From: j.jahn@abbs.hanse.de (Jost Jahn)
Newsgroups: sci.astro
Subject: Comets daily 1992 Aug. 31 - Sep. 07.
Date: 23 Aug 92 17:29:05 GMT
Reply-To: j.jahn@abbs.hanse.de
Distribution: sci
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Daily comet ephemerides for the period: Monday, 1992 Aug. 31 - Sep. 07, 0 h UT
(Universal Time). Due to e-mail problems the posting of the five different
ephemerides has to be made on three days. All known comets are included in the
list which meet the following criteria: the minimum elongation to the sun has
to exceeds 15 degrees, the minimum distance to the earth has to be lower than
0.15 astronomical units (A.U.) and the limiting magnitude of the comet is
brighter than 15.5 mag.

Please note, that magnitude predictions for comets tend to be very inaccurate,
thus comets may actually be fainter or brighter than given! Also remember that
comets are diffuse objects. Thus, a comet with a magnitude of 12 mag may be
only observable if the faintest stars visible in your telescope are 14 mag or
fainter. Try first low power for very diffuse comets and than switch to high
powers for more condensated ones. Comet filter may increase comet visibility in
many but not in all cases.

The position are given for 1950.0 and 2000.0. The elements of the orbits are
from the latest MPC or from a more recent IAUC. A list of the used elements is
given at the end of the ephemerides.

