 Hyakutake JPL Ref. orbit No. 28 by D.K. Yeomans, Mar. 27, 1996 Ephemeris output times are UTC (not TT). Date (UT) Hr R.A. J2000 Dec. Delta Deldot r Theta Beta Moon PsAng TMag 1996 Mar 26 00 14 10 41.29 +72 09 09.6 .104 12.790 1.027 103.5 70.8 83 208.3 .2 1996 Mar 26 02 14 06 36.21 +73 35 07.5 .105 14.207 1.025 102.4 71.9 82 207.0 .2 1996 Mar 26 04 14 01 49.81 +74 59 37.9 .106 15.596 1.024 101.3 72.9 80 205.6 .2 1996 Mar 26 06 13 56 11.05 +76 22 30.3 .107 16.955 1.022 100.1 74.0 79 204.0 .2 1996 Mar 26 08 13 49 24.68 +77 43 32.7 .107 18.284 1.020 99.0 75.0 78 202.1 .2 1996 Mar 26 10 13 41 09.21 +79 02 30.5 .108 19.580 1.018 97.9 76.1 77 199.9 .3 1996 Mar 26 12 13 30 53.61 +80 19 04.9 .109 20.842 1.017 96.8 77.1 76 197.2 .3 1996 Mar 26 14 13 17 51.83 +81 32 49.1 .110 22.069 1.015 95.7 78.1 74 193.8 .3 1996 Mar 26 16 13 00 53.97 +82 43 03.5 .111 23.261 1.013 94.7 79.0 73 189.4 .3 1996 Mar 26 18 12 38 12.38 +83 48 45.1 .113 24.418 1.011 93.6 80.0 73 183.7 .3 1996 Mar 26 20 12 07 03.78 +84 48 09.2 .114 25.538 1.009 92.6 80.9 72 175.8 .3 1996 Mar 26 22 11 23 44.57 +85 38 18.9 .115 26.623 1.008 91.6 81.9 71 164.9 .3 1996 Mar 27 00 10 24 52.37 +86 14 35.5 .116 27.671 1.006 90.6 82.7 70 150.1 .4 1996 Mar 27 02 09 12 19.49 +86 31 20.5 .118 28.684 1.004 89.6 83.6 69 132.0 .4 1996 Mar 27 04 07 57 45.98 +86 25 34.2 .119 29.661 1.002 88.7 84.5 69 113.3 .4 1996 Mar 27 06 06 54 42.70 +86 00 17.2 .121 30.604 1.001 87.8 85.3 68 97.5 .4 1996 Mar 27 08 06 07 30.48 +85 21 54.7 .122 31.512 .999 86.9 86.1 68 85.7 .4 1996 Mar 27 10 05 33 31.98 +84 36 01.1 .124 32.387 .997 86.0 86.9 67 77.2 .4 1996 Mar 27 12 05 08 54.60 +83 46 10.1 .125 33.229 .995 85.1 87.7 67 71.0 .5 1996 Mar 27 14 04 50 38.02 +82 54 25.7 .127 34.039 .993 84.3 88.4 66 66.5 .5 1996 Mar 27 16 04 36 41.62 +82 01 59.2 .128 34.818 .992 83.4 89.2 66 63.0 .5 1996 Mar 27 18 04 25 47.08 +81 09 32.7 .130 35.567 .990 82.6 89.9 66 60.3 .5 1996 Mar 27 20 04 17 03.09 +80 17 31.8 .132 36.287 .988 81.8 90.6 66 58.2 .5 1996 Mar 27 22 04 09 55.28 +79 26 12.3 .134 36.978 .986 81.1 91.2 66 56.4 .6 1996 Mar 28 00 04 04 00.03 +78 35 44.3 .135 37.642 .985 80.3 91.9 66 55.0 .6 1996 Mar 28 02 03 59 00.67 +77 46 13.9 .137 38.280 .983 79.6 92.5 66 53.8 .6 1996 Mar 28 04 03 54 45.20 +76 57 45.1 .139 38.892 .981 78.9 93.1 66 52.8 .6 1996 Mar 28 06 03 51 04.75 +76 10 20.1 .141 39.480 .979 78.2 93.7 66 51.9 .7 1996 Mar 28 08 03 47 52.67 +75 24 00.1 .143 40.045 .977 77.5 94.3 66 51.2 .7 1996 Mar 28 10 03 45 03.88 +74 38 45.5 .145 40.586 .976 76.8 94.9 66 50.6 .7 1996 Mar 28 12 03 42 34.40 +73 54 36.1 .147 41.106 .974 76.2 95.4 66 50.0 .7 1996 Mar 28 14 03 40 21.12 +73 11 31.3 .149 41.606 .972 75.6 95.9 66 49.5 .7 1996 Mar 28 16 03 38 21.57 +72 29 30.3 .151 42.085 .970 74.9 96.4 67 49.1 .8 1996 Mar 28 18 03 36 33.72 +71 48 31.9 .153 42.545 .968 74.3 96.9 67 48.7 .8 1996 Mar 28 20 03 34 55.95 +71 08 35.1 .155 42.987 .967 73.7 97.4 67 48.4 .8 1996 Mar 28 22 03 33 26.91 +70 29 38.3 .157 43.411 .965 73.2 97.9 68 48.1 .8 1996 Mar 29 00 03 32 05.48 +69 51 40.3 .159 43.818 .963 72.6 98.3 68 47.8 .8 1996 Mar 29 02 03 30 50.72 +69 14 39.7 .161 44.210 .961 72.1 98.8 69 47.6 .9 1996 Mar 29 04 03 29 41.83 +68 38 34.8 .163 44.586 .959 71.5 99.2 69 47.3 .9 1996 Mar 29 06 03 28 38.16 +68 03 24.3 .165 44.947 .958 71.0 99.6 70 47.1 .9 1996 Mar 29 08 03 27 39.13 +67 29 06.6 .168 45.295 .956 70.5 100.0 70 47.0 .9 1996 Mar 29 10 03 26 44.24 +66 55 40.3 .170 45.628 .954 70.0 100.4 71 46.8 .9 1996 Mar 29 12 03 25 53.07 +66 23 03.9 .172 45.949 .952 69.5 100.7 71 46.7 1.0 1996 Mar 29 14 03 25 05.24 +65 51 15.9 .174 46.258 .950 69.0 101.1 72 46.6 1.0 1996 Mar 29 16 03 24 20.45 +65 20 15.0 .176 46.555 .949 68.6 101.4 73 46.4 1.0 1996 Mar 29 18 03 23 38.39 +64 49 59.7 .179 46.841 .947 68.1 101.8 73 46.3 1.0 1996 Mar 29 20 03 22 58.83 +64 20 28.7 .181 47.116 .945 67.7 102.1 74 46.3 1.0 1996 Mar 29 22 03 22 21.55 +63 51 40.6 .183 47.380 .943 67.2 102.4 75 46.2 1.1 1996 Mar 30 00 03 21 46.34 +63 23 34.2 .186 47.635 .941 66.8 102.7 75 46.1 1.1 1996 Mar 30 12 03 18 50.22 +60 48 21.6 .200 48.980 .930 64.4 104.4 80 45.8 1.2 1996 Mar 31 00 03 16 37.56 +58 33 19.8 .214 50.064 .919 62.3 105.8 85 45.6 1.3 1996 Mar 31 12 03 14 53.44 +56 35 05.3 .228 50.946 .908 60.4 107.0 90 45.5 1.4 1996 Apr 1 00 03 13 28.97 +54 50 52.0 .243 51.671 .897 58.7 107.9 95 45.5 1.5 1996 Apr 1 12 03 12 18.56 +53 18 24.7 .258 52.272 .886 57.1 108.7 101 45.5 1.5 1996 Apr 2 00 03 11 18.46 +51 55 53.4 .273 52.775 .875 55.7 109.4 107 45.5 1.6 1996 Apr 2 12 03 10 26.13 +50 41 48.1 .289 53.199 .864 54.4 109.9 112 45.5 1.7 1996 Apr 3 00 03 09 39.72 +49 34 54.7 .304 53.561 .853 53.1 110.3 118 45.5 1.7 1996 Apr 3 12 03 08 57.90 +48 34 12.2 .320 53.872 .841 51.9 110.7 124 45.4 1.8 1996 Apr 4 00 03 08 19.66 +47 38 49.7 .335 54.142 .830 50.8 110.9 129 45.4 1.8 1996 Apr 4 12 03 07 44.22 +46 48 04.7 .351 54.377 .819 49.8 111.1 135 45.3 1.9 1996 Apr 5 00 03 07 10.99 +46 01 21.4 .367 54.584 .807 48.8 111.3 140 45.2 1.9 1996 Apr 5 12 03 06 39.49 +45 18 09.4 .382 54.768 .796 47.8 111.3 144 45.1 1.9 1996 Apr 6 00 03 06 09.33 +44 38 02.9 .398 54.933 .784 46.9 111.4 148 45.0 1.9 1996 Apr 6 12 03 05 40.19 +44 00 39.8 .414 55.081 .773 46.0 111.4 151 44.9 2.0 1996 Apr 7 00 03 05 11.82 +43 25 40.9 .430 55.216 .761 45.1 111.3 152 44.7 2.0 1996 Apr 7 12 03 