SJAA

Ephemeris

Comet Comments

Don Machholz


Both Periodic Comet Jager and Periodic Comet Harrington-Abell can be found against the background of the Winter Milky Way. Also up nearly all night long are Comets Linear (1998 M5) and Williams.

C/1998 X1 (ODAS): This comet was discovered by a German Asteroid Survey on Dec. 15. It remains faint.

P/1988 VS24 (LINEAR): Here's another instance of an object being identified as a comet after appearing as an asteroid at discovery. This comet orbits the sun every nine years, with a perihelion distance of 3.4 AU.

C/1998 Y1 (LINEAR): Found on Dec. 22 by the LINEAR program, this comet will remain faint.

P/1998 Y2 (Li): The Lick Observatory Supernova Search program imaged this comet in the field of NGC 1041. It was found by Weidong Li. The comet orbits the sun every 15 years and remains faint.

COMET HUNTING NOTES: In which month do amateur astronomers visually discover the most comets? Of the 79 comets found in the past 24 years, 12 were found in July while 10 were found in January. In last place is both February and April with three finds each.

Ephemerides -- Epoch 2000, Oh UTC

C/1998 M5 (LINEAR)
Date      R.A. (2000)       Dec          El    Sky       Mag
01-12   19h02.9m        +44 deg 45'   67 deg   M         9.3
01-17   19h06.2m        +46 deg 41'   68 deg   M         9.2
01-22   19h09.6m        +48 deg 53'   70 deg   M         9.2
01-27   19h13.1m        +51 deg 21'   72 deg   M         9.1
02-01   19h16.9m        +54 deg 07'   75 deg   M         9.1
02-06   19h20.7m        +57 deg 12'   77 deg   M         9.0
02-11   19h24.7m        +60 deg 37'   79 deg   M         9.0
02-16   19h28.9m        +64 deg 21'   82 deg   M         9.0
02-21   19h33.2m        +68 deg 26'   84 deg   M         9.0
02-26   19h37.8m        +72 deg 49'   87 deg   M         9.0
03-03   19h42.9m        +77 deg 30'   89 deg   M         9.0
03-08   19h49.2m        +82 deg 24'   90 deg   M         9.0

C/1998 P1 (Williams)
Date      R.A. (2000)      Dec         El     Sky       Mag
01-12   12h21.2m        +03 deg 34' 108 deg    M       10.3
01-17   12h04.7m        +08 deg 13' 118 deg    M       10.3
01-22   11h44.9m        +13 deg 22' 130 deg    M       10.4
01-27   11h21.7m        +18 deg 49' 141 deg    M       10.4
02-01   10h55.4m        +24 deg 13' 151 deg    M       10.6
02-06   10h26.8m        +29 deg 08' 159 deg    M       10.8
02-11   09h57.4m        +33 deg 16' 160 deg    M       11.0
02-16   09h28.7m        +36 deg 27' 155 deg    E       11.2
02-21   09h02.1m        +38 deg 44' 148 deg    E       11.5
02-26   08h38.7m        +40 deg 15' 140 deg    E       11.8
03-03   08h18.7m        +41 deg 11' 132 deg    E       12.1
03-08   08h02.3m        +41 deg 43' 124 deg    E       12.4

P/1998 U3 (Jager)
Date      R.A. (2000)      Dec         El     Sky      Mag
01-12   06h29.3m        +35 deg 44' 160 deg    E       10.5
01-17   06h25.7m        +34 deg 38' 156 deg    E       10.5
01-22   06h22.8m        +33 deg 28' 152 deg    E       10.5
01-27   06h20.6m        +32 deg 17' 147 deg    E       10.5
02-01   06h19.3m        +31 deg 05' 142 deg    E       10.5
02-06   06h19.0m        +29 deg 53' 137 deg    E       10.5
02-11   06h19.5m        +28 deg 42' 132 deg    E       10.6
02-16   06h20.9m        +27 deg 34' 127 deg    E       10.6
02-21   06h23.1m        +26 deg 27' 123 deg    E       10.7
02-26   06h26.2m        +25 deg 24' 119 deg    E       10.7
03-03   06h30.0m        +24 deg 22' 115 deg    E       10.8
03-08   06h34.5m        +23 deg 23' 111 deg    E       10.8

52P/Harrington-Abell
Date      R.A. (2000)      Dec         El     Sky      Mag
01-12   07h12.0m        +39 deg 46' 162 deg    E       10.5
01-17   07h09.0m        +39 deg 03' 159 deg    E       10.5
01-22   07h06.4m        +38 deg 13' 156 deg    E       10.5
01-27   07h04.6m        +37 deg 16' 153 deg    E       10.6
02-01   07h03.7m        +36 deg 13' 149 deg    E       10.6
02-06   07h03.8m        +35 deg 07' 145 deg    E       10.7
02-11   07h04.9m        +33 deg 58' 140 deg    E       10.7
02-16   07h07.0m        +32 deg 49' 136 deg    E       10.8
02-21   07h10.1m        +31 deg 38' 132 deg    E       10.9
02-26   07h14.1m        +30 deg 28' 129 deg    E       11.0
03-03   07h18.9m        +29 deg 19' 125 deg    E       11.1
03-08   07h24.5m        +28 deg 11' 121 deg    E       11.2

Orbital Elements

Object:		Williams	LINEAR (M5)
Peri. Date:	1998 10 17.838	1999 01 24.5733
Peri. Dist(AU):	1.14674 AU	1.742213 AU
Arg/Peri(2000):	294.473 deg.	101.2873 deg.
Asc. Node(2000)	156.379 deg.	333.3766 deg.
Incl (2000):	145.730 deg.	082.2285 deg.
Eccen:		1.0 		1.0
Orbital Perio	Long Period 	Long Period
Ref:		MPEC 32410	MPC 32410
Epoch:		1998 10 17	1999 01 22
Absol. Mag/"n":	7.5/4.0 	5.5/4.0

Object:		Harrington-Abell	Jager
Peri. Date:	1999 01 27.8772		1999 03 07.7714
Peri. Dist(AU):	1.755993 AU		2.152631 AU
Arg/Peri(2000):	138.8996 deg.		179.4942 deg.
Asc.Node(2000):	337.2882 deg.		303.8178 deg.
Incl (2000):	010.2186 deg.	 	019.0944 deg.
Eccen:		0.542909	 	0.652672
Orbital Period:	7.53 years		15.4 years
Ref:	 	MPC 32595	 	MPC 32866
Epoch		1999 01 22		1999 03 08
Absol. Mag/"n":	8.6/4.0			6.5/4.0


Don Machholz; last updated: 1999 Jan 18 Prev Next