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(IAAC) Obj: Sanduleak 2-21 - Inst: 40" f/5 dob
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Observer: Mark G.Birkmann
Your skills: Intermediate (some years)
Date/time of observation: 1/14/2000, 8:10 UT, 2:10 CST
Location of site: New Haven, Missouri (Lat ~38, Elev ~700 feet)
Site classification: Rural
Sky darkness: 5 <1-10 Scale (10 best)>
Seeing: 6 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 40" f/5 dob
Magnification: 235, 470
Filter(s): orion ultrablock
Object(s): Sanduleak 2-21
Category: Planetary nebula.
Class:
Constellation: Pupis
Data: mag 13.6 size 40"
Position: RA 8:8m 44s DEC -19:14'
Description:
This planetary is easily found 4' west of the 4th mag. star 16 pupis. At 235x
it was faint, but visible with direct vision. With the Orion Ultrablock filter
the nebula appeared very bright and somewhat larger, even with 16 pupis in the
field of view. The nebula was grey, had a uniform surface brightness, no hint
of structure or of a central star, and had indistinct edges. Interestingly,
Steve Gottlieb noted in the autumn 1998 issue of DeepSky that for some unkown
reason this nebula wasn't identified until 1975. This would be understandable
if it were only visible in very large scopes but he reported it as easily
visible in his 13.1" scope with OIII filter. If this object escaped detection
for so long might there be other? A drawing can be seen at
http://www.fortunecity.com/greenfield/twyford/637/drawings.htm
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Optional related URLs: http://www.fortunecity.com/greenfield/twyford/637/drawings.htm
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