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(IAAC) NGC 2392 - 4.25" F/7.8
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, +20°54.8' (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: Japanese Newtonian 4.25" (114mm), F/7.8
Magnification: 72-150x
Filters used: prism
Description: visible at 36x as a fuzzy star, making a nice couple with a
mag8 star 5' to the N; at 72x, always easier to detect this planetary when
star-hopping with this power; larger with a quite obvious central star
embedded in a nebulous halo, brighter to the center; at 150x, quite
homogeneous, large and perfectly round, estimated to be about 40".
I can provide a scanned drawing of NGC 2392 to anyone who can read the
binhex encoding of Eudora (for Mac); just mail me to try
(yann.pothier@fnac.net), it works quite often with other configurations...
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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