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(IAAC) Abell 22 (PK 215+11.1; PN G215.6+11.1) - 17.5" F/4.5



Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Date and UT of observation: 30 December 1994, about ??h?? UT
Location & latitude: La Clapiere Obs. (France, latN44 40 00, longE06 27 36)
Site classification: rural, alt.1650m (5500ft)
Limiting magnitude (visual in UMi): 5.6 with averted vision
Transparency (1 to 5 - best to worst): 2
Seeing (1 to 5 - best to worst): 4
Moon up (phase?): no
Instrument: Coulter 17.5" (445mm) F/4.5
Magnification: 145x
Filters used: UHC, OIII
Object: Abell 22 (PK 215+11.1; PN G215.6+11.1, K1-11)
Category: planetary nebula
Constellation: CMi
Object data: Bmag=15.4; dim.87"x87"; type III PN; central star of
Vmag=19.1; discovered by Abell in 1955.
RA/DE: 07h36.1m, +0242' (2000); Uranometria 229

Description: at 145x, medium sized PN, extremely faint, round with fuzzy
borders; estimated diameter based on drawing of about 66"; homogeneous,
only visible between 87 and 145x with OIII; OIII filter has a good contrast
gain and UHC has little; a mag13 star is on the nebula between the center
and the E border; a mag9 star is 4.6'NE.

I can provide a scanned drawing of Abell 22 to anyone who can read the
binhex encoding of Eudora (for Mac); just mail me to try
(ypothier@abi.snv.jussieu.fr), it works sometimes with other
configurations...


Yann Pothier
11 impasse Canart, 75012 PARIS, FRANCE
ypothier@abi.snv.jussieu.fr
ypothier@closun.snv.jussieu.fr
http://www.astrosurf.org/cielextreme
http://www.astrosurf.com/cielextreme
http://astrosurf.org/skylink/publi/cielextreme,


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