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Re: C/2012 S1 (ISON)

Posted: December 3rd, 2013, 10:54 pm
by Christopher K.
Comet ISON is at about magnitude 4.4 and expected to dim drastically in the next week. In CBET #3731, Dan Green notes the nucleus of ISON was compromised during perihelion.

NOAA is forecasting at least seventy percent cloud cover for the south Baton Rouge area through at least next Monday night, and so I don't know if anyone from this Earthly vantage point will get one last glimpse of bright glory from this comet.

The Hubble Space Telescope will look at ISON as soon as the comet is far enough from the Sun to look safely (even telescopes have to be careful).

For what it's worth, these are the 5:15am coordinates for ISON for the next few mornings...
4 December = below horizon
5 December = below horizon
6 December = below horizon
7 December = below horizon
8 December = alt 2˚ / az 91˚ [at magnitude 5.6?]
9 December = alt 4˚ / az 90˚ [2˚53' S of 9 Herculis]
10 December = alt 6˚ / az 88˚ [1˚00' SW of 9 Herculis]

During all mornings listed above, ISON is in Serpens Caput.

Re: C/2012 S1 (ISON)

Posted: January 3rd, 2014, 1:34 am
by Christopher K.
The Astronomical League has created a certificate for anyone who had the opportunity to see ISON before its ill-fated rendezvous with the Sun. An observer, on the honor system, can download the certificate directly from the AL website.

The certificate: ... ficate.pdf

Re: C/2012 S1 (ISON)

Posted: February 3rd, 2014, 5:15 pm
by Christopher K.
There was some talk going around that some of the large amounts of dust produced by ISON may produce meteors around 15 January. The predicted radiant was to be near Eta Leonis. I have not seen any positive reports of ISON meteors.

An AMS posting from Robert Lunsford: ... omet-ison/

Re: C/2012 S1 (ISON)

Posted: March 3rd, 2014, 4:49 pm
by Christopher K.
There is another ISON photo contest, and it's sponsored by the National Science Foundation, and Astronomy and Discover magazine. Astronomy Editor David Eicher will announce and show the winner photos at this year's Northeast Astronomy Forum on 12 April. The prizes total up to $2500.

About NEAF:

Re: C/2012 S1 (ISON)

Posted: March 5th, 2014, 4:49 pm
by Christopher K.
There is a fascinating article by Zolt Levay illustrating the effort that is used to process a single Hubble image so that it is ready for "public consumption". The image in question, taken of ISON on 30 April, was used as the January image for this year's NASA Science wall calendar.

ISON is an acronym for the Russian International Science Observation Network. The comet is believed to have originated in the Oort Cloud.

The article: ... comet-ison

Re: C/2012 S1 (ISON)

Posted: January 16th, 2015, 6:56 pm
by Christopher K.
The image chosen for the January section of this year's NASA Science calendar is actually a time-lapse series from SOHO showing the ISON whipping around the Sun from 28 November to 1 December. As we all know, ISON didn't survive.

Here's a very similar image... ... and-going/