Name of the comet     Rect(1950)Decl Rect(2000)Decl  r    d   Elo Magn MotioPos
[P/] Name [Pro/Fin]    h   m    o  '  h   m    o  ' A.U. A.U.  o  Step  "/h  o
----------------------------- Monday, 1992 Aug. 31 ----------------------------
Shoemaker-Lev (1991d) 19:53.0 +22:06 19:55.1 +22:14 3.49 2.76 130 13.0 60.8/195
Helin-Lawrenc (1991l)  1:19.6 +14:45  1:22.3 +15:01 3.22 2.45 133 13.2 63.1/283
Zanotta-Brew (1991g1) 13:34.2 -34:08 13:37.0 -34:23 3.39 3.77  60 14.0 41.4/ 87
Tanaka-Machho (1992d)  9:12.0 +40:02  9:15.1 +39:49 2.25 2.98  36 10.2 43.6/137
Bradfield (1992i)      8:46.9 +30:15  8:49.9 +30:04 1.91 2.67  33 15.4 20.1/ 30
Machholz (1992k)       8:07.2 - 8:23  8:09.7 - 8:32 1.24 1.81  41 11.2  139/137
P/Grigg-Skjellerup    14:07.6 + 0:00 14:10.1 - 0:14 1.14 1.40  53 15.1  170/ 98
Shoemaker-Le (1991a1) 12:10.6 -14:29 12:13.2 -14:45 1.08 1.78  33  9.8  104/180
P/Shoemak (1984XVIII)  5:21.3 +13:39  5:24.2 +13:41 1.36 1.17  77 15.3  106/ 63
P/Schuster (1978I)     5:23.6 +20:04  5:26.6 +20:06 1.54 1.44  76 13.6  106/ 68
P/Giclas (1992l)       3:38.3 + 9:09  3:41.0 + 9:18 1.85 1.35 103 14.2 60.2/ 86
P/Ciffreo              0:06.0 -23:32  0:08.5 -23:16 2.17 1.22 154 15.5 23.7/232
P/Ashbrook-Ja (1992j) 16:09.1 -34:21 16:12.3 -34:29 3.11 2.95  90 14.7 26.2/ 82
---------------------------- Tuesday, 1992 Sep. 01 ----------------------------
Shoemaker-Lev (1991d) 19:52.5 +21:43 19:54.7 +21:51 3.50 2.77 129 13.0 60.4/194
Helin-Lawrenc (1991l)  1:17.9 +14:51  1:20.5 +15:06 3.23 2.45 134 13.2 63.5/282
Zanotta-Brew (1991g1) 13:35.5 -34:07 13:38.4 -34:22 3.40 3.79  60 14.0 42.7/ 87
Tanaka-Machho (1992d)  9:13.0 +39:49  9:16.2 +39:37 2.26 2.99  37 10.2 43.1/137
Bradfield (1992i)      8:47.2 +30:22  8:50.2 +30:11 1.92 2.67  34 15.5 20.1/ 28
Machholz (1992k)       8:09.8 - 9:03  8:12.2 - 9:12 1.25 1.82  41 11.3  137/137
P/Grigg-Skjellerup    14:12.1 - 0:10 14:14.6 - 0:24 1.14 1.40  54 15.1  169/ 98
Shoemaker-Le (1991a1) 12:10.8 -15:06 12:13.4 -15:22 1.09 1.80  33  9.8  101/180
P/Shoemak (1984XVIII)  5:23.9 +13:58  5:26.7 +14:01 1.36 1.16  77 15.3  105/ 63
P/Schuster (1978I)     5:26.4 +20:20  5:29.4 +20:22 1.54 1.43  76 13.6  105/ 68
P/Giclas (1992l)       3:39.9 + 9:11  3:42.6 + 9:20 1.85 1.34 103 14.1 59.5/ 86
P/Ciffreo              0:05.4 -23:38  0:08.0 -23:21 2.17 1.21 154 15.5 24.3/233
P/Ashbrook-Ja (1992j) 16:09.9 -34:20 16:13.2 -34:28 3.11 2.96  89 14.7 26.8/ 82
--------------------------- Wednesday, 1992 Sep. 02 ---------------------------
Shoemaker-Lev (1991d) 19:52.1 +21:19 19:54.3 +21:27 3.50 2.78 129 13.0 60.0/194
Helin-Lawrenc (1991l)  1:16.1 +14:56  1:18.8 +15:12 3.24 2.44 136 13.2 64.8/282
Zanotta-Brew (1991g1) 13:36.9 -34:06 13:39.8 -34:21 3.41 3.82  59 14.0 41.8/ 87
Tanaka-Machho (1992d)  9:14.0 +39:37  9:17.2 +39:24 2.27 2.99  37 10.3 42.5/137
Machholz (1992k)       8:12.3 - 9:43  8:14.7 - 9:52 1.26 1.83  42 11.3  136/137
P/Grigg-Skjellerup    14:16.5 - 0:19 14:19.1 - 0:33 1.15 1.41  54 15.2  169/ 98
Shoemaker-Le (1991a1) 12:11.1 -15:42 12:13.7 -15:58 1.11 1.82  32  9.9 68.8/150
P/Shoemak (1984XVIII)  5:26.5 +14:17  5:29.3 +14:20 1.36 1.16  78 15.3  105/ 63
P/Schuster (1978I)     5:29.2 +20:36  5:32.2 +20:38 1.54 1.42  76 13.6  105/ 68
P/Giclas (1992l)       3:41.5 + 9:12  3:44.2 + 9:22 1.85 1.33 104 14.1 58.7/ 86
P/Ciffreo              0:04.8 -23:44  0:07.4 -23:27 2.16 1.20 155 15.4 24.8/235
P/Ashbrook-Ja (1992j) 16:10.8 -34:19 16:14.1 -34:26 3.10 2.97  88 14.7 27.4/ 83
---------------------------- Thursday, 1992 Sep. 03 ---------------------------
Shoemaker-Lev (1991d) 19:51.7 +20:56 19:53.9 +21:04 3.51 2.79 128 13.1 59.7/193
Helin-Lawrenc (1991l)  1:14.4 +15:01  1:17.0 +15:17 3.25 2.44 137 13.2 65.3/281
Zanotta-Brew (1991g1) 13:38.3 -34:05 13:41.1 -34:20 3.42 3.84  58 14.0 40.2/ 87
Tanaka-Machho (1992d)  9:15.0 +39:25  9:18.2 +39:12 2.28 2.99  38 10.3 41.9/137
Machholz (1992k)       8:14.9 -10:22  8:17.3 -10:32 1.28 1.83  42 11.4  135/137
P/Grigg-Skjellerup    14:21.0 - 0:29 14:23.5 - 0:42 1.16 1.41  54 15.2  168/ 98
Shoemaker-Le (1991a1) 12:11.2 -16:19 12:13.8 -16:36 1.12 1.84  32  9.9 97.0/180
P/Shoemak (1984XVIII)  5:29.0 +14:37  5:31.9 +14:39 1.37 1.16  78 15.4  104/ 63
P/Schuster (1978I)     5:32.0 +20:51  5:35.0 +20:53 1.54 1.42  77 13.6  105/ 68
P/Giclas (1992l)       3:43.1 + 9:14  3:45.8 + 9:23 1.85 1.32 104 14.1 57.9/ 86
