[AZ-Observing] Re: A Mystery... Can you help me solve it ??
- From: "David M. Douglass" <dmdouglass@xxxxxxxxxxxxxxx>
- To: <az-observing@xxxxxxxxxxxxx>
- Date: Thu, 19 Feb 2015 15:16:55 -0700
Brian.... (and others)
My Bad ....
The DEC is -05:17:01 I forgot the minus sign!
A few people on Cloudy Nights have chimed in, and sort of agree.
One fellow (Rick J) even had a neat comparison photo... now he caught a LOT
of them....
You can see it here:
http://www.spacebanter.com/attachment.php?attachmentid=2683&stc=1
His was a 40 minute exposure !!!
David M. Douglass
dmdouglass@xxxxxxxxxxxxxxx (secondary)
david@xxxxxxxxxxxxxxx (main)
Cell (602) 908-9092
-----Original Message-----
From: az-observing-bounce@xxxxxxxxxxxxx
[mailto:az-observing-bounce@xxxxxxxxxxxxx] On Behalf Of Brian Skiff
Sent: Thursday, February 19, 2015 2:51 PM
To: az-observing@xxxxxxxxxxxxx
Subject: [AZ-Observing] Re: A Mystery... Can you help me solve it ??
On Thu, 2015-02-19 at 14:10 -0700, Victor Herrero wrote:
> In two pairs, the waviness matches exactly, they look like tracks made
> by drifting star pairs see :
> http://herrero-victor.blogspot.com/2015/02/david-m-douglass-observatio
> ns-probable.html
>
> Victor :)
Good catch on Victor's part. This certainly looks like the flotilla of
geostationary sats that one can see in wide-field shots. So the idea is that
these were hardly moving themselves, but your doing the sidereal tracking made
them streak across the images, and any larger irregularities or jumps in the
tracking made them jiggle, and the really small-scale jitter is from seeing.
When we ran the LONEOS Schmidt hunting for NEOs, we'd often see groups of
four to six of the geostationary objects (mostly non-functional junk
presumably) go through the fields in parallel arrays maybe 15' across. They
would not necessarily be at the magic -5.5 deg Dec, but near, and also not
drifting E-W, but instead at some angle as a result of their no longer being
controlled on-station, but floating free.
\Brian
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