9-19-10 3:45-4:15 UT (11:45-12:15 EDT)
Sys I 186.23, Sys II 181.45, Sys III 181.45
Seeing 4/5 (II Antoniadi's Scale), Transparency 3/5
10" f/4.8 Newt Dob
Burgess Binoviewer w/1.9x OCA
Orion ED-2 22mm pair: 104x, 0.5 deg TFOV, 2.4mm exit pupil
Apodizing mask, Baader Moon & Sky Glow filter
Baffled fan suspended below primary (constant air flow)
Maintained photopic adaptation by intermittent exposure to bright white light
GRS toward p limb. Some detail visible in GRS, with rim darker than interior. Oval BA (GRS Jr) immediately S p GRS. Indication of possible thin STrB p GRS. STB dark and distinct, darker and thicker f GRS. RSH thick and pretty white. Three extended light ovals in STZ f Oval BA. SSTB and S3TB apparent, but tending to blend into SPR, which was somewhat darker than NPR. SEBn dark, thin and obvious, especially immediately N of RSH. SEBs seen as lighter and thinner than SEBn.
EB easily seen in EZ. Dark knot in EB at CM. Fine, light-blue-gray garlands and festoons between NEB and EB. Large garland between NEBs edge and EB between CM and f limb. Similar garland (or festoon?) but less distinct between CM and p limb.
Mottling and dark concentrations in NEB. Extended dark concentration immediately f CM in NEB. Obvious, sharply bordered, arched rift S of concentration. (I have seen this same concentration and rift consistently when well-placed during the last few weeks. It looks like an eye in the NEB. The NEB Eye?) Notch f this concentration on NEBn edge. Another more obvious notch on NEBn edge midway between CM and p limb. Another arched rift, much less distinct than first, S f this notch. Several NEBn barges visible. A large extended white oval toward p limb, a second at f limb. NTB and NNTB dark, both containing numerous bars. Much fainter band between them in NTZ. N3TB appears to be discontinuous and much less distinct than NTB and NNTB. NPR somewhat lighter toward S at p limb.