(IAAC) Obj: HM Sge (PK53-3.2) - Inst: 17.5" f/4.5 dob
Observer: Steve Gottlieb
Your skills: Advanced (many years)
Date and UT of Observation: 2 Sep 1989
Location: Sierra foothills, CA USA (Elev 900m)
Site classification: Rural
Limiting magnitude: 6.4 to 6.8
Seeing: Fair to very good
Moon presence: None - moon not in sky
Instrument: 17.5" f/4.5 dob
Magnification: 100x?, 220x, 380x
Filters used: None. UHC? OIII.
Object: HM Sge (PK53-3.2)
Category: Planetary nebula. Emission nebula.
Class: (Symbiotic nova)
Data: Mag 10.5? 10.9vm*; size "stellar"
Position: 19:41:57.1 +16:44:41
[Editor's Note: This fascinating stellar object will be found just 45
minutes SSW of the end of the "feathers" of the Arrow. And in fact the
two stars Alpha & Beta Sge roughly point to the area of this object...
NOTE: Do not confuse this symbiotic star with the larger PN Abell 63,
aka PK 53-3.1, 40" wide and a convenient 20 minute hop N of HM Sge.]
17.5" (9/2/89): At 220x appears as a bright, stellar object, estimate
V=10.5. Appears as a large magnitude-contrast double star, with a mag
14 companion just 15" S. Located in a rich star field with two mag 11
stars 1.7' N and 3.2' ENE. These stars are slightly fainter using the
OIII filter but this object has a good contrast gain with the filter.
Listed as a possible proto-planetary in 1976 although recent analysis
shows it to be a mag 11 symbiotic star sytem.
[Reposted with the observers's permission from "Planetary_Nebulae"...]
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