Observer: Yann POTHIER (France)
Your skill: advanced (many years) 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, -14°44.1' (2000.0) Date and UT of observation: 03 January 1995, 23h30UT
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): 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, of medium brightness,
round with quite sharp edges; estimated
to be 70" in diam., obviously annular (ring thickness
of 25"); a 45° section of the ring centered on the NW is less contrasty
than the rest; a central star of mag14 is somewhat eccentric, halfway between
the geometric center and the inner WNW edge of the ring; UHC provides a
good contrast gain and OIII a very good one; a mag12 star is 10" from the
SE border; this PN is located 6' to the N of M46's central
area.