(IAAC) Abell 79 (PK 102-02.1; PK 102-2 1; PN G102.9-02.3) - 17.5" F/4.5

Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Date and UT of observation: 14 August 1997, about 02h50 UT
Location & latitude: La Clapiere Obs. (France, latN44 40 00, longE06 27 36)
Site classification: rural, alt.1650m (5500ft)
Limiting magnitude (visual in UMi): 6.4 with indirect vision in UMi 30% of
the time
Transparency (1 to 5 - best to worst): 1
Seeing (1 to 5 - best to worst): 2 (stellar stars until 211x)
Moon up (phase?): no
Instrument: Coulter 17.5" (445mm) F/4.5
Magnification: 400x
=46ilters used: OIII, UHC, Hbeta
Object: Abell 79 (PK 102-02.1; PK 102-2 1; PN G102.9-02.3)
Category: planetary nebula
Constellation: LAC
Object data: Vmag=3D15.0; Bmag=3D15.8; dim>59" ; central star of V=3D17.6;
discovered by Abell in 1955
RA/DE: 22h26.3m, +54=B049' (2000); Uranometria 57;
Description: at 250x and OIII, medium sized PN, extremely faint with filter
and invisible without; seen from 74x to 250x with OIII; round and quite
homogeneous but the NE zone is very slightly fainter leaving the rest as a
kind of crescent; estimated diameter about 50"; a couple of stars
mag14+mag15 are on the SW border and another mag15 star is on the NE edge;
UHC has a small contrast gain, OIII has a good one and Hbeta has no effect.
I can provide a scanned drawing of Abell 79 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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