C/2009 F4 (McNaught), C/2009 F5 (McNaught), C/2009 F6 (Yi-SWAN), and C/2006
W3 (Christensen)
C/2009 F6 (Yi-SWAN) was observed visually by the 15cm refractor
at 22x. It was very faint and its total magnitude was estimated to be at
11.5 with the coma 1.5' in diameter. The photograph below was taken with
the 70cm reflector, but the comet's low altitude and poor seeing made it
difficult to focus. The GSC catalog does not provide adequate data around
the position of the comet. In the ACRS catalog several comparison stars
are found some distance away from the comet. Because of this, the results
below may contain some inaccuracy. The comet can be observed visually by
a 20cm telescope or larger.
Nearby C/2006 W3 was also visually observable.
C/2009 F6 (Yi-SWAN)
10-minute exposure from 4:30 J.S.T. on April 7, 2009
70cm f/7 reflector, TMY 400 film
C/2006 W3 (Christensen)
7-minute exposure from 4:10 J.S.T. on April 3, 2009
70cm f/7 reflector, TMY 400 film
CK09F050 2009 04 02.72014 14 57 46.70 -31 44 23.3 17.5 N 372
CK09F050 2009 04 02.73576 14 57 45.42 -31 43 58.7 372
CK09F050 2009 04 06.76389 14 51 52.50 -29 58 48.3 17.5 N 372
CK09F040 2009 04 06.75556 15 41 26.20 -23 48 11.6 18.0 N 372
CK09F060 2009 04 06.80416 23 59 04.98 +54 54 32.3 12.5 N 372