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(IAAC) Abell 78 (PK 81-14 1; PN G081.2-14.9) - 17.5" F/4.5



Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Date and UT of observation: 02 August 1995, about 23h45 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
Transparency (1 to 5 - best to worst): 1
Seeing (1 to 5 - best to worst): 2
Moon up (phase?): no
Instrument: Coulter 17.5"/445mm F/4.5
Magnification: 174x
=46ilters used: OIII, UHC
Object: Abell 78 (PK 81-14 1; PN G081.2-14.9)
Category: planetary nebula
Constellation: CYG
Object data: Vmag=3D13.4; dim.101"x101"; central star NSV 13798 of Vmag=3D12=
=2E3;
discovered by Abell in 1955; ELCAT: Hbeta [486nm] =3D 29 x OIII [496+501nm]
RA/DE: 21h35.60m, +31=B041.0' (2000); Uranometria 121, Sky Atlas 9; correcte=
d
thanks to Guide at 21h35m29s, +31=B041'46";
Description: at 174x, medium to large PN, round about 85" in diameter with
very fuzzy edges even with filter (UHC and OIII both have a weak contrast
gain, in opposition with professionnal measurements of ELCAT shown above);
central star of mag12 easy to see; the center is very slightly darker; a
mag 11 star is at 1' of ENE border.
I can provide a scanned drawing of Abell 78 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://astrosurf.com/skylink/publi/cielextreme/index.html
         http://www.astrosurf.com/skylink/publi/cielextreme
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