(IAAC) NGC 1535 -17.5" F/4.5

Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Object: NGC 1535 (PK 165-15.1; PN G206.4-40.5; ARO 22)
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, -1244.' (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.
I can provide a scanned drawing of NGC 1535 to anyone who can read the
binhex encoding of Eudora (for Mac); just mail me to try
(ypothier@abi.snv.jussieu.fr), it works quite often with other
Yann Pothier
11 impasse Canart, 75012 PARIS, FRANCE
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