The Tracks of the Marsden
Comets in C2 **(and ****here
in C3****)**

**The
Tracks of the Meyer Comets in C2**

**The Tracks of the Kracht Comets in C2**

**The Tracks of the Kracht2 Comets in C2**

**The tracks are drawn
for the 15th day of each month.
The tracks are running from red to blue to gray.
**(Jan, Feb, Mar, Oct, Nov, Dec: left to right)

(Apr, May, Jun; Jul; Aug, Sep: right to left)

Numbers are drawn every 30 minutes.

The numbers give the velocities in pixel/hour for the C2 1024*1024 images.

**The elements used are the weighted means of the
elements of the twelve confirmed Marsden comets **(2002 July)**:**

**q = 0.0487, peri = 23.0, node = 81.9, incl = 26.4 deg
(L = 102.7, B = +10.0).**

**The weights are the lengths of the observation times
(last obs - first obs).**

**C/1998 A2 0.10 days (from
T+0.14 to +0.24 days in C2)
C/1998 A3 0.14 days (from T+0.16 to +0.30 days in C2)
C/1998 A4 0.10 days (from T+0.19 to +0.29 days in C2)
C/1999 J6 1.66 days (from T-0.86 to -0.13 days in C2 and T-0.14
to +0.80 in C3)
C/1999 N5 0.84 days (from T-0.30 to +0.32 days in C2 and T+0.33
to +0.54 in C3)
C/1999 P6 0.25 days (from T-0.05 to +0.20 days in C2)
C/1999 P8 0.23 days (from T+0.01 to +0.24 days in C2)
C/1999 P9 0.36 days (from T+0.19 to +0.55 days in C2)
C/1999 U2 1.28 days (from T-0.77 to -0.39 days in C2 and T-0.01
to +0.51 in C3)
C/2000 C7 0.11 days (from T+0.00 to +0.11 days in C2)
C/2000 C3 0.54 days (from T-0.03 to +0.52 days in C2)
C/2000 C4 0.77 days (from T-0.01 to +0.50 days in C2 and T-0.27
to -0.06 in C3)
**

In C2 the times are from T-0.77 to T+0.55 and in C3 the times are from T-0.14 to T+0.80 days.

Tracks of the known Marsden comets (2002 Mar 18):

C/1998 A2 (1998 January 03 21:07 - 23:32 UTC)
MPEC 2002-E25

Drawn are the mean Marsden orbit for 22:20 UTC and the
measured positions (black circles).

The velocities derived from the positions are 82 (21:07 - 22:07)
and 79 pixel/h (22:07 - 23:32).

This is the fifth member of the Marsden group.

C/1998 A3 (1998 January 09 11:08 - 14:28 UTC) MPEC 2002-E25

Drawn are the mean Marsden orbit for 12:48 UTC and the
measured positions (black circles).

The velocities derived from the positions are 83 (11:08 - 13:05)
and 79 pixel/h (12:16 - 14:28).

This is the sixth member of the Marsden group.

C/1998 A4 (1998 January 10/11 23:28 - 01:57
UTC) MPEC 2002-F70

Drawn are the mean Marsden orbit for 00:42 UTC and the
measured positions (black circles).

The velocities derived from the positions are 85 (23:28 - 00:30)
and 82 pixel/h (00:55 - 01:57).

This seems to be a member of the Marsden group.

C/1999 J6 1999 May 10/11 17:06 - 11:06 UTC in
C2 (MPEC 2000-F30)

all obs: T-0.86 to T+0.80 days

Drawn are the mean Marsden orbit for 02:00 UTC and the measured
positions (black circles).

The velocities derived from the positions are 55 (17:06-18:44),
60 (00:50-03:06)

and 57.5 pixel/h (09:06-11:06).

This is the best observed member of the Marsden group.

It was seen in C3 until 1999 May 12 09:18 UTC.

C/1999 N5 (1999 July 11 09:30 - 13:31 UTC) MPEC
2002-F03

Drawn are the mean Marsden orbit for 11:30 UTC and the
measured positions (black circles).

The velocities derived from the positions are 70 (09:30-10:30)
and 66 pixel/h (12:30-13:31).

It was seen in C2 from July 10 22:30 and in C3 until 1999 July 11
18:42 UTC.

C/1999 P6 (1999 August 05 01:27 - 06:50 UTC)
MPEC 2002-F43

Drawn are the mean Marsden orbit for 04:09 UTC and the
measured positions (black circles).

The velocities derived from the positions are 67 (01:27-02:26)
and 71 pixel/h (05:50-06:50).

There could be additional images in C2.

C/1999 U2 1999 October 25 was observed in C2
and C3.

C2: from T-0.77 to T-0.39 days

C3: from T-0.01 to T+0.51 days

C/2000 C3 2000 February 04/05 13:31 - 02:30 UTC
in C2

only in C2: T-0.28 to T+0.27 days

Drawn are the mean Marsden orbit for 20:00 UTC and the measured
positions (black circles).

The velocities derived from the positions are 74 (13:31-15:30),
81 (18:12-20:16)

and 74 pixel/h (00:35-02:30).

C/2000 C4 2000 February 05 04:30 - 15:30 UTC in
C2

In C2: T-0.28 to T+0.23 days, in C3: T-0.54 to T-0.33
days.

Drawn are the mean Marsden orbit for 10:00 UTC and the measured
positions (black circles).

The velocities derived from the positions are 76 (04:30-06:30),
80 (08:30-11:30)

and 76 pixel/h (13:30-15:30).