[AZ-Observing] Re: Comet Catalina
- From: Brian Skiff <bas@xxxxxxxxxx>
- To: az-observing@xxxxxxxxxxxxx
- Date: Fri, 18 Dec 2015 16:44:34 -0700
On Fri, 2015-12-18 at 15:22 -0700, Richard Harshaw wrote:
All the measurements made since it was discovered by John Herschel in 1828
fit inside a 1-arc sec circle. This pair is probably physical, but if it is
in a mutual orbit, it must be large and of extremely long period.
Right, the fixed orientation and large motion
essentially guarantee they're physical. But yes,
the notional orbit would be tens or hundreds of
thousands of years.
Nice comet, too! (The sky is rich)
\Brian
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