This page contains multiple drawings
 
 
 

Object: NGC 2392 (PK 197+17.1; PN G197.8+17.3; ARO 24; clown nebula)   Observer: Yann POTHIER (France)   Your skill: advanced (many years)      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: 26   December 1994, 23h30UT       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): 1      Seeing (1 to 5 - best to worst): 4      Moon up (phase?): no      Instrument: Coulter 445mm/17.5" F/4.5 Magnification: 45-312x      Filters used: OIII, UHC   Description: at 312x, medium sized PN (large with filter), bright and round; about 47" in diam. without   filter and 64" with OIII (estimated on drawing) because of a weaker external corona seen at 312x and   OIII; a brighter central area is seen, a little oval, about 30"x25" N-S; UHC provides a good contrast gain and erases the central star, OIII gives a very good contrast gain and the extended edges are getting sharper; the nebula looks bluish at 45x; the mag8.5 star is at 1.6'N from the central star.

 
 

Object(s): NGC 2392, Eskimo Nebula      Observer: Mark G.Birkmann   Your skills: Intermediate (some years)      Date/time of observation: 11-11-99, 8:50 UT, (2:50 am CST)   Location of site: New Haven, Missouri (Lat ~38, Elev ~700')      Site classification: Rural      Sky darkness: 6   <1-10 Scale (10 best)>      Seeing: 5 <1-10 Seeing Scale (10 best)>       Moon presence: None     Instrument:   40" f/5 dob      Magnification: lowest power 125x      Filter(s): OIII, H-beta, Orion Ultrablock      Category:   Planetary nebula.      Class: 3B + 3B      Constellation: Gemini      Data: mag 9.9(P)  size 19.5"      Position:   RA 07:29m 10.8s  DEC +20:54' 43"   Description:  This beautiful pn showed a bright inner ring surrounding the central star.  The area inside the ring was evenly illuminated and slightlydarker than the outer halo.  The lower part of the ring split for a short distance with a dark area in the separation equal in brightness to the nebulousity inside the main ring.  The outer halo was about 3x the diameter of the inner ring.  It was evenly illuminated except for a bright area near the top and a some what bright area on the right side.  I have seen so many photos of this object that the upper bright area may have been coming from my memory rather than from my retina.  This doesn't explain the bright area on the right though, since none of the photos I've seen show this to be a particularly bright area.