Observer: Yann POTHIER (France)
Your skill: advanced (many years) Category: planetary nebula Constellation: CRV
Object data: Vmag=109.9; Bmag=10.3; 81"x81"; type IIIa+II; central star of Vmag=12.8; discovered by Herschel in 1785; ELCAT: [OIII, 496+501nm] = 4 x [Hbeta, 486nm]. RA/DE: 12h24.50m, - 18°47.6' (2000.0) Date and UT of observation: 06 February 1997, 18h30UT Location & latitude: La Clapiere Obs. (France, latN44 40 00, longE06 27 36) Site classification: rural, alt. 1650m (5500ft) Limiting magnitude (visual in UMi): 6.2 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: 145-312x Filters used: OIII
Description: at 125x & OIII, medium to large PN, faint,
homogeneous with very slight brightness
increase towards the core, hard to tell if there is internal
details; diffuse borders and mag13 central star easy to see; estimated
diameter about 136".
