(IAAC) NGC 2346 -17.5" F/4.5

Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Object: NGC 2346 (PK 215+03.1; PN G215.6+03.6; ARO 80; M 1-10, Sa 2-5)
Category: planetary nebula
Constellation: MON
Object data: Vmag=11.6; 60x60"; type IIIb+VI; central star V651 Mon of
Vmag=11.16-13.40 (period= 17.2 days); discovered by Herschel in 1785;
ELCAT: [OIII, 496+501nm] = 13 x [Hbeta, 486nm].
RA/DE: 07h09.38m, -0048.5' (2000.0)
Date and UT of observation: 02 November 1994, 05h00TU
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
Transparency (1 to 5 - best to worst): 1
Seeing (1 to 5 - best to worst): 2
Moon up (phase?): no
Instrument: Coulter 445mm/17.5" F/4.5
Magnification: 45-312x
Filters used: OIII, UHC, prism
Description: at 312x, medium to large PN, pretty well seen with UHC filter
and unsignificant without, located in a crowded stellar field; round,
estimated diameter of about 45", with a brighter elliptical area crossing
the nebula in a (roughly) E-W axis, about 40"x18" (slightly thinner on the
E side); obvious central star of mag10.5, and a mag12 star 20" from the E
border; OIII filter gives a very good contrast gain; nebula invisible at
45x, suspected at 74x; halo visible at 100x and object easy at 145x.
I can provide a scanned drawing of NGC 2346 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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