[Aavso-photometry] NEw or used CCD's

[David Higgins]

It depends what you mean by ‘useful’.  I do AAVSO variables but my main area
of work is Minor Planet Photometry – specifically the search for and
analysis of Binary Asteroids.   You need a scope larger than 0.30m
(typically) to do 1-2% photometry on these moving targets at mag 15-16 – but
that’s unfiltered.  Filtered and you need a much larger scope (0.5m or
bigger)

 

The Binary Stars that I have uncovered have been around mag 13 and are not
moving so an 0.25m or larger would be best for filtered analysis (UBVRI).
For V only an 8” will let you do good CCD photometry on most AAVSO
variables.

 

Cheers

 

David

 

From: BFerguson at ucok.edu [mailto:BFerguson at ucok.edu] 
Sent: Saturday, 1 December 2007 10:14 AM
To: David Higgins
Cc: aavso-photometry at mira.aavso.org
Subject: Re: [Aavso-photometry] NEw or used CCD's

 

Being new to CCD, I have a different question..  How large a scope does one
need to do useful work.  I have done PEP using a 30 year old C-8 and Optec
SSP-3 using Jeff Hopkins software.

 

I also bought his book on using the close-out Meade DSI Pro and have
constructed a photometer using his method.

 

The C-8 is not my only scope; I also own a Meade AR6, Orion 120ST and Orion
127 Mak-Cas and I have both a Celestron CG-5 Goto and Vixen GP2 mount.
Smaller is certainly more portable, but will it work for photometry?

 

Brad Ferguson

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