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2010 Jan 18 21:49 UTC

Source file:
2000comets.txt

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41P/Tuttle-Giacobini-Kresak

Giovanni Sostero (Remanzacco Observatory) took this image on 2000 December 24 at 0507 using a 0.3m f/2.8 Baker-Schmidt camera and a Hi-Sys 24 CCD. The image scale is 2.4 arcsec/pixel and this is a composite of 15, 60 sec exposures. Gabriel Oksa made this drawing on 2000 December 20.

C/1999 S4 (LINEAR)

This comet was discovered last year by the LINEAR search. The 3-D orbit shows that the comet was well north of the ecliptic in 2000 June and July. Throughout these months it was visible as a morning and then a circumpolar object from the northern hemisphere. In mid-July it moved into the evening sky.

By early July the coma and tail were showing up well in CCD images. Towards the end of July, as the comet passed through perihelion, CCD images were showing multiple ion tails overlaying the dust tail. At about this time the comet broke up and its magnitude dropped dramatically below the predicted value.

June images
2000 June 15.07. Luigi Sannino. 6 x 60 sec exposure, 0.4m R-C + ST-6.
2000 June 22.05. Martin Mobberley. 60s exposure, 0.49m Newt. + SX.
2000 June 26.00 Denis Buczynski, 60 sec, 0.33m, f/3 + SXL8.
2000 June 27.03. Denis Buczynski, 60 sec, 0.33m, f/3 + SXL8.
2000 June 29.99. Luigi Sannino. 9 x 60 sec exposure, 0.4m R-C + ST-6.
July images
2000 July 1.06. G.Bonatti, P.Pietrapiana, L.Sannino. 9x60 sec, 0.4m R-C + ST-6.
2000 July 2.05. Nick James. 20x30sec, 0.30m, f/5.2 Newt.
2000 July 4.00. Denis Buczynski, 14x60 sec, 0.33m, f/3 + SXL8.
2000 July 4.05. Giovanni Sostero, 15x60 sec, 0.31m, f/2.8 Baker-Schmidt.
2000 July 7.04. Giovanni Sostero, 40x60 sec, 0.31m, f/2.8 Baker-Schmidt.
2000 July 11.03. Denis Buczynski, 120 sec, 0.33m, f/3 + SXL8.
2000 July 15.01. Denis Buczynski, 10x30 sec, 0.33m, f/3 + SXL8.
2000 July 15.99. Denis Buczynski, 10x30 sec, 0.33m, f/3 + SXL8.
2000 July 17.03. Denis Buczynski, 15x30 sec, 0.33m, f/3 + SXL8.
2000 July 17.10. M & P.Pietrapiana, L.Sannino. 3x180 sec, 0.4m R-C + ST-6.
2000 July 17.95. Martin Mobberley. 60s exposure, 0.49m Newt. + SX.
2000 July 18.06. Nick James. 20x30sec, 0.30m, f/5.2 Newt. Also in false colour.
2000 July 19.93. Nick James. 20x30sec, 0.30m, f/5.2 Newt. Also in false colour.
2000 July 19.96. Denis Buczynski, 20x30 sec, 0.33m, f/3 + SXL8.
2000 July 20.92. Nick James. 19x30sec, 0.30m, f/5.2 Newt. Also in false colour.
2000 July 21.04. A. Bondielli & P.Pietrapiana. 180 sec, 0.4m, f/8 R-C + ST-6.
2000 July 21.92. David Strange. 10x20sec, 0.50m, f/4. Also in false colour.
2000 July 23.96. Denis Buczynski, 10x30 sec, 0.33m, f/3 + SXL8.
2000 July 25.8. Gabriel Oksa et.al., 2x60s, 0.2m, f/4.5 Newt + SX CCD.
Drawings by Gabriel Oksa
2000 June 27.
2000 July 5.
2000 July 24.
2000 July 25.

C/1999 T2 (LINEAR)

This comet was imaged by Denis Buczynski. To show the motion he obtained two images, one at 2000 May 31.042 and one at 2000 May 31.053.

C/1999 Y1 (LINEAR)

This comet is now an easy target for CCD observers. Nick James obtained these images on 2000 September 24 and 2000 September 30. Both images show a faint anti-tail as does this image taken on 2000 October 4 by Heinz Kerner. He comments: "On Oct 2nd the earth crossed the orbital plan of the comet. A rough estimate with a revolving planisphere shows, that anything to the NE is in the direction to the sun. The image attached, taken on Oct 4th (3x5min. with a 0.15-m f/5 refl. + MX5 CCD) confirms this." Another image by Kerner obtained on 2000 October 22.94 clearly shows this feature. A further image obtained on 2000 December 3.76 was obtained under poor conditions.
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