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(IAAC) Abell 39 (PK 47+42 1; PN G047.0+42.4)
Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Date and UT of observation: 04 August 1997, about 22h00 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
Seeing (1 to 5 - best to worst): 2.5 (based on naked eye scintillation;
stellar stars until 160x)
Moon up (phase?): no
Instrument: Coulter 17.5" F/4.5
Magnification: 211x
=46ilters used: UHC, OIII, Hbeta
Object: Abell 39 (PK 47+42 1; PN G047.0+42.4)
Category: Planetary Nebula
Constellation: HER
Object data: Vmag=3D13.0; dim.170"x170"; type IIc; central * of Vmag=3D15.3
(=3DNSV 7743); discovered by Abell in 1955; ELCAT: [OIII]=3D3x[Hbeta]
RA/DE: 16h27.5m, +27=B054' (2000); Uranometria 114
Description: at 211x and OIII, large PN, round, extremely faint without
filter and faint with it; estimated diameter of 216"; edges quite sharp and
the nebula is subtly annular thanks to a center very gradually slightly
fainter (using averted vision); central star of mag16; star of mag14
against the W border.
I can provide a scanned drawing of Abell 39 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 tel: 01 43 41 43 29
11 impasse Canart, 75012 PARIS, FRANCE
Email: ypothier@abi.snv.jussieu.fr
Site : http://pegase.unice.fr/~skylink/publi/cielextreme
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