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(IAAC) Berkley 10 - 8inch F/10



Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Date and UT of observation: 25 December 92, ab. 02hTU
Location & latitude: La Clapiere Obs. (France, latN44 40 00, longE06 27 36)
Site classification: rural, alt.1650m (5500ft)
Limiting magnitude (visual): 6,0
Seeing (1 to 5 - best to worst): 3
Moon up (phase?): no
Instrument: Meade 8inch F/10
Magnification: 87x, 145x
Filters used: no
Object: Berkley 10
Category: open cluster
Constellation: Cam
Object data: diam.12' - 50 stars of v12.5 and fainter; trumpler type II3p
RA/DE: 03h39.4 +66 32
Description: medium sized cluster, quite faint, quite totally diffuse; 2
"polar" knots are apparent on this diffuse patch of 6.7' in diameter (it
ressembles the planetary PK164+31.1/PN G 164.8+31.1); one knots stands on
the Northern side and shows a mag14 star; one on the southern side looks
grainy and some very faint star are separated with indirect vision
depending on the seeing; some mag12-13 stars are scattered outside of the
cluster; a mag10 star stands 20' to the SSE.
I can provide a scanned drawing of Berkley 10 to anyone who can read the
binhex encoding of Eudora (for Mac); just mail me to try
(ypothier@abi.snv.jussieu.fr)
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