(IAAC) Obj: IRAS09371+1212 (Frosty Leo, GSC0824-1094) - Inst: 17.5" f/4.5 dob
Observer: Steve Gottlieb
Your skills: Advanced (many years)
Date and UT of Observation: 16 Mar 1996, 13 Apr 1996
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, 288x, 410x
Filters used: None
Object: IRAS 09371+1212 (Frosty Leo, GSC 0824-1094)
Category: Planetary nebula.
Class: Protoplanetary? Central star class M4
Data: Mag 11?; size 15"x10"
Position: 093954 +115853
17.5" (4/13/96): At 100x, appears as a slightly "soft" mag 11 star, but
not noticeably nonstellar. Forms a "double" with a mag 12.5 star less
than 1' NE. Best view at 410x and is clearly elongated WNW-ESE,
perhaps 12"x8". Brighter center but no central star visible.
17.5" (3/16/96): This unusual reflection nebula is dubbed the "Frosty
Leo" nebula and first visual observations posted on sci.astro newsgroup
in March 1995. At 100x, appears as an "out of focus" mag 11 star. A
fainter mag 12.5 star lies 54" NE. At 220x, clearly nonstellar, ~10"
diameter and surprisingly high surface brightness. At 288x and 410x
appears slightly elongated NW-SE, 15"x10" and slightly flattened on the
See succeeding logs, for several more proto-planetary observations.
Cross-posted with Steve's permission, from the extraordinary Yahoo!
forum called "Planetary_Nebulae", moderated by Mr. Eric Honeycutt:
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