Observation
Comet 17P/Holmes in 2007
Written by Toshimi Taki
November 4, 2007
Revised November 24, 2007
Observation of Comet 17P/Holmes
17P/Holmes made outburst on October 24, 2007 from 17 magnitude to 3 magnitude. I observed the comet on October 27 in the full-moon sky. I could locate the comet in the center of Perseus with naked eyes. I made a sketch with my 8-inch reflector. I estimated the brightness as 2.7 magnitude and the diameter was 4'.
I continued the observation till November 18. Summary of the sketches and growth of the actual diameter of the coma are shown below.
See summary of my observation
See summary of my observation (in Japanese)
Summary of Sketches
Actual Size of Coma
Movement
Sketches
Date: October 27, 2007, 23:15 JST
Location: Konan City, Aichi Prefecture, Japan
Notes
- Instrument: 8inch F6 reflector with SP9.7mm Eyepiece
- Position: 3h50.6m, +50deg 19' (from the sketch)
- Easy to see with naked eyes in full-moon sky.
- Brighter than Delta Per (3.0 mag.), same brightness as Delta Cas (2.7 mag.)
- Yellowish in 7x50 binoculars.
Date: October 28, 2007, 22:00 JST
Location: Konan City, Aichi Prefecture, Japan
Notes
- Instrument: 8inch F6 reflector with WF15mm and SP9.7mm Eyepieces
- Position: 3h49.8m, +50deg 22' (from the sketch)
- Brighter than Delta Per (3.0 mag.), same brightness as Gamma Per (2.9 mag.)
- Yellowish
Date: November 2, 2007, 21:20 JST
Location: Konan City, Aichi Prefecture, Japan
Notes
- Instrument: 8inch F6 reflector with WF15mm and SP9.7mm Eyepieces
- Position: 3h44.5m, +50deg 35' (from the sketch)
- Same brightness as Delta Per (3.0 mag.)
- Yellowish
Date: November 3, 2007, 21:15 JST
Location: Konan City, Aichi Prefecture, Japan
Notes
- Instrument: 8inch F6 reflector with WF15mm and K27mm Eyepieces
- Position: 3h43.4m, +50deg 36' (from the sketch)
- Fainter than Delta Per (3.0 mag.) --> 3.2 mg
Date: November 7, 2007, 21:00 JST
Location: Konan City, Aichi Prefecture, Japan
Notes
- Instrument: 8inch F6 reflector with WF15mm and K27mm Eyepieces
- Position: 3h39.0m, +50deg 36' (from the sketch)
- Fainter than Delta Per (3.0 mag.) --> 3.4 mg
Date: November 11, 2007, 22:40 JST
Location: Konan City, Aichi Prefecture, Japan
Notes
- Instrument: 8inch F6 reflector with K27mm Eyepiece
- Position: 3h33.6m, +50deg 32' (from the sketch)
Date: November 14, 2007, 22:15 JST
Location: Konan City, Aichi Prefecture, Japan
Notes
- Instrument: 8inch F6 reflector with Konig32mm, K27mm and WF15mm Eyepieces
- Position: 3h30.0m, +50deg 24' (from the sketch)
Date: November 16, 2007, 22:35 JST
Location: Konan City, Aichi Prefecture, Japan
Notes
- Instrument: 8inch F6 reflector with Konig32mm and WF15mm Eyepieces
- Position: 3h27.7m, +50deg 23' (from the sketch)
Date: November 18, 2007, 21:55 JST
Location: Konan City, Aichi Prefecture, Japan
Notes
- Instrument: 8inch F6 reflector with Konig32mm Eyepiece
- Position: 3h25.0m, +50deg 13' (from the sketch)
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