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(IAAC) NGC 2392 - 8" F/10



Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Object: NGC 2392 (PK 197+17.1; PN G197.8+17.3; ARO 24; clown nebula)
Category: planetary nebula
Constellation: GEM
Object data: Vmag=9.1; Bmag=9.9; 47x43"; type IIIb+III; central star HD
59088 of Vmag=10.5 (Bmag=9.1); discovered by Herschel in 1786 (as a PN by
Lassell in 1853); ELCAT: [OIII, 496+501nm] = 16 x [Hbeta, 486nm].
RA/DE: 07h29.16m, +2054.8' (2000.0)
Date and UT of observation: 28 December 1991, 03h30TU
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 indirect vision 25% of the time
Transparency (1 to 5 - best to worst): 2
Seeing (1 to 5 - best to worst): 3
Moon up (phase?): no
Instrument: Meade SCT 8" (203mm), F/10
Magnification: 87-145x
Filters used: -

Description: at 45x, just visible as a nebulous star, easy and bright PN;
at 87x, obvious central star, mag9 star 1.7' to the N; at 145x, large
nebula, gradually merging with the background sky; at 290x, a mag13 star is
forming a triangle with N2392 and the mag9 star, the nebula is larger but
still homogeneous.


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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