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(IAAC) IC 289 - 8" F/10



Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Date and UT of observation: 24 December 1992, late evening, about??h?? 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 with averted vision
Transparency (1 to 5 - best to worst): 1
Seeing (1 to 5 - best to worst): ?
Moon up (phase?): no
Instrument: Meade 8" F/10
Magnification: 145x
Filters used: UHC, OIII
Object: IC 289 (PK 138+02.1; PN G138.8+02.8; Hb 1; ARO 86)
Category: planetary nebula
Constellation: CAS
Object data: Vmag=13.2; 45"x30"; type IV+II; central star of Vmag=16.8;
discovered by Swift between 1888 and 1901 (as a PN by Hubble in 1921);
ELCAT: [OIII, 496+501nm] = 7 x [Hbeta, 486nm].
RA/DE: 03h10.3m, +6119' (2000)

Description: at 145x, seen with averted vision to the N of a mag10 star;
very faint PN, medium to large in size, a little larger and sharper with
UHC; hard to see with OIII but well defined and slightly oval along a
NNW-SSE, estimated to be 40"x30", quite homogeneous; mag14 star 20" from
the NE edge; mag10 star 1.6' to the SSE.

I can provide a scanned drawing of IC 289 to anyone who can read the binhex
encoding of Eudora (for Mac); just mail me to try
(ypothier@abi.snv.jussieu.fr), it works quite often with other
configurations...




Yann Pothier
11 impasse Canart, 75012 PARIS, FRANCE
ypothier@abi.snv.jussieu.fr
ypothier@closun.snv.jussieu.fr
http://www.astrosurf.org/cielextreme
http://www.astrosurf.com/cielextreme
http://astrosurf.org/skylink/publi/cielextreme,


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