(IAAC) NGC 2440 - 4.25" F/7.8

Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Object: NGC 2440 (PK 234+02.1; PN G234.8+02.4; ARO 47; Sa 2-14; bat nebula)
Category: planetary nebula
Constellation: PUP
Object data: Vmag=9.4; Bmag=10.8; 54"x22"; type V+III; central star of
Vmag=18.9; discovered by Herschel in 1790; ELCAT: [OIII, 496+501nm] = 20 x
[Hbeta, 486nm].
RA/DE: 07h41.88m, -1812.5' (2000.0)
Date and UT of observation: 15 February 1991, evening
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): ?
Moon up (phase?): no
Instrument: Japanese Newtonian 4.25" (114mm), F/7.8
Magnification: 36-180x
Filters used: prism
Description: found with prism at 36x as a stellar spectrum, of medium
brightness; at 72x, somewhat nebulous with a star at 5'E; small and
brighter central area with faint and small extensions melting gradually
with the background sky; at 180x, large and irregularly shaped; be careful
not to mistake the central brighter zone with a potential central star
[that is easily seen only on HST images].
Yann Pothier
11 impasse Canart, 75012 PARIS, FRANCE
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