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

The Discovery of the Kracht Group
The Tracks of the Marsden Comets in C2
The Tracks of the Meyer 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.
(Apr, May, Jun; Jul; Aug, Sep: right to left)
(Oct, Nov, Dec, Jan, Feb, Mar: left to right)
The first gray number is at the perihelion of the orbit.
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 14 Kracht group comets (2002 October):

q = 0.0483, peri = 53.5, node = 48.5, incl = 13.6 deg (L = 101.2, B = +10.8).

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

C/1999 M3 0.54 days (from T-0.30 to +0.24 days in C2)
C/1999 N6 0.54 days (from T-0.18 to +0.36 days in C2)
C/2000 O3 1.28 days (from T-0.72 to -0.22 in C3 and from T-0.04 to +0.56 days in C2)
C/2001 Q7 0.14 days (from T+0.05 to +0.19 days in C2)
C/2001 Q8 0.17 days (from T+0.06 to +0.22 days in C2)
C/2001 R8 0.18 days (from T+0.14 to +0.33 days in C2)
C/2001 R9 0.08 days (from T+0.18 to +0.26 days in C2)
C/2002 N2 0.58 days (from T-0.27 to +0.31 days in C2)
C/2002 Q8 0.27 days (from T+0.10 to +0.36 days in C2)
C/2002 Q10 0.17 days (from T+0.10 to +0.27 days in C2)
C/2002 S4 1.23 days (from T-0.61 to +0.18 in C3 and from T+0.32 to +0.62 days in C2)
C/2002 S5 0.19 days (from T+0.32 to +0.51 days in C2)
C/2002 S7 0.78 days (from T-0.34 to +0.20 in C3 and from T+0.38 to +0.44 days in C2)
C/2002 S11 1.24 days (from T-0.27 to +0.52 in C3 and from T+0.49 to +0.97 days in C2)


New Kracht group comets since 2002 October:
C/1996 X3 0.51 days (from T-0.54 to -0.03 days in C2)
C/1996 X4 1.24 days (from T-0.47 to +0.05 days in C2 and from T+0.11 to +0.78 days in C3)
C/1996 X5 1.15 days (from T-0.42 to -0.00 days in C2 and from T+0.06 to +0.73 days in C3)
C/2004 A3 0.08 days (from T-0.16 to -0.08 days in C2)
C/2004 B3 0.53 days (from T-0.11 to +0.42 days in C2)
C/2004 J4 0.13 days (from T-0.21 to -0.09 days in C2)
C/2004 J12 0.13 days (from T-0.17 to -0.04 days in C2)
C/2004 J13 0.14 days (from T-0.17 to -0.02 days in C2)
C/2004 J15 0.11 days (from T-0.15 to -0.04 days in C2)
C/2004 J16 0.11 days (from T-0.05 to +0.06 days in C2)
C/2004 J17 0.10 days (from T-0.12 to -0.02 days in C2)
C/2004 J18 0.08 days (from T-0.13 to -0.05 days in C2)
C/2004 J20 0.15 days (from T-0.15 to -0.00 days in C2)
C/2004 L10 0.54 days (from T-0.43 to +0.11 days in C2)
C/2005 W4 0.80 days (from T-0.15 to -0.09 in C2 and from T-0.02 to +0.65 days in C3)
C/2008 E4 0.18 days (from T+0.24 to +0.43 in C2)
C/2008 G6 0.17 days (from T-0.62 to -0.45 in C2) faint C3 images not measured
C/2008 N4 0.15 days (from T-0.28 to -0.13 in C2)
C/2008 R7 1.14 days (from T+0.19 to +0.99 in C2, -0.15 to +0.22 in C3, -0.07 to +0.37 in COR2A)
C/2009 L8 0.56 days (from T-0.45 to +0.11 days in C2)
C/2009 L13 0.13 days (from T+0.02 to +0.15 days in C2)
C/2009 Y10 0.12 days (from T+0.01 to +0.13 days in C2)

Mean elements of the first 36 Kracht group comets:

q = 0.0481, peri = 55.4, node = 46.9, incl = 13.5 deg (L = 101.6, B = +10.9).

