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(IAAC) Abell 46 (PK 55+16 1; PN G055.4+16.0)



Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Date and UT of observation: 01 August 1997, about 22h15 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
Seeing (1 to 5 - best to worst): 2 (stellar stars until 211x)
Moon up (phase?): no
Instrument: Coulter Newtonian 17.5" F/4.5
Magnification: x211
=46ilters used: UHC, OIII, Hbeta
Object: Abell 46 (PK 55+16 1; PN G055.4+16.0)
Category: Planetary Nebula
Constellation: LYR
Object data: Vmag=3D14.3; dim.78"x71"; type IIIb+II; central * Vmag=3D14.87v=
ar
(Bmag=3D14.3-16.0 in 0.4717day, Algol type variable); discovered by Abell in
1955; ELCAT: [OIII 4959+5007]=3D5x[Hbeta]
RA/DE: 18h31.2m, +26=B055' (2000); Uranometria 160
Description: at 211x and OIII, medium sized PN, extremely faint even with
filter (hard to draw, the dim red light is still too bright); seen with
filter from 74x and without filter from 125x and up; round and homogeneous;
estimated diameter about 78"; central star of mag15.5 with another of mag16
on the E edge; UHC has a little contrast gain, OII a good one and Hbeta is
of no help at all.
I can provide a scanned drawing of Abell 46 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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