(IAAC) NGC 3587 (M97) - 2.5" F/13

Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Object: Messier 97, M 97, NGC 3587 (PK 148+57.1; PN G148.4+57.0; ARO 25, VV 59)
Category: planetary nebula
Constellation: UMa
Object data: Vmag=9.9; Bmag=12.0; 203"x199" (209" in IDB); type IIIa;
central star of Vmag=16.1; discovered by Mechain in 1781; ELCAT: [OIII,
496+501nm] = 12 x [Hbeta, 486nm].
RA/DE: 11h14.80m, +5501.0' (2000.0)
Date and UT of observation: 11 August 1991, early morning
Location & latitude: Chateau-Renard Obs. (France, latN44 39, longE06 28)
Site classification: rural, alt.2950m (8900ft)
Limiting magnitude (visual in UMi): 6.4
Transparency (1 to 5 - best to worst): 1
Seeing (1 to 5 - best to worst): 3
Moon up (phase?): no
Instrument: Zeiss 2.5"/63mm refractor f/13
Magnification: 30-70x
Filters used: -
Description: at 30x, round, quite faint, diffuse, 3 stars of mag6-7 in the
same field; at 70x, shape quite irregular, faint stars around.
Yann Pothier
11 impasse Canart, 75012 PARIS, FRANCE
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