P/Ciffreo              0:04.2 -23:50  0:06.8 -23:33 2.16 1.20 155 15.4 25.4/237
P/Ashbrook-Ja (1992j) 16:11.7 -34:17 16:14.9 -34:25 3.10 2.98  87 14.7 28.0/ 83
----------------------------- Friday, 1992 Sep. 04 ----------------------------
Shoemaker-Lev (1991d) 19:51.3 +20:33 19:53.5 +20:41 3.52 2.81 128 13.1 59.4/192
Helin-Lawrenc (1991l)  1:12.6 +15:06  1:15.3 +15:22 3.26 2.44 138 13.2 65.9/281
Zanotta-Brew (1991g1) 13:39.6 -34:05 13:42.5 -34:20 3.43 3.86  58 14.0 41.9/ 88
Tanaka-Machho (1992d)  9:16.0 +39:12  9:19.2 +38:60 2.29 3.00  38 10.3 41.3/137
Machholz (1992k)       8:17.4 -11:01  8:19.7 -11:11 1.29 1.84  42 11.4  133/137
P/Grigg-Skjellerup    14:25.4 - 0:38 14:27.9 - 0:52 1.16 1.42  54 15.2  167/ 98
Shoemaker-Le (1991a1) 12:11.4 -16:54 12:14.0 -17:10 1.13 1.86  31 10.0 95.1/180
P/Shoemak (1984XVIII)  5:31.5 +14:56  5:34.4 +14:58 1.37 1.16  78 15.4  103/ 63
P/Schuster (1978I)     5:34.7 +21:07  5:37.7 +21:09 1.54 1.41  77 13.6  105/ 68
P/Giclas (1992l)       3:44.7 + 9:16  3:47.4 + 9:25 1.85 1.31 105 14.1 57.1/ 86
P/Ciffreo              0:03.6 -23:55  0:06.1 -23:38 2.15 1.19 156 15.4 25.9/239
P/Ashbrook-Ja (1992j) 16:12.6 -34:16 16:15.9 -34:24 3.09 2.99  86 14.7 28.6/ 83
---------------------------- Saturday, 1992 Sep. 05 ---------------------------
Shoemaker-Lev (1991d) 19:51.0 +20:10 19:53.2 +20:18 3.53 2.82 127 13.1 59.0/192
Helin-Lawrenc (1991l)  1:10.8 +15:11  1:13.5 +15:27 3.27 2.44 139 13.2 65.8/280
Zanotta-Brew (1991g1) 13:41.0 -34:04 13:43.9 -34:19 3.44 3.89  57 14.1 40.0/ 88
Tanaka-Machho (1992d)  9:17.0 +39:00  9:20.1 +38:48 2.30 3.00  39 10.3 40.7/137
Machholz (1992k)       8:19.8 -11:40  8:22.2 -11:50 1.30 1.85  43 11.5  132/137
P/Grigg-Skjellerup    14:29.8 - 0:48 14:32.4 - 1:01 1.17 1.42  54 15.3  167/ 98
Shoemaker-Le (1991a1) 12:11.6 -17:28 12:14.2 -17:44 1.14 1.88  31 10.0 93.4/180
P/Shoemak (1984XVIII)  5:34.1 +15:15  5:36.9 +15:17 1.37 1.15  79 15.4  102/ 62
P/Schuster (1978I)     5:37.5 +21:23  5:40.5 +21:24 1.54 1.41  77 13.5  104/ 68
P/Giclas (1992l)       3:46.2 + 9:17  3:48.9 + 9:26 1.85 1.30 105 14.1 56.3/ 87
P/Ciffreo              0:02.9 -24:00  0:05.5 -23:44 2.15 1.18 156 15.3 26.4/240
P/Ashbrook-Ja (1992j) 16:13.5 -34:15 16:16.8 -34:22 3.09 3.00  86 14.7 29.2/ 84
----------------------------- Sunday, 1992 Sep. 06 ----------------------------
Shoemaker-Lev (1991d) 19:50.6 +19:47 19:52.9 +19:55 3.53 2.83 127 13.1 58.6/191
Helin-Lawrenc (1991l)  1:09.0 +15:15  1:11.7 +15:31 3.28 2.44 141 13.2 65.9/279
Zanotta-Brew (1991g1) 13:42.3 -34:04 13:45.2 -34:19 3.46 3.91  56 14.1 43.4/ 88
Tanaka-Machho (1992d)  9:17.9 +38:49  9:21.1 +38:36 2.31 3.00  39 10.3 40.2/137
Machholz (1992k)       8:22.3 -12:19  8:24.6 -12:28 1.31 1.86  43 11.5  131/137
P/Grigg-Skjellerup    14:34.2 - 0:57 14:36.7 - 1:10 1.18 1.43  55 15.3  166/ 98
Shoemaker-Le (1991a1) 12:11.8 -18:03 12:14.3 -18:20 1.15 1.90  31 10.1 91.5/180
P/Shoemak (1984XVIII)  5:36.5 +15:34  5:39.4 +15:36 1.38 1.15  79 15.4  101/ 62
P/Schuster (1978I)     5:40.3 +21:38  5:43.3 +21:40 1.54 1.40  78 13.5  104/ 68
P/Giclas (1992l)       3:47.7 + 9:19  3:50.4 + 9:28 1.85 1.30 106 14.1 55.5/ 87
P/Ciffreo              0:02.3 -24:05  0:04.8 -23:49 2.14 1.18 157 15.3 26.9/242
P/Ashbrook-Ja (1992j) 16:14.5 -34:14 16:17.7 -34:21 3.09 3.01  85 14.7 29.7/ 84
----------------------------- Monday, 1992 Sep. 07 ----------------------------
Shoemaker-Lev (1991d) 19:50.3 +19:24 19:52.5 +19:32 3.54 2.85 126 13.2 58.1/190
Helin-Lawrenc (1991l)  1:07.2 +15:20  1:09.8 +15:36 3.29 2.44 142 13.2 68.0/280
Zanotta-Brew (1991g1) 13:43.7 -34:03 13:46.6 -34:18 3.47 3.93  56 14.1 43.2/ 89
Tanaka-Machho (1992d)  9:18.9 +38:37  9:22.0 +38:24 2.32 3.01  40 10.3 39.6/137
Machholz (1992k)       8:24.7 -12:57  8:27.1 -13:07 1.33 1.87  43 11.6  130/137
P/Grigg-Skjellerup    14:38.5 - 1:07 14:41.1 - 1:19 1.18 1.43  55 15.4  165/ 98
Shoemaker-Le (1991a1) 12:12.0 -18:36 12:14.6 -18:52 1.16 1.92  30 10.1 89.8/180
P/Shoemak (1984XVIII)  5:39.0 +15:53  5:41.9 +15:54 1.38 1.15  79 15.4  101/ 62
P/Schuster (1978I)     5:43.1 +21:54  5:46.1 +21:55 1.54 1.39  78 13.5  104/ 68
P/Giclas (1992l)       3:49.2 + 9:20  3:51.9 + 9:29 1.85 1.29 107 14.0 54.7/ 87
P/Ciffreo              0:01.5 -24:10  0:04.1 -23:54 2.14 1.17 157 15.3 27.4/244
P/Ashbrook-Ja (1992j) 16:15.4 -34:13 16:18.7 -34:20 3.08 3.02  84 14.7 30.3/ 84


