28.-31.10. and 1.12.2007: Comet 17P/Holmes from POR and LAC
Comet 17P/Holmes from POR, 28 October 2007 at 20:29 UTC.
Apochromat 200/1600, modified Canon EOS 5D, 8x 8s at ISO 800 & 8x 4s at ISO 400, FOV 25'.
Visual impressions (123x200, Ethos; 133x200, Binoviewer+Nagler; 215x280, Ethos):
- pseudo-nucleus and off-axis bright zone pinkish yellow, greatly subdued using Swan Band filter;
- coma generally grey with some brown or purple hues, total diameter of shell 6' with green-blue edges.
Naked-eye observation: 2.8 mag, almost stellar, white-yellow.
Comet 17P/Holmes from POR, 29 October 2007 at 20:47 UTC.
Celestron 11, modified Canon EOS 5D, 8x 8s at ISO 1600 & 8x 8s at ISO 800, FOV 35'.
Note extended blue outer coma, more visible than the day before.
Visual impressions (215x280, Ethos):
- coma generally grey with some brown or purple hues, total diameter of bright shell 8' with blue edges.
- naked-eye observation: 2.4 mag, fuzzy, whitish.
Comet 17P/Holmes from LAC, 31 October 2007 at 21:52 UTC.
2300/5.2 'Albert' telescope, Canon EOS 1Ds II, 6x 4s at ISO 1600 & 6x 8s at ISO 3200 & 6x 30s at ISO 3200, FOV 38'.
Comet 17P/Holmes from LAC, 01 December 2007 at 18:10 UTC.
520/2.7 'Bernard' astrograph, Canon EOS 1Ds II, 6x 30s at ISO 1600 & 6x 60s at ISO 800, FOV 3° (North is left). >
Insert: Comet 8P/Tuttle at 18:25 UTC, same day, same set-up, same scale.