[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: Picking a Mark IV Lens
Tom Droege wrote:
> For variable star fans, it looks like the equipment costs for finding
> new variable stars might work out to $5 - $20 per star. Cheap!
> Assuming that we measure 100,000 stars with the Mark IIIs and that
> they cost me about $30,000 and that 1% of the stars measured will be
> variable, then we should get $30 variables with the Mark III program.
> Almost a fixed cost per star found. I have been doing these estimates
> in various forms since I started. The numbers have not changed much.
> They get even more constant if you include other costs.
I think the Mk III does a little better then that. We already have
more then twice your 100K stars and have only covered 8 hours of RA.
Just the first three zip files in Michael's ftp archive (B*.ZIP)
together contain about 950,000 detections. Assume a 50% "keepper
ratio" and Glenn got 50K stars in three nights. So the MkIII is
down in the $5 to $10 range.
> This just to show that engineers think differently from most
> scientists. Cost is always a part of engineering decisions.
I can't say how many times my boss has given me a bottom line number
and told me to build a spreadshet that adds up to that total.
The technical engineering term is of course "Design to cost."
--Chris Albertson home: email@example.com
Redondo Beach, California work: firstname.lastname@example.org