Comet C/1999 S4 (LINEAR) Pages
About Comet C/1999 S4 (LINEAR)
Comet C/1999 S4 LINEAR was discovered with the Lincoln Near Earth Asteroid Research (LINEAR) telescope operating in New Mexico, USA. It passed perihelion (closest approach to the Sun) on July 26, 2000 at a distance of 0.76 AU (about 115 million km). The comet was closest to Earth almost at the same time (July 23) at a distance of 0.37 AU (about 56 million km). Comet C/1999 S4 became a binocular object in late June and brightened to about 6th magnitude until late July, though it never reached naked eye visibility. Images and CCD V-filter photometry, obtained at Crni Vrh Observatory show daily changes in comet activity. According to July 23-27 observations by M. Kidger (Instituto de Astrofisica de Canarias), the comet nucleus disrupted completely after July 23, resulting in further fade of comet brightness. Similar disruption (or possibly turn-off in nucleus activity) was observed at comet C/1996 Q1 (Tabur) in late October 1996.

Since we followed the comet motion on most of our images, the stars appears as rows of dots or short trails. False-colors have been added in order to bring out the comet details as much as possible. In order to cover the comet apparition as good as possible, some high quality images from Italian observers Rolando Ligustri and Giannantonio Milani have been added.

Some additional information regarding the C/1999 S4 disruption
Hubble Discovers Missing Pieces of Comet Linear
The VLT Observes Comet LINEAR's "Shower"
C/1999 S4 (LINEAR) at Gary W. Kronk's Comets & Meteor Showers
See also Astronomy Picture of the Day (2000 July 27)
Comet C/1999 S4 (LINEAR) Images
July 2000, 21-31
July 2000, 1-20
June 2000
December 1999 and January 2000
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