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)

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