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(IAAC) NGC 246 - 24.4" F/15



Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Object: NGC 246 (PK 118-74.1; PN G118.8-74.7; ARO 43)
Category: planetary nebula
Constellation: CET
Object data: Vmag=10.9; Bmag=8.0; 240"x210"; type IIIb; central star of
Vmag=11.95 (with Vmag=14.28 companion at 4"); discovered by W. Herschel in
1785; ELCAT: [OIII, 496+501nm] = 5 x [Hbeta, 486nm].
RA/DE: 00h47.00m, -1153.' (2000.0)
Date and UT of observation: 02 August 1995, 02h20UT
Location & latitude: Chateau-Renard Obs. (France, latN44 39, longE06 28)
Site classification: mountain peak, alt.2950m (8900ft)
Limiting magnitude (visual in UMi): 6.3 with averted vision
Transparency (1 to 5 - best to worst): 1
Seeing (1 to 5 - best to worst): 3
Moon up (phase?): no
Instrument: Cassegrain 24.4"/620mm F/15
Magnification: 900x
Filters used: none

Description: at 900x, faint and irregular ring but the purpose was to find
the central star's companion and it was accomplished at this power: the
faint star was separated from the main mag11 star but I did not recorded
the PA...

Note: double central star of Vmag=11.95+14.28 at 4" (to PA210, SSW?).


Yann Pothier
11 impasse Canart, 75012 PARIS, FRANCE
yann.pothier@fnac.net
http://www.astrosurf.org/cielextreme
http://www.astrosurf.com/cielextreme
http://astrosurf.org/skylink/publi/cielextreme,


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