gfxgfxwww.arksky.orggfxgfx
gfx gfx
gfx


Click here to visit The Arkansas Sky Observatory website
Welcome, %1$s. Please login or register.

gfx
gfx
*USER INFO
gfxgfx
gfxgfx gfxgfx
:    
gfxgfx    gfxgfx
gfx gfx
gfx
+  www.arksky.org
|-+  ALERTS and Important Notices!!
| |-+  Astro News & Events
| | |-+  STUDIES OF THE CORE of 17P Holmes
« previous next »
: [1]
: STUDIES OF THE CORE of 17P Holmes  ( 8571 )
drclay
Administrator
1000+ Club
*******
: 1167



« : November 05, 2007, 04:55:35 PM »

Interesting aspect of the core of this comet; the scanning densitometer gradient (right) extends a full 208 arc seconds in P.A. 216, the same as the developing straight tail or ejection from the central nucleus of 17P Holmes.  Note that the densitometry reveals that the core has a uniform gradient, but that the gradient is centered on what "was" the bright ejection mass that was some 65" arc from the nucleus on Nov. 3.

This monochrome image is 2 seconds to show the features within the core only, taken with the 0.4m SCT at H45 Petit Jean Mountain South of Arkansas Sky Observatory, by P. Clay Sherrod.
The nucleus on Nov. 5 at 04:40 UT was magnitude 12.4, the total size of the coma (not seen to its entire extent in this image) was 838 arc seconds, with the developing tail in position angle 216 deg.

Dr. Clay
-------------

Arkansas Sky Observatories
Harvard MPC/ H43 (Conway)
Harvard MPC/ H41 (Petit Jean Mountain)
Harvard MPC/ H45 (Petit Jean Mtn. South)
http://www.arksky.org/

[attachment deleted by admin]

Dr. Clay
drclay@tcworks.net
ASO Petit Jean Mountain /MPC H41
ASO Petit Jean Mountain South /MPC H45
ASO West Conway /MPC H43
.......serving astronomy since 1971
dgs
New Member
*
: 1


« #1 : November 05, 2007, 05:58:05 PM »

Hello Clay,

Are we seeing a broken up line of cometisimals as we saw in the HST image of the break up of 73P?
Here's an image taken within a few hours of yours, which has been unsharp masked. Image details: W.O 110mm Megrez
and SXVF-M9 CCD 10mins R:G:B. taken 20:43h UT 2007-11-04. Thanks for all your daily informative posts!

David


[attachment deleted by admin]
drclay
Administrator
1000+ Club
*******
: 1167



« #2 : November 05, 2007, 07:58:10 PM »

Excellent image and beautiful processing....thanks for posting.
I do not believe that we are seeing fragmentation of the primary comet body, but rather a shell or "strata" of outer material that is suddenly being exposed for the first time to the solar energy....interesting that this has happened to this comet before and I am now believing that we have a cometary body that is nearly spherical and composed of many layers, perhaps not unlike the composition of an "M & M" except with many more layers of materials.  We know that this has happened now at least three times, this one being the most spectacular of all with this comet.

Keep up the great work and posting....

Dr. Clay

Dr. Clay
drclay@tcworks.net
ASO Petit Jean Mountain /MPC H41
ASO Petit Jean Mountain South /MPC H45
ASO West Conway /MPC H43
.......serving astronomy since 1971
: [1]  
« previous next »
:  

Powered by MySQL Powered by PHP SMF 2.0.11 | SMF © 2015, Simple Machines
Cerberus design by Bloc
Valid XHTML 1.0! Valid CSS!
gfx
gfxgfx gfxgfx