(IAAC) K 2-2 (PK 204+04.1; PN G204.1+04.7) - 17.5" F/4.5

Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Date and UT of observation: 07 February 1997, about 21h30 UT
Location & latitude: La Clapiere Obs. (France, latN44 40 00, longE06 27 36)
Site classification: rural, alt.1650m (5500ft)
Limiting magnitude (visual in UMi): 6.31 with averted vision 30% of the time
Transparency (1 to 5 - best to worst): 1
Seeing (1 to 5 - best to worst): 3
Moon up (phase?): no
Instrument: Coulter 17.5" (445mm) F/4.5
Magnification: 74x
=46ilters used: OIII, UHC, Hbeta
Object: K 2-2 (PK 204+04.1; PN G204.1+04.7; PK 204+4 1; ARO 128)
Category: planetary nebula
Constellation: MON
Object data: Vmag=8911.8; dim.414"x414"; type III; central star of Vmag=3D15=
discovered by Kohoutek in 1963; ELCAT: [OIII, 496] =3D 2 x [Hbeta, 486nm].
RA/DE: 06h02.4m, +09=B039' (2000); Uranometria 181
Description: at 74x and OIII, very extended PN, extremely faint, round with
ill defined edges; invisible without filter, quite homgeneous despite a
very slightly brighter zone in the E area; estimated diameter of about 5.3'
(on drawing, ie 318"); it contains 2 stars of mag11 and numerous others of
mag13-14; the brighter zone is about 1.5' in diameter towards the ESE
border (PA120=B0); UHC and Hbeta are not giving better contrast but the OIII
has a good contrast gain.
Note: I have not found it in Gottlieb's or Patchik's listings. Has anyone
else seen it? On the POSS, it looks completely different like a crescent
nebula, a sort of Medusa (Abell 21) bis. BTW Abell 21 will follow shortly...
I can provide a scanned drawing of K 2-2 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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