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(IAAC) Abell 53 (PK 40-0 1; PN G040.3-00.4)



Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Date and UT of observation: 07 July 1994, about 23h00 UT
Location & latitude: La Clapiere Obs. (France, latN44 40 00, longE06 27 36)
Site classification: rural, alt.1650m (5500ft)
Limiting magnitude (visual in UMi): 6.2
Seeing (1 to 5 - best to worst): 2 (based on naked eye scintillation)
Moon up (phase?): no
Instrument: Coulter 17.5" F/4.5
Magnification: 125x
=46ilters used: UHC, OIII
Object: Abell 53 (PK 40-0 1; PN G040.3-00.4)
Category: Planetary Nebula
Constellation: AQL
Object data: Vmag=3D15.5:; dim.31"x31"; type IV; central * of Vmag=3D20.3;
discovered by Abell in 1955.
RA/DE: 19h06.7m, +06=B023' (2000); Uranometria 206
Description: at 125x, found with OIII filter, very difficult, comes and
goes according to seeing changes, visible during 75% of the time of
observation; small to medium in size, homogeneous with ill-defined edges:
to be seen with filter because nothing without; UHC has a good contrast
gain and OIII has very good one; estimated diameter of 40"; a mag13.5 star
is 1.4'N, a mag6 star is 17'NW.
I can provide a scanned drawing of Abell 53 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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