(IAAC) Abell 20 (PK 214+07.1; PK 214+7.1) - 17.5" F/4.5

Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Date and UT of observation: 27 December 1994, about 01h00 UT
Location & latitude: La Clapiere Obs. (France, latN44 40 00, longE06 27 36)
Site classification: rural, alt.1650m (5500ft)
Limiting magnitude (visual in UMi): 6.0 with averted vision 30% of the time
Transparency (1 to 5 - best to worst): 1
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 20 (PK 214+07.1; PK 214+7.1; PN G214.9+07.8; ARO 132)
Category: planetary nebula
Constellation: CMi
Object data: Vmag=14.3; Bmag=16.3; dim.64"x64"; type IIc PN; central star
of Vmag=15.7; discovered by Abell in 1955; ELCAT: [OIII, 495+501nm] = 8 x
[Hbeta, 486nm].
RA/DE: 07h23.0m, +0146' (2000); Uranometria 229
Description: at 145x, medium sized PN, extremely faint, only seen with
filter, round and homogeneous, with fuzzy edges; estimated diameter (on
drawing) of about 52"; a mag 14.5 star on the nebula is somewhat decentered
towards the E and another of mag14 is against the NE border; a mag11 star
is 2.9'W.
I can provide a scanned drawing of Abell 20 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
Yann Pothier
11 impasse Canart, 75012 PARIS, FRANCE
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