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(IAAC) Abell 12 (PK 198-06.1; PN G198.6-06.3) - 17.5" F/4.5
Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Date and UT of observation: 23 December 1997, about 21h40 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 with averted vision 20% of the time
Transparency (1 to 5 - best to worst): 1
Seeing (1 to 5 - best to worst): 3.5
Moon up (phase?): no
Instrument: Coulter 17.5" (445mm) F/4.5
Magnification: 211x
=46ilters used: OIII, UHC, Hbeta
Object: Abell 12 (PK 198-06.1; PN G198.6-06.3; PK 198-6 1; ARO 220)
Category: planetary nebula
Constellation: ORI
Object data: Vmag=3D12.4; Bmag=3D13.9; dim.37"x37"; type ?; central star of
Vmag=3D19.1; discovered by Abell in 1955; ELCAT: [OIII, 496+510nm] =3D 16 x
[Hbeta, 486nm].
RA/DE: 06h02.4m, +09=B039' (2000); Uranometria 181
Description: at 211x and OIII, medium sized PN; between faint and medium in
brightness, round and homogeneous with ill-defined edges, estimated
diameter of about 29" (on drawing); Mu ORI of mag4 (white or maybe
yellowish) is too close at 50"E and you have to move it out of the field to
see the PN better; UHC has a slight contrast gain, OIII a good one and
Hbeta has no effect.
I can provide a scanned drawing of Abell 12 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
11 impasse Canart, 75012 PARIS, FRANCE
ypothier@abi.snv.jussieu.fr
ypothier@closun.snv.jussieu.fr
http://www.astrosurf.org/cielextreme
http://www.astrosurf.com/cielextreme
http://astrosurf.org/skylink/publi/cielextreme,
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