(IAAC) NGC 2438 - 8" F/10

Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Object: NGC 2438 (PK 231+04.2; PN G231.8+04.1; ARO 46; Sa 2-13)
Category: planetary nebula
Constellation: PUP
Object data: Vmag=10.8; Bmag=10.1; 68"x68" [internal=90", external=137" in
IDB]; type IV+II; central star of Vmag=17.5; discovered by Herschel in
1827; ELCAT: [OIII, 496+501nm] = 12 x [Hbeta, 486nm].
RA/DE: 07h41.83m, -1444.1' (2000.0)
Date and UT of observation: 29 December 1988, ...
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: Meade SCT 8" (203mm), F/10
Magnification: 87-145x
Filters used: OIII

Description: at 87x, quite obvious in M46 with a mag11 star in contact to
the NE; at 145x, this star gives the nebula a triangular shape but at 312x,
its shape is better defined, quite round and diffuse; a faint star of mag14
is quite centraly located in the nebula, visible only briefly with averted
vision [the real central star is much fainter]; slightly annular but the
ring is more obvious at 145x with OIII, quite sharp edges.

Yann Pothier
11 impasse Canart, 75012 PARIS, FRANCE

To UNSUBSCRIBE from the 'netastrocatalog' lists, use the Web form at: