Here, where I got informations related to Comets, great place
C/2001A2 (Linear)
Image recorded by C.CAVADORE, 07/23/2001 - 01h17m23s, 1400sec cumulated exposure, from 120sec single unguided exposures, T250 F/D=3.5, CCD TH7899M, note : the comet's tail is almost a degree, 1 pixel is 3.05 arcsec.
C/1999 T1 (McNaught-Hartley)
Image recorded by C.CAVADORE and B.GAILLARD, 05/20/2001 - 01h25m42s, 1200sec cumulated exposure, 100sec unguided, T250 F/D=3.5, CCD TH7899M, note : the comet's tail is 16 arcmin, 1 pixel is 3.05 arcsec. The following tables shows limiting magnitude reached from my "Garden Observatory" : Mg 20 at SNR=3, not so bad for 20 min exposures !
C/1999 T2 (Linear)
Image recorded by C.CAVADORE and B.GAILLARD, 05/20/2001 - 00h37m46s, 1700sec cumulated exposure, from 120sec unguided single exposures, T250 F/D=3.5, CCD TH7899M, 1 pixel is 3.05 arcsec.
LINEAR 1999S4
Next image from Raymond Poncy, Cres, 34000, France.
Image acquired the 07/22/2000 - 22h29m19s UTC, Air mass=3, Elevation=19.3°, at RA=09h38m36.050s, DEC=57°01'15.52'' T250 Telescope, focal length : 944mm, 60 sec exposure, CCD TH7899M 2x2 Binned (1 pixel=6.2 arcsec), Comet at 0.37au from earth. By C.Cavadore and Boris Gaillard. This image was acquired whilst the comet was at 5° apart from a street light, almost thru a tree which explains the strange feature in the image background. This single image was processec as best as we can and It was really a challenge to flat field it out !!....Also Moon was visible and 79% illuminated, at 121° from the comet.
The maps are according to PRiSM. Above, the Sun is downward.
