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

 Previous Imaging Session
Images
(S549)		   Home
Images
Sessions 		  Home
Home
Page		   Next Imaging Session
Images
 (S551) 		 
Objects Session Notes
Bullet C/2012 X1 (LINEAR) - Comet
 
Bullet Variable Stars
Bullet Photometric Monitoring - Variables
- None
Bullet Astrometric Monitoring - Nearby Stars
- 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 degC minimum
- CCD operation -25 degC (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)

Image
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 

Image

 Image
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

  
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

Image

 Image
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)
Image
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
Image 

CCD Image Montage (30% size)
Images from 2007-10-25 to 2007-11-16
2x2 binning, various exposures
[Larger Image,  50% size]

Back to Top

Variable Stars

Back to Top

This Web Page: CCD Images - Session 550 (2013-10-23)
Last Updated : 2015-05-16
Site Owner : David Richards
Home Page : David's Astronomy Web Site