Used orbital elements (2000.0).
Name of comet     Perihel. T   Perih.q Eccentr Perihel   Node   Inclin   H    G
[P/] Name [Pr/Fi] Ye Mo Day      A.U.      e   Degrees Degrees Degrees Magn   -
-------------------------------------------------------------------------------
Shoemaker (1991d) 91 12 31.186 2.26499 0.99349  74.367 145.129  77.288  4.7 4.5
Helin-Law (1991l) 92 01 20.028 1.51771 1.00042 271.160  11.835  95.457 11.3 0.0
Zanotta- (1991g1) 92 01 31.991 0.64397 1.00005 197.872 254.909  50.028  9.1 1.5
Tanaka-Ma (1992d) 92 04 22.688 1.26143 0.99551  65.473 300.508  79.295  6.9 1.1
Bradfield (1992i) 92 05 25.794 0.59230 1.00000 299.717 159.998 158.564 10.5 4.0
Machholz (1992k)  92 07 11.058 0.82016 1.00000 163.117 235.136  57.747  9.0 4.0
P/Grigg-Skjelleru 92 07 22.138 0.99469 0.66433 359.265 213.340  21.099 13.5 6.0
Shoemake (1991a1) 92 07 24.509 0.83631 0.99988 145.237  49.050 113.498  8.4 1.8
P/Sho (1984XVIII) 92 08 06.875 1.32710 0.66464 317.642  55.433  21.552 13.0 6.0
P/Schuste (1978I) 92 09 06.428 1.53924 0.58952 355.734  50.603  20.134 10.0 6.0
P/Giclas (1992l)  92 09 13.092 1.84679 0.49321 276.486 112.526   7.284  9.5 6.0
P/Ciffreo         93 01 22.476 1.70876 0.54311 358.041  53.709  13.089 10.0 6.0
P/Ashbroo (1992j) 93 07 14.052 2.31628 0.39491 348.690   2.666  12.501  5.0 6.0

