(IAAC) NGC 3587 (M97) - 8" F/10

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: 29 December 1991, morning
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
Moon up (phase?): no
Instrument: Meade SCT 8"/203mm  f/10
Magnification: 87-312x
Filters used: OIII
Description: at 87x, with OIII, nice nebula, large PN, diffuse and
homogeneous, soft edges, medium brightness; at 145x, much better defined
with OIII (an owl's dark eye is suspected on the SE side of the PN at
312x); located 20' from a mag6-7 star; exactly round.
I can provide a scanned drawing of Messier 97 to anyone who can read the
binhex encoding of Eudora (for Mac); just mail me to try
(yann.pothier@fnac.net), it works quite often with other configurations...
Yann Pothier
11 impasse Canart, 75012 PARIS, FRANCE
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