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(IAAC) IC 972 - 17.5" F/4.5



Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Object: IC 972 (PK 326+42.1; Abell 37)
Category: planetary nebula
Constellation: VIR
Object data: Vmag=13.9; Bmag=14.9; 45"x43"; type IIc; central star of
Vmag=17.7; discovered by Javelle before 1903; ELCAT: [OIII, 496+501nm] = 11
x [Hbeta, 486nm].
RA/DE: 14h04.4m, -1715' (2000)
Date and UT of observation: 17 February 1994, late evening
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): 1.5
Seeing (1 to 5 - best to worst): 4
Moon up (phase?): no
Instrument: Coulter 445mm/17.5" F/4.5
Magnification: 125x
Filters used: OIII

Description: at 125x, small to medium sized PN, faint and just visible
without filter; somewhat elongated estimated to be about 80"x60", NNf-SSp;
gradually brighter to the center, fuzzy edges; good contrast gain with OIII
filter, maybe a little extension to the NW??; at 45x, invisible without
filter, visible with OIII; at 74x, visible without filter; no central star.

I can provide a scanned drawing of IC 972 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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