David's Astronomy Pages Images - Session 550 (2013-10-23)

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C/2012 X1 (LINEAR) - Comet   Variable Stars (photometric monitoring) - None   Nearby Stars (astrometric monitoring) - None

- Evening session (0.5 hrs duration).  Windy condition, poor seeing. - Session operated under semi-automated control, with remote monitoring from indoors computer.   - Ambient Temperature:  6°C minimum - CCD operation -25°C (at 69% average cooling).   - sole objectives of the session were to image C/2012 X (LINEAR) which is reported to have undergone an explosive eruption, similar to Comet Holmes in 2007. -

C/2012 X1 (LINEAR) - Comet

C/2012 X1 (LINEAR)  (Passing through starfield in Coma Berenicies. Sun Distance 2.25 AU) Located around 450 million km from Earth, Comet C/2012 X1 (LINEAR) has undergone an explosive eruption sometime around  21st Oct (2013-10-21). Amateur astronomers report that it underwent a 100-fold increase in the comet's brightness  compared to its predicted brightness.  (Spaceweather.com  page for 2013-10-22) The comet's atmosphere or "coma" now resembles that of exploding Comet 17P/Holmes in 2007.   Image below was taken  2013-10-23.76 UT. (Conditions : windy and poor seeing)
CCD Image ( cropped) 26 x 10 sec exposure (average combine, aligned on stars), 3x3 binning, C filter,  2013-10-23 18:20hUT (#550033-68) 12" LX200R  (at f/9.7) + ST-10XME
C/2012 X1 (LINEAR), detail
CCD Image, Linear Scale (cropped) 26 x 10 sec exposure (average combine, aligned on comet),  3x3 binning, C filter,  2013-10-23 18:20hUT (#550033-68) 12" LX200R  (at f/9.7) + ST-10XME		Processed CCD Image, Rotational Gradient (20 deg) Image details as left
Images of C/2012 X1 (LINEAR) on Comets 2013 Page >>
Comparison between C/2012 X1 (LINEAR) and 17P/Holmes at similar times after explosive eruption
C/2012 X1 (LINEAR), 2013-10-23		17P/Holmes, 2007-10-25
CCD Image, Linear Scale (55% & cropped) 26 x 10 sec exposure (average combine), 3x3 binning, C filter,  2013-10-23 18:20hUT (#550033-68) 12" LX200R  (at f/9.7) + ST-10XME		CCD Image, Log Scale 5 x 10s exposure (average combine),  2x2 binning, C Filter,  2007-10-25 20:45h UT (#227055-59)
Comet 17P/Holmes - explosive eruption (2007) Frames taking on Oct 25th, 29th 30th showing rapidly expanding coma  2007-10-25 (2.1 arc min diam)  2007-10-29 (7.0 arc min diam) 2007-10-30 (9.3 arc min diam)
Animated CCD Images 5 x 10s exposure (average combine), 2x2 binning, C Filter,  Log Scale Frame 1 : 2007-10-25 20:45h UT (#227055-59) Frame 2 : 2007-10-29 04:43h UT (#228038-42) Frame 3 : 2007-10-30 04:47h UT (#229035-39)
Comet 17P/Holmes - Montage of Images -  2007-10-25 to 2007-11-16
CCD Image Montage (30% size) Images from 2007-10-25 to 2007-11-16 2x2 binning, various exposures [Larger Image,  50% size]

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