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(IAAC) Abell 57 (PK 58+6 1; PN G058.6+06.1)
Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Date and UT of observation: 30 July 1997, about 01h30 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 57 (PK 58+6 1; PN G058.6+06.1)
Category: Planetary Nebula
Constellation:VUL
Object data: Vmag=3D14.7; dim.36"x32"; type IIIb; central * Vmag=3D17.4;
discovered by Abell in 1955.
RA/DE: 19h17.1m, +25=B037' (2000); Uranometria 161
Description: at 211x and OIII, medium sized PN, extremely faint even with
filter (invisible without filter at any power); but visible with OIII from
74x to 400x; round and homogneneous with ill-defined edges; estiamted
diameter of 34"; UHC has a weak contrast gain, OIII a good one and Hbeta is
of no use; a mag12 star is 1.2'SE from the center.
I can provide a scanned drawing of Abell 57 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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