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Comet ISON tonight

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#1 nytecam

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Posted 27 January 2013 - 05:58 PM

Comet ISON C/2012 S1 recorded tonight in Gemini over an hour above a very bright gibbous moon in the east - pics below via Meade 30cm f/3.6 SCT+SX Lodestar cam show motion over 48min - exp 5x30s [left] and 7x30s [right]. Comet's mag 16.0 @ 4AU [similar to planet Jupiter] according to NASA Horizons :grin:

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#2 canukLX90

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Posted 27 January 2013 - 06:05 PM

Nice capture. Thanks for posting. I haven't attempt to
image this comet yet. Weather not being nice here with
clear dark nights being really few and far between!

PJ

#3 Rich (RLTYS)

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Posted 28 January 2013 - 06:16 AM

Excellent images of a still rather faint comet. Thanks for the views.

Rich (RLTYS)

#4 stets

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Posted 28 January 2013 - 08:25 AM

the prospect of a bright comet is very exciting

#5 nytecam

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Posted 28 January 2013 - 01:41 PM

Thanks for your interest - my video clip here :grin:

#6 Centaur

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Posted 28 January 2013 - 06:23 PM

Thanks for sharing your marvelous pictures and video, Nytecam.

JPL has recently changed the magnitude parameters for C/2012 S1 (ISON). Peak brilliance at perihelion has been downgraded from -15.8 to -13.0. Of course the comet will only be especially bright when too close to the Sun to be observed by the masses. The media have become hyperbolic, as usual. Space.com is writing articles about how bright two comets will be this year. They do include a few caveats, but as might be expected, many readers only remember the superlatives. On various blogs they are talking about how night will become as bright as day. More conservative reporting would have allowed the public to become pleasantly surprised. Instead, they may become deflated.

I’ve updated my graphics for the comet to reflect the new magnitude estimates. They can be seen at: www.CurtRenz.com/comets

#7 Special Ed

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Posted 29 January 2013 - 06:12 AM

Maurice,

Nice pics! The video really gives a sense of how far one is looking out into the solar system to see this little iceball. :cool:

#8 BrooksObs

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Posted 29 January 2013 - 08:53 AM

Space.com is writing articles about how bright two comets will be this year. They do include a few caveats, but as might be expected, many readers only remember the superlatives.


How true. I reagard particularly misleading the illustration supposedly depicting Comet ISON on the evening 2013 November 30th that appears on Space.com. Having just rounded the Sun hours earlier any tail will be relatively short with much of the outer region strongly curved to the east, not rectilinear and pointing north. And as far as the projected -13.0 peak magnitude for ISON at perihelion posed by JPL's ephemeris, that too fails to reflect anything realistic, as comets with very small perihelia (the sungrazers and sunskirters) do not follow standard photometric formulae during their final few days before rounding the Sun. Instead they consistantly fall well short of what the formulae call for.

BrooksObs

#9 nytecam

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Posted 30 January 2013 - 04:44 PM

Tonight's [Jan 30] pic of Comet ISON a few degrees west [right] of Castor - my comet mag estimate, against Sloan DSS, is m15.95 = marked star :grin:

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#10 Dave M

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Posted 30 January 2013 - 05:48 PM

Nice pics and video.. :cool:

#11 nytecam

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Posted 07 February 2013 - 10:30 AM

Thanks everyone for your continued interest :bow: Another shot below from this morning just after midnight - data on image. The comet continues to be slightly fuzzy eg of non-stellar appearance and currently moving due west at near constant Dec but reducing RA :grin:

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#12 canukLX90

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Posted 08 February 2013 - 02:28 AM

Thanks for posting. An hour or so of clear dark sky here
tonight where I managed to get 5 X 3 min images of the
faint fuzz ball. I'll post once get them calibrated and
stacked.

PJ

#13 Rich (RLTYS)

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Posted 08 February 2013 - 06:26 AM

Thanks everyone for your continued interest :bow: Another shot below from this morning just after midnight - data on image. The comet continues to be slightly fuzzy eg of non-stellar appearance and currently moving due west at near constant Dec but reducing RA :grin:


Nytecam, you might have imaged Ison's tail. It seems to be pointing in a southeast(?) direction.

Rich (RLTYS)

#14 Special Ed

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Posted 08 February 2013 - 08:50 AM

Yes it looks like you got the tail--a fan tail pointing ESE? Maybe an inverted version would make it easier to see? :question:

#15 BrooksObs

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Posted 08 February 2013 - 10:55 AM

In examining the image the tail is seen to be directed toward a p.a. of close to 90 deg, which is somewhat trailing that of the calculated ERV. Thus, not unexpectedly, it must represent a rudimentary dust tail.

BrooksObs

#16 canukLX90

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Posted 10 February 2013 - 02:40 AM

Here is my imaging effort for the night of 07 February.
Stack of 5 X 3 minute at ISO 800 using DSLR and PowerNewt.
Stars down to mag 19 are just visible. The distance between
the two brightest stars is 1' 08". The comet is moving at
33.7"/hour at an earth distance of 4.0 AU and a sun distance
of 4.8 AU according to SkyTools.

PJ

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#17 canukLX90

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Posted 10 February 2013 - 07:13 PM

Here is the stack aligned on the comet. The nucleus is
clearly defined with tail..the previous stack was aligned
on the stars blurring the comet....ooops!

PJ

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#18 Special Ed

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Posted 10 February 2013 - 09:03 PM

Great job, PJ. It's amazing that you imagers can capture such a small, faint, distant object.






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