(IAAC) Object: M45, Instrument: 16" Newtonian f/4.59

Observer:  Todd Gross
Your skill:  Intermediate 
Date and UT of observation: 09/05/97 0755 GMT
Location & latitude: 22 miles west of Boston, Ma. 42.3N
Site classification: Suburban
Limiting magnitude (visual): 5.3 (estimated) 4.9 (est) in vicinity of object
Seeing (1 to 10 - worst-best):  4-5
Moon up (phase?): No
Instrument: 16" Newtonian-dob w. 96/99% coatings f/4.59
Magnifications: 58x
Filters used: none and OIII
Object: M45
Object data:  Open cluster
The Pleiades was surprising at this aperture at this magnification. I expected 
a total loss. Obviously, I was too magnified to take in the whole cluster,
and I did not expect the view to be as good as through smaller scopes.
However, there was a surprise. Firstly, I was not able to make out the 
nebulosity surrounding M45. I may have to try a deep sky filter, or wait for
darker skies. The surprise was this.. at this aperture. filter-less, the sheer 
luminosity of this cluster is overwhelming. Unlike M37 which I also viewed, 
M45 has stars of varying magnitude, and is less dense. However, the 
brightest stars are so bright at this aperture that it is almost shocking to 
see so many extraordinarily bright stars in one field of view. Certainly 
affected my dark adaptation!
- Todd
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Email: toddg@weatherman.com    Work Phone# (617)725-0777