All observations are close to the time of perihelion (T).
In C3 the times are from T-0.72 to T+0.78 and in C2 the times are from T-0.62 to T+0.99 days.
The following C2 tracks run from T-0.75 to T+0.75 days.

Tracks of the known Kracht comets (2002 Jul 22):

C/1999 M3 (1999 June 30 09:30 - 22:30 UTC) MPEC 2002-E18
Drawn are the mean Kracht orbit for 16:00 UTC and the measured positions (black circles).
The apparent track runs through the upper left corners of the drawn numbers.

The velocities derived from the positions are 72 (09:30 - 11:30) and 72 pixel/h (20:30 - 22:30).
The comet moves right to left (west to east).

C/1999 N6 (1999 July 12 02:55 - 15:54 UTC) MPEC 2002-F03
Drawn are the mean Kracht orbit for 09:00 UTC and the measured positions (black circles).

The velocities derived from the positions are 72 (02:55 - 04:55) and 72 pixel/h (13:54 - 15:54).
The comet moves right to left (west to east).

C/2000 O3 (1999 July 30-31 21:30 - 12:06 UTC) MPEC 2000-Q09
Drawn are the mean Kracht orbit for 05:00 UTC and the measured positions (black circles).

The velocities derived from the positions are 64 (21:30 - 23:32) and 62 pixel/h (10:06 - 12:06).
The comet moves right to left (west to east).
The comet was visible in C3 July 30 05:30 - 15:18.

C/2001 Q7 (2001 August 21 20:27 - 23:50 UTC) MPEC 2001-R36, 2002-F43
Drawn are the mean Kracht orbit for 22:09 UTC and the measured positions (black circles).

The velocities derived from the positions are 60 (20:27 - 22:27) and 63 pixel/h (21:50 - 23:50).
The comet moves right to left (west to east).

C/2001 Q8 (2001 August 24 20:50 - 25 00:50 UTC) MPEC 2002-O35
Drawn are the mean Kracht orbit for 22:50 UTC and the measured positions (black circles).

The velocities derived from the positions are 58 (20:50 - 21:50) and 62 pixel/h (23:50 - 00:50).
The comet moves right to left (west to east).

C/2001 R8 (2001 September 06 19:32 - 23:54 UTC) MPEC 2002-O35
Drawn are the mean Kracht orbit for 21:43 UTC and the measured positions (black circles).

The velocities derived from the positions are 52 (19:32 - 20:31) and 56 pixel/h (23:06 - 23:54).
The comet moves right to left (west to east).

C/2001 R9 (2001 September 07 12:06 - 13:55 UTC) MPEC 2002-O35
Drawn are the mean Kracht orbit for 13:00 UTC and the measured positions (black circles).

The velocities derived from the positions are 49 (12:06 - 12:54) and 51 pixel/h (12:54 - 13:55).
The comet moves right to left (west to east).



Other low inclination comets:

C/1999 R1 (1999 September 04 21:30 - 05 02:06 UTC) MPEC 1999-R19
Drawn are the mean Kracht orbit for 23:48 UTC and the measured positions (black circles).

The velocities derived from the positions are 54 (21:30 - 22:30) and 48 pixel/h (00:54 - 02:06).
The comet moves left to right (east to west).
The track doesn't fit, but looks similar to the October tracks.
With the mean Kracht orbit for 1999 Oct 20 23:48 UTC there is a good fit:

C/1999 R1 could be related to the Kracht group.

C/1999 R1 has returned as P/2003 R5 and 2007 R5 (orbital period 4.0 years).
It belongs to a small group ("Kracht2").

C/2001 D1 (2001 February 18 09:45 - 12:35 UTC) MPEC 2002-O27
Drawn are the mean Kracht orbit for 11:10 UTC and the measured positions (black circles).

The velocities derived from the positions are 67 (09:45 - 10:45) and 70 pixel/h (11:35 - 12:35).
The comet moves right to left (west to east).
The mean Kracht track runs from left to right, C/2001 D1 seems not to be related with the Kracht group.

C/2001 D1 and the mean Kracht orbit for 2001 July 28 11:10 UTC:

There is only a weak relationship and this is certainly not a member of the Kracht group.

C/2001 D1 has returned as 2004 X7 and 2008 S2 (orbital period 3.8 years). MPEC 2008-S82