(IAAC) NGC 2440 - 17.5" F/4.5

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: 02 January 1995, 00h30UT
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
Description: at 312x, medium sized PN, very bright, oval SW-NE, about
69"x38", with ill defined adges; brighter towards the center, very small
and bright nucleus (smaller than 8"); a plume or elongated extension leaves
the nucleus in a ENE direction (28"x9"); UHC provides a good contrast gain
and OIII a very good one; at low powers, a bluish tint is obvious; a mag14
star is 20" from the S edge; a mag8.5 star is 4' to the E.
I can provide a scanned drawing of NGC 2440 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
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