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(IAAC) NGC 2371/2 -17.5" F/4.5



Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Object: NGC 2371-2 (PK 189+19.1; PN G189.1+19.8; ARO 45)
Category: planetary nebula
Constellation: GEM
Object data: Vmag=11.2; Bmag=13.0; 54x35"; type IIIa+VI; central star of
Vmag=14.8 (Bmag=12.5); discovered by Herschel in 1785 (as a PN by Pease in
1917); ELCAT: [OIII, 496+501nm] = 9 x [Hbeta, 486nm].
RA/DE: 07h25.60m, +2929.5' (2000.0)
Date and UT of observation: 01 Janvier 1993, 03h30TU
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): 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, bright, globaly oval shaped
SW-NE, with quite sharp edges; 2 lobes are visible, _the NE one is 35"x24"
in a NW-SE axis and contains in its SE half a brighter triangluar area,
_the SW one is 38"x25", brighter than the first one and elongated in the
same axis, and contains in its NW half a brighter circular knot (about
diam.15") which has a stellar nucleus (still stellar with prism so it is
not a star); the central star is easily visible in the middle area (of very
weak surface brightness), quite dark around the star, of about mag14; the
nebula is globaly 70"x40"; UHC has a small contrast gain and OIII a good
one; already seen at 45x, elongated, small and nebulous, even without
filter; a mag13 star is 1' to the WNW.

I can provide a scanned drawing of NGC 2371-2 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
yann.pothier@fnac.net
http://www.astrosurf.org/cielextreme
http://www.astrosurf.com/cielextreme
http://astrosurf.org/skylink/publi/cielextreme,


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