[AZ-Observing] Re: Changes in 17P/Holmes in Six Hours
- From: "Spencer, Darrell" <DSpencer@xxxxxxx>
- To: <az-observing@xxxxxxxxxxxxx>
- Date: Thu, 25 Oct 2007 11:04:13 -0700
Is there any idea as to the duration of this outburst? Was last night
the peak? Will the "evolution" of the coma involve a return to the sub
Mag 15 realm in just a few days? Can this behavior even be predicted?
Darrell Spencer
-----Original Message-----
From: az-observing-bounce@xxxxxxxxxxxxx
[mailto:az-observing-bounce@xxxxxxxxxxxxx] On Behalf Of Brian Skiff
Sent: Thursday, October 25, 2007 11:01 AM
To: az-observing@xxxxxxxxxxxxx
Subject: [AZ-Observing] Re: Changes in 17P/Holmes in Six Hours
>> >At UT 25 October 2007 06"00 V=3D 2.362 ....
Jeff, for this to be useful we'll need to know the aperture used,
that is, the diameter of the photometer diaphragm (analog or digital).
The comet magnitude will depend greatly on how much light is
included, much as with a galaxy magnitude. Even better would be
to have several progressively larger apertures so one could
contruct a curve-of-growth plot that could be expolated to a
true "total" magnitude.
When I went home this morning about 2am, I too noticed the comet
was brighter than in the evening, and in any case, brighter than
the earlier reports from Japan and Europe, so we may have been=20
lucky in catching it near peak brightness. As Tom implies, the real
fun may be still to come as the coma changes structure and the
outburst event evolves.
\Brian
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