Comet C/1999 S4 (LINEAR)

Comet C/1999 S4 (LINEAR) on July 21, 2000

This image of comet C/1999 S4 (LINEAR) was taken on July 21 from my backyard in urban Scottsdale as the comet neared perihelion. At this point, the comet had become an evening object. Unfortunately, the comet did not become as bright as many had hoped, and never did achieve naked eye visibility. The comet was moving quickly, and changed positions during each successive exposure. As a result, the background stars changed position in each exposure as the comet moved. This comet was discovered by the Lincoln Laboratory Near Earth Asteroid Research (LINEAR) project.

This is a composite CCD image of ten 30 second exposures taken with an ST-8E using a 5 inch Takahashi FS-128 refractor telescope at f8.

Constellation: Ursa Major
RA: 09h 48m 54.6s Dec: +55d 32' 00"
July 21, 2000 at 0410 U.T.
Image by Sid Leach
Scottsdale, Arizona

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