(IAAC) Obj: Trumpler 1 = Collinder 15 - Inst: Astroscan 4,1" f440mm Widefield

Observer: Martin Baur
Your skills: Intermediate (some years)
Date/time of observation: 25.01.2000 20:15 MET
Location of site: clearing near Hofgeismar, Germany (Lat +51, Elev 820ft)
Site classification: Exurban
Sky darkness: 5,5 <Limiting magnitude>
Seeing:  <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: Astroscan 4,1" f440mm Widefield
Magnification: 16x 21x
Object(s): Trumpler 1 = Collinder 15
Category: Open cluster.
Class: I 3 p
Constellation: Cas
Data: mag 8,1  size 4,5'
Position: RA 01:35.6  DEC +61:18
This cluster is my problem child at the moment. I was sure I had seen it last
year on 11.09.99. But now I'm suddenly insecure. In my notes of my latest
observation I wrote: not sure, very small, almost star-shaped, still to
confirm. If it had really been a star I think I could have seen it with
direct vision. But I saw it only with averted vision as a fuzzy point.
The location where I saw the point suits to the entry of Tr 1 in Sky Atlas
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