(IAAC) J 900 (PK 194+02.1; PN G194.2+02.5) - 8" F/10

Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Date and UT of observation: 29 December 1991, about 22h30 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 indirect vision
Transparency (1 to 5 - best to worst): 1
Seeing (1 to 5 - best to worst): 3
Moon up (phase?): no
Instrument: Meade 8" F/10
Magnification: 145x
=46ilters used: visual spectroscope
Object: J 900 (PK 194+02.1; PN G194.2+02.5; Jonckheere 900; ARO 92)
Category: planetary nebula
Constellation: GEM
Object data: Vmag=3D11.7; dim.12"x10"; type IIIb+II; central star of
Vmag=3D16.26; discovered by Jonckeere in 1916; ELCAT: [OIII, 496+510nm] =3D =
x [Hbeta, 486nm].
RA/DE: 06h25.9m, +17=B047' (2000); Uranometria 137
Description: found easily at 80x with spectroscope as a "star" of mag10-11;
at 145x, small fuzzy star with a fainter companion that can give an
elongated appearance when the seeing is bad; stellar nucleus; at 312x, the
companion is more apparent at about mag13 and maybe only about 5" to the S.
I can provide a scanned drawing of J 900 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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