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Moving object in Chris' list
- To: tass@wwa.com
- Subject: Moving object in Chris' list
- From: aah@nofs.navy.mil
- Date: Mon, 25 May 98 08:11:36 -0700
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- Resent-Date: Mon, 25 May 1998 11:24:30 -0400
- Resent-From: tass@wwa.com
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I'm back in town for a week before heading out for my next trip. Such fun!
The mag16 catalog is a specific extraction from USNO-A. As I think I
mentioned when I created it, the catalog has the following constraints:
Dec between -5 and +5
object has valid b & r magnitudes
transformed V magnitude brighter than V=16
Note that the 'moving object', which Michael Richmond found in the full
USNO-A catalog, has an invalid blue magnitude, which is why it was not
included in mag16.
USNO-A is limited by the POSS-I plate material, and has problems with
stars brighter than 12th magnitude since the images are large and distorted
by spikes and halos. Dave has done a good job of eliminating as many of the
false hits (such as along spikes) as possible, and usually there is one 'hit'
near the center of such saturated images that corresponds to the magnitude
and position of the actual star. Probably a better mag16 catalog would use
USNO-A to 12th magnitude, and Tycho for brighter stars...I intended to make
such a collated catalog but other activities interfered.
Chris, what kind of match radius were you using for these 13 objects?
Why did you only have a maximum of 6 hits/object when you were using
data from 3 sites (9 cameras)?
Arne