04 44.00 +42 52 49.6 .446 55.341 .750 44.3 111.2 151 44.6 2.0 1996 Apr 8 00 03 04 16.53 +42 21 51.6 .462 55.456 .738 43.4 111.1 149 44.4 2.0 1996 Apr 8 12 03 03 49.26 +41 52 34.1 .478 55.563 .726 42.6 110.9 145 44.2 2.0 1996 Apr 9 00 03 03 22.05 +41 24 46.0 .494 55.664 .714 41.8 110.7 141 44.0 2.0 1996 Apr 9 12 03 02 54.77 +40 58 17.4 .510 55.760 .702 41.1 110.4 136 43.7 2.0 1996 Apr 10 00 03 02 27.31 +40 32 59.5 .526 55.852 .690 40.3 110.1 130 43.5 2.0 1996 Apr 10 12 03 01 59.58 +40 08 44.4 .542 55.941 .678 39.6 109.8 124 43.2 2.0 1996 Apr 11 00 03 01 31.48 +39 45 24.9 .559 56.027 .666 38.8 109.5 118 42.9 2.0 1996 Apr 11 12 03 01 02.93 +39 22 54.7 .575 56.111 .654 38.1 109.1 111 42.6 2.0 1996 Apr 12 00 03 00 33.85 +39 01 07.8 .591 56.194 .642 37.4 108.7 105 42.3 1.9 1996 Apr 12 12 03 00 04.18 +38 39 58.9 .607 56.276 .630 36.6 108.3 98 42.0 1.9 1996 Apr 13 00 02 59 33.83 +38 19 22.9 .623 56.357 .618 35.9 107.8 92 41.6 1.9 1996 Apr 13 12 02 59 02.75 +37 59 15.3 .640 56.438 .606 35.2 107.3 85 41.2 1.9 1996 Apr 14 00 02 58 30.86 +37 39 31.6 .656 56.518 .593 34.5 106.7 78 40.8 1.8 1996 Apr 14 12 02 57 58.12 +37 20 07.8 .672 56.599 .581 33.8 106.1 72 40.4 1.8 1996 Apr 15 00 02 57 24.46 +37 01 00.1 .689 56.679 .568 33.1 105.5 65 40.0 1.7 1996 Apr 15 12 02 56 49.81 +36 42 04.5 .705 56.760 .556 32.4 104.8 59 39.5 1.7 1996 Apr 16 00 02 56 14.12 +36 23 17.6 .722 56.840 .543 31.7 104.1 52 39.0 1.6 1996 Apr 16 12 02 55 37.33 +36 04 35.9 .738 56.919 .531 31.0 103.4 46 38.5 1.6 1996 Apr 17 00 02 54 59.39 +35 45 55.8 .754 56.997 .518 30.3 102.6 40 38.0 1.5 1996 Apr 17 12 02 54 20.23 +35 27 13.9 .771 57.073 .506 29.5 101.7 34 37.4 1.5 1996 Apr 18 00 02 53 39.80 +35 08 26.9 .787 57.147 .493 28.8 100.8 29 36.8 1.4 1996 Apr 18 12 02 52 58.03 +34 49 31.1 .804 57.217 .480 28.1 99.8 25 36.2 1.3 1996 Apr 19 00 02 52 14.88 +34 30 23.2 .820 57.281 .468 27.4 98.8 21 35.6 1.3 1996 Apr 19 12 02 51 30.28 +34 10 59.6 .837 57.337 .455 26.7 97.7 20 34.9 1.2 1996 Apr 20 00 02 50 44.17 +33 51 16.4 .854 57.384 .442 25.9 96.5 20 34.2 1.1 R.A. J2000 Dec. = Geocentric astrometric right ascension and declination referred to the mean equator and equinox of J2000. Light time corrections have been applied Delta = Geocentric distance of object in AU Deldot = Geocentric radial velocity of object in km/s r = Heliocentric distance of object in AU Theta = Sun-Earth-Object angle in degrees Beta = Sun-Object-Earth angle in degrees Moon = Object-Earth-Moon angle in degrees PsAng = Position angle of extended radius vector in degrees TMag = Approximate Total magnitude = 5.0 + 5.0*log(Delta) + 10.0*log(r) --JPLxxxccMailxxxSMTPxxxID13477gc46x--