Object(s): NGC 1535      Observer: Mark G.Birkmann   
Your skills: Intermediate (some years)      Date/time of observation: 10-7-99 10:00 UT      Location of site: New Haven, Missouri (Lat ~38, Elev ~700')      Site classification: Rural      Sky darkness: 4 <1-10 Scale (10 best)> Seeing: 4 <1-10      Seeing Scale (10 best)>      Moon presence: None - moon not in sky      Instrument: 40" f/5 dob      Magnification: 385x      Filter(s): OIII, H-beta, Orion Ultrablock      Category: Planetary nebula.      Constellation: Eri Data: mag 10.8  size 20" x 17"      Position: RA 4h:14.5m  DEC -12:44'   

Description:  The nebula was an evenly illuminated blue-green with a distinct central ring.  The central star was very bright and  a faint star was noted near the edge of the nebula. 

 
 
Object: NGC 1535 (PK 165-15.1; PN G206.4-40.5; ARO 22)      Observer: Yann POTHIER (France)   
Your skill: advanced (many years)       Category: planetary nebula      Constellation: ERI   
Object data: Vmag=9.6; Bmag=9.3; 20x17"; type IV+IIc; central star of Vmag=11.59; discovered by   
Herschel in 1785; ELCAT: [OIII, 496+501nm] = 16 x [Hbeta, 486nm].      RA/DE: 04h14.20m, -12°44.'   
(2000.0)      Date and UT of observation: 09 February 1997, 20h15TU      Location & latitude:   
La Clapiere Obs. (France, latN44 40 00, longE06 27 36)      Site classification: rural, alt.1650m (5500ft)   
Limiting magnitude (visual in UMi): 6.0      Transparency (1 to 5 - best to worst): 1 Seeing (1 to 5 - best   
to worst): 3      Moon up (phase?): no      Instrument: Coulter 445mm/17.5" F/4.5      Magnification: 312x   
Filters used: OIII, UHC, Hbeta   

Description: at 312x and OIII, medium sized PN, very bright, round with sharp edges (fuzzier without filter); at 74x, brighter to the center; at 312x, a central area only is brighter as in a typical double-shell PN and the central star is faintly visible; at 312x and OIII, this central area looks slightly annular (the central star is nor more visible); at 400x and OIII, this annular area looks larger; at low power, the bluish tint is quite evident; UHC gives a good contrast gain, OIII a very good one and Hbeta degrades the view (only the central area is left); a wratten 38A blue filter was tried with no contrast gain but acting as the Hbeta and leaving on the central part visible; estimated diameter of about 63"x55", central area is 33"x28" because the all is slightly elongated WSW-ENE; the central star of about mag14 is very difficult to substract form the central ring.