(IAAC) NGC 6309 - 17.5" F/4.5

Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Object: NGC 6309 (PK 009+14.1; PN G009.6+48.2; ARO 66, He2-206)
Category: planetary nebula
Constellation: OPH
Object data: Vmag=11.5; Bmag=10.8; 19"x11" (32"x27" in IDB); type III+II;
central star of Vmag=12.8; discovered by Tempel in ???? (as a PN by
Pickering in 1882); ELCAT: [OIII, 496+501nm] = 16 x [Hbeta, 486nm].
RA/DE: 17h14.1m, -1255.0' (2000.0)
Date and UT of observation: 18 February 1994, 05h30 UT
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): 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
Description: at 312x, small PN, bright; elongated NNW-SSE, about 30"x19",
rugby-ball shaped; the NNW half is the brightest part of the nebula; mag12
star 12" from the NNW border; this nebula responds very well to OIII filter.
I can provide a scanned drawing of NGC 6058 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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