• We started observing at6pm
• We went Procyon and aligned the telescope using it.
• We looked at the Beehive cluster but there were not enough stars.
• We chose M39 cluster.
• Taaking images in no, red, blue, green, luminance filters.
• No filter: 60 sec exposure
• Red filter: bad target
• new targetr: ra: 2h43min07sec, dec:+47deg47arcmin01arcse3c
• nf 30s rf 120s bf 120s
• same cluster, new location: ra:2hr43min15sedc, dec:42deg49arcmin00arcsec
• nf 30s, bf 120s, rt 60s. Blue ewass terrible.
• new loc: ra: 2hr43min11sec, dec:42deg51arcmin30arcs
• nf: 30s, bf:90s, rf: 90s.
• new loc: ra 2hr43min21sec, dec 42deg56arcm50arcs
• nf 90s, bf failed. The stars were too dim.
• Finished at 21.31

• 15:50 began taking master bias, dark and flat frames.
• Joined by Claire at 17:00

Log Book Entry No.87

Created: 03 Feb 2016 16:24:50

Last Revised: 03 Feb 2016 21:36:43

DavidHadden

20160203 Observation

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Started data taking at 13:20.

cooler set to -15 degrees, ambient temperature 8 degrees

Sequence of:

• bias, (dark) 0.1 10, 30, 60, 90, 120
• Repeated every 30 minutes.
• Took a large piece of card and evenly illuminated it in order to take flat frames. In order to investigate the cooling ring/dust. Note that if the focus is changed this will have to be repeated.
• Had to place cover on telescope for dark frames, as an illuminative effect was seen.
• Ring appeared to be gone as of 15:10, took 01:50 taken to disappear.
• Bright border remains after above time.
• at 15:20 started taking 1 second dark and flat frames.
• 15:50 began taking master bias, dark and flat frames.l