The name is the same as in the ephemerides, but a littlebit shorter. 'Perihel.
T' is the perihelion date as year, month and day. 'Perih.q' is the perihelion
distance q in astronomical units. 'Eccentr e' is the eccentricity of the orbit.
'Perihel', 'Node' and 'Inclin.' are these three orbit angles in degrees. H is
the magnitude of the object in 1 A.U. from the sun and the earth, G is the
factor in the calculation of the objects brightness V = H + 5*log(d) +
2.5*G*log(r). These orbital element list is only for an overview, which orbit I
used. For well-known objects the accuracy of the published original elements
may be some digits better than given here.


Explanations of the columns in the ephemerides:
Name of object    The name of the object. A [P/] before the name of the object
                  means a periodic comet with a period around the sun of lower
                  than 200 years. If the comet have received a final [Fin]
                  designation, it's the name of the year with a roman number in
                  bracketts. If it's a provisional designation [Pro] the number
                  of the year is following by a lower letter, also in
                  bracketts. For more than 26 comets in a year, a running
                  number is in the appendix.
Rect(1950)Decl    The rectascension in hours and time minutes and the
                  declination in degrees and arc minutes for 1950.0.
Rect(2000)Decl    The rectascension in hours and time minutes and the
                  declination in degrees and arc minutes for 2000.0.
r                 The distance of the comet to the sun in A.U.
d                 The distance of the comet to the earth in A.U.
Elo               The elongation of the comet to the sun in degrees.
Magn              The magnitude of the comet in magnitude steps.
MotioPos          The motion of the comet in arc seconds/hour and the position
                  angle of the motion (from north, over east, south and west
                  back to north, 0..360 degrees).

These ephemerides should promote the observing of comets.

These ephemerides were computed by a program of Jost Jahn with an Atari ST
computer.
 
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