[vsnet-chat 868] Magnitudes, sequences, etc

["Bruce Sumner" <b.sumner@bom.gov.au>]

Thanks to Brian for the very insightful comments on photometry 
(vsnet-chat 864). Why don't you guys (and girls) out there hear him? 
I have been making CV charts now for over 20 years, and the hardest 
part is getting a sequence. Unfortunately many people who should know 
better are using GSC magnitudes as sequence stars. Don't fall into 
that trap - they are garbage. And the USNO A1.0 catalogue, which 
is extremely useful for the production of deep charts ( I use it 
regularly), is useless for the final accurate magnitude sequence.

I understand there are some folks in the northern hemishere  
currently testing the feasibility of producing CCD derived magnitude 
sequnces for CV's.  The work of Arne Henden, Kent Honeycutt, and of 
course, Brian Skiff, come to mind. Also Taichi Kato's VSNET charts 
and sequences deserve mention. BUT these folk are ALL professional 
astronomers . Where are you amateurs who could help. In particular is 
there someone in the southern hemishere who would like to get 
involved. You will gain the undying appreciation of fellow variable 
star observers for your work.

There is so much concern and consternation out there about magnitudes 
- why don't you get off your butts and do something about it? I 
really hope Brian's comments get through - good charts and sequences, 
properly published, are a thing of both beauty, usefulness and 
timelessness. Who wants to get involved in some very beneficial CCD 
sequence determinations?  

Bruce Sumner
Melbourne
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Bruce Sumner
National Meteorological Operations Centre
Bureau of Meteorology
Australia

email:  b.sumner@bom.gov.au
phone:  +613 9669 4349
fax:    +613 9662 1223
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