Subject: Re: LSST exposure time calculator
From: Alan W Harris
Submitted: Wed, 10 Sep 2003 12:35:16 -0700
Message number: 169
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Thanks, nice toy. I ran a couple calculations to see how asteroid surveys
go in different fileters. I adjusted the magnitude threshold according to
mean colors of asteroids (I'm not sure of the value for I) to correspond to
uniform detection threshold of an object across various filters:
band mag exp,s
B 24.8 35.8
V 24.0 13.8
R 23.6 13.8
I 23.2 22.5
V+R 24.0 9.8
The last row is a putative V+R band filter, which should reach the V=24.0
magnitude target in 1/sqrt(2) times less time than either R or V. As long
advertized, V and R are about equally effective for asteroid detection, and
R+V is of course optimum. Anything outside of the V,R range is not very
effective. Images taken in B or I band are probably worth examining for
asteroids, but won't add much to survey coverage; images in any other band
will take too long exposure to allow effective detection of moving asteroids.
At 08:36 AM 9/10/2003, Knut Olsen x204 wrote:
>With significant input from Tony Tyson and help from many others, we have
>prepared a web-based exposure time calculator for LSST. We hope it
>will be useful for calculating the single-exposure and survey depths
>of the LSST Point Design, as well as for exploring the impact of
>changing that design on the science case.
>
>To access the ETC, go to http://www.ctio.noao.edu/lsst/etc/. We would
>appreciate any and all feedback.
>
> Knut Olsen and Chris Smith
>
>
>
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*******************************************************************
Alan W. Harris
Senior Research Scientist
Space Science Institute
4603 Orange Knoll Ave. Phone: 818-790-8291
La Canada, CA 91011-3364 email: harrisaw@colorado.edu
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