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Seven Sisters of the Pole (1 of 18,816)


oc gc pln bn dn gx gxcl ast aka lost

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Imaged by Anthony Ayiomamitis

Subject: G116.9+00.2 (CTB 1)

Equipment: 4-inch Tak FSQ 106/f5 astrograph, SBIG ST-10XME, Baader narrowband CCD imaging filters and SBIG/Custom Scientific LRGB filters.

Date: 2010 September

Field of view: 96 x 65 arcminutes

Comments: "Six evenings in early September were dedicated to CTB 1 with two complete evenings for H-a, one complete evening for each of S-II and O-III and one further evening for the LRGB portion so as to get the background sky and proper star colours for G2V calibration (the sixth evening was dedicated to reshooting replacement exposures due to planes/satellites). More specifically, the narrowband portion involved 50x30-min exposures at -17.5d C whereas the LRGB portion was based on 40x03min and 30x6-min exposures (also at -17.5d C), thus representing 30 hrs of total data. These totals do not include eight 30-min subs which were lost due to planes or satellites and which can be attributed to the length of the 30-min exposures. Also, I had fairly significant light gradients, especially for the narrowband images thanks to the lengthy duration of the individual integrations and which were acute (the O-III was the worst of the bunch)."


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