(IAAC) M 1-16 (PK 226+05.1; PK 226+5.1) - 17.5" F/4.5

Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Date and UT of observation: 08 February 1997, about 21h45 UT
Location & latitude: La Clapiere Obs. (France, latN44 40 00, longE06 27 36)
Site classification: rural, alt.1650m (5500ft)
Limiting magnitude (visual in UMi): 6.31 with averted vision (25% of the time)
Transparency (1 to 5 - best to worst): 1
Seeing (1 to 5 - best to worst): 3
Moon up (phase?): no
Instrument: Coulter 17.5" (445mm) F/4.5
Magnification: 211x
Filters used: UHC, OIII, Hbeta
Object: M 1-16 (PK 226+05.1; PK 226+5.1; Sa 2-11; ARO 239)
Category: planetary nebula
Constellation: MON
Object data: Vmag=13.0; dim.>3"; type ?+VI PN; central star of Vmag=16.94;
discovered by Minkowski in 1946; ELCAT: [OIII, 495+501nm] = 18 x [Hbeta,
RA/DE: 07h37.3m, -0939' (2000); Uranometria 274
Description: at 211x and OIII, stellar PN and faint, about mag13
(12.5-13.0); with a suspected brighter center (?); UHC has a good contrast
gain, OIII a very good one and Hbeta has no positive effect; mag13 stars at
40"NNW and 60"SSE.
I can provide a scanned drawing of M 1-16 to anyone who can read the binhex
encoding of Eudora (for Mac); just mail me to try
(ypothier@abi.snv.jussieu.fr), it works sometimes with other
Yann Pothier
11 impasse Canart, 75012 PARIS, FRANCE
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