(IAAC) NGC 246 - 8" F/10

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; 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: 27 July 1990,
Location & latitude: La Clapiere Obs. (France, latN44 40 00, longE06 27 36)
Site classification: rural, alt.1650m (5500ft)
Limiting magnitude (visual in UMi): -
Transparency (1 to 5 - best to worst): 1
Seeing (1 to 5 - best to worst): 2
Moon up (phase?): no
Instrument: Meade SCT 8" (203mm), F/10
Magnification: 45-145x
Filters used: UHC

Description: at 45x, 2 stars on a quite round nebula; at 80x, better seen
with averted vision, 2 centrals stars and another on one side and 2 more
outside the disk; at 145x, with UHC, 3 "quasi-central" stars in triangle,
in a well visible homogeneous nebula.

Note: the low OIII/Hbeta ratio, typical of low excitation PNs (as for NGC
40, but less extreme case).

Yann Pothier
11 impasse Canart, 75012 PARIS, FRANCE

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