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(IAAC) IC 10 - 17.5-inch F/4.5



Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Date and UT of observation: 27 July 95, 00h00-00h50UT
Location & latitude: La Clapiere Obs. (France, latN44 40 00, longE06 27 36)
Site classification: rural, alt.1650m (5500ft)
Limiting magnitude (visual): 6.3 averted vision 33% of the time on UMi stars
Seeing (1 to 5 - best to worst): 2
Moon up (phase?): no
Instrument: Coulter 17.5" F/4.5
Magnification: 87x, 145x
Filters used: (UHC, OIII) + without
Object: IC 10
Category: galaxy Irr
Constellation: CAS
Object data:  v10.3 / 7.3'x6.4' / SB=15.3 / PA 40d / =UGC 192
RA/DE: 00h20.4m, +5918' (2000)
Description: tough target= medium size galaxy extremely faint; irregularly
shaped, it has ill defined edges and appears homogeneous; a brighter part
about 1.8'x1.4' E-W (PA90/270) includes a mag13 star and 2 mag15 others; a
fainter area is extending to the NNW (PA150) and amkes about 2.2x1.6' NE-SO
and includes a mag14 star and 2 of mag15; a 8' line of 8 faint stars
(mag14-15) crosses the NNW fainter part in a WSW-ENE axis; a triangle of
mag12 stars is to be found at 12'SW; UHC and OII filters are somewhat
enhancing the overall contrast (without details), because of the numerous
HII regions this galaxy shows, but a larger scope (or a better sky) could
focus on which part of the galaxy it enhances exactly.

I can provide a scanned scheme of IC 10 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
configurations...



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