Observer: Yann Pothier (France)
Category: planetary nebula Constellation: PUP Object data: Vmag=12.0; Bmag=12.6; 19"x19"; type IV; central star of Vmag=16.11; discovered by Herschel in 1837; ELCAT: [OIII, 496+501nm] = 17 x [Hbeta, 486nm]. RA/DE: 07h47.43m, -27°20.1' (2000.0) Date and UT of observation: 24 December 1997, 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): 2 Seeing (1 to 5 - best to worst): 3.5 Moon up (phase?): no Instrument: Coulter 445mm/17.5" F/4.5 Magnification: 400x Filters used: OIII, UHC, Hbeta
Description: at 400x and OIII, small to medium sized PN, medium brightness, round and omogeneous; estimated diameter of about 29" (on drawing); UHC has a good contrast gain, OIII a very good one and Hbeta has no effect; the PN is larger through OIII filter; a mag14 star is just detached form the NW edge; NGC 2453, an open cluster of 15-20 stars between mag11 and 13 with one of mag9 against the NW border, stands 9' away.