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(IAAC) Berkley 97 - 24inch F/15



Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Date and UT of observation: 31 July 92, ab.02hUT
Location & latitude: Chateau-Renard Obs. (France, latN44 40, longE06 28)
Site classification: mountain, alt.2990m (9000ft)
Limiting magnitude (visual): 6,5
Seeing (1 to 5 - best to worst): 3
Moon up (phase?): no
Instrument: Cassegrain 24inch F/15
Magnification: image intensifier + video camera
Filters used: no
Object: Berkley 97
Category: open cluster
Constellation: Cep
Object data:  diam.6' - 12 stars of v9.3 and fainter - trumpler type III1p
RA/DE: 22h39.5m, +5901'
Description: small cluster centered on deux quite bright stars (estimated
to be mag10) and separated by 40" in PA140/320; 5 stars of mag12 and about
20 faint stars of mag14-15 are scattered on a diam.2' area.
This is not a purely visual observation properly speakink but I have
experimented that this 24" intensified image on video screen ressembles a
visual sighting (with some extra infrared)...

I can provide an "intensified" image (24" telescope) of Berkley 97 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