(IAAC) K 1-17 (PK 51+6 1; PN G051.5+06.1)

Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Date and UT of observation: 02 August 1997, about 00h05 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
Seeing (1 to 5 - best to worst): 4 (stellar stars until 125x)
Moon up (phase?): no
Instrument: Coulter 17.5" F/4.5
Magnification: 211x
=46ilters used: UHC, OIII, Hbeta
Object: K 1-17 (PK 51+6 1; PN G051.5+06.1)
Category: Planetary Nebula
Constellation: SGE
Object data: Vmag=3D15.2; dim.58"x45"; type IV; central * of Vmag=3D18.6;
discovered by Kohoutek (1963).
RA/DE: 16h27.5m, +27=B054' (2000); Uranometria 114
Description: at 211x and UHC, medium to large PN, round and homogeneous
with ill-defined edges, extremely faint, never seen without filter; seen
with UHC or OIII from 125x to 312x; estimated diameter of about 52"; UHC
and OIII filters have both a small contrast gain (but real) and Hbeta is of
no help at all; 2 stars of mag14 and 15 are to the N of the nebula.
I can provide a scanned drawing of K 1-17 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	tel: 01 43 41 43 29
11 impasse Canart, 75012 PARIS, FRANCE
Email: ypothier@abi.snv.jussieu.fr
Site : http://pegase.unice.fr/~skylink/publi/cielextreme
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