Exposure Data

• Instrument: 4.1" f/6.2 APO
• F/stop: 6.2
• Exposure: 10 + 2 minutes
• Camera: Modified Nikon D70 Digital SLR
• Sensitivity: ISO 1600
• Exposure start: 23:56 MEZ
• Date: December 12, 2004
• Location: Ebenwaldhöhe, Lower Austria
• Conditions: Visual limiting magnitude 6.0 mag, seeing 3, temperature -5.5°C, no wind, low humidity
• Autoguider: Meade Pictor 216 XT, max. error: 4
• Enhancement: Adobe Photoshop CS 8.0, SGBNR 1.0.4
• Notes: The 2-minute exposure was used to substitute the saturated comet's core of the long shot. Autoguiding on the comet's core worked, but was not perfect, corrections were large. Field size 53 x 62 arcmin; north is up, east to the left.