73P B Split Nucleus Movie April 23


Apr 26, 2006

 


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#14916 Apr 26, 2006

I measured a centroid-to-centroid spacing of the two nuclei of 16 +/-

2 arc seconds in my latest images. For the first time ever I was

able to guide on the head and take 6-minute subframes. The relative

motion was 2.5 arc seconds per minute so guiding really helped me

obtain a good SNR.



In past attempts the autoguider would latch onto a star in the

comet's path and get lost. On my 23 April 0330 UT imaging session

there were no stars brighter than magnitude 16 in the comet's path.

That seldom occurs.



Images and supporting data at

home.att.net/~dpersyk/new.htm



Thank you for visiting my site.



Clear skies,



Dennis Persyk

Igloo Observatory Home Page dpersyk.home.att.net

Hampshire, IL



----------------------------

#14920 Apr 26, 2006

Nice image Dennis. The second node is actually 2 nodes. Check it out

here:



www.eso.org/outreach/press-rel/pr-2006/images/phot-15c-06-normal.jpg



Ajai



-----Original Message-----

From: ap-gto@yahoogroups.com [mailto:ap-gto@yahoogroups.com] On Behalf Of

Dennis Persyk

Sent: Wednesday, April 26, 2006 10:45 AM

To: ap-gto@yahoogroups.com

Subject: [ap-gto] 73P B Split Nucleus



I measured a centroid-to-centroid spacing of the two nuclei of 16 +/-

2 arc seconds in my latest images. For the first time ever I was

able to guide on the head and take 6-minute subframes. The relative

motion was 2.5 arc seconds per minute so guiding really helped me

obtain a good SNR.



In past attempts the autoguider would latch onto a star in the

comet's path and get lost. On my 23 April 0330 UT imaging session

there were no stars brighter than magnitude 16 in the comet's path.

That seldom occurs.



Images and supporting data at

home.att.net/~dpersyk/new.htm



Thank you for visiting my site.



Clear skies,



Dennis Persyk

Igloo Observatory Home Page dpersyk.home.att.net

Hampshire, IL



















To UNSUBSCRIBE, or for general information on the ap-gto list

see groups.yahoo.com/group/ap-gto

Yahoo! Groups Links



----------------------------

#14921 Apr 26, 2006

In a message dated 4/26/2006 12:49:13 PM Central Daylight Time,

dpersyk@... writes:



> Images and supporting data at

> home.att.net/~dpersyk/new.htm

>



Really nice work!



Rolando





[Non-text portions of this message have been removed]



----------------------------

#14926 Apr 26, 2006

Hi,



I also took images from Hamburg, in which you can easily separate the

two parts.

I used the AP 160 with a STL 6303.



web.mac.com/poschinger/iWeb/Web-Site/Letzte%20Aufnahmen%20aus%

20Murnau.html



Konstantin v. Poschinger

Hammerichstr. 5

22605 Hamburg

www.astro22605.de/

homepage.mac.com/poschinger/Menu5.html

web.mac.com/poschinger/iWeb/Web-Site/H-Alpha%20in%20Hamburg.html





Am 26.04.2006 um 19:45 schrieb Dennis Persyk:

> I measured a centroid-to-centroid spacing of the two nuclei of 16 +/-

> 2 arc seconds in my latest images. For the first time ever I was

> able to guide on the head and take 6-minute subframes. The relative

> motion was 2.5 arc seconds per minute so guiding really helped me

> obtain a good SNR.

>

> In past attempts the autoguider would latch onto a star in the

> comet's path and get lost. On my 23 April 0330 UT imaging session

> there were no stars brighter than magnitude 16 in the comet's path.

> That seldom occurs.

>

> Images and supporting data at

> home.att.net/~dpersyk/new.htm

>

> Thank you for visiting my site.

>

> Clear skies,

>

> Dennis Persyk

> Igloo Observatory Home Page dpersyk.home.att.net

> Hampshire, IL

>

>

>

>

>

>

>

>

>

> To UNSUBSCRIBE, or for general information on the ap-gto list

> see groups.yahoo.com/group/ap-gto

> Yahoo! Groups Links

>

>

>

>

>

>

>



----------------------------

#14998 May 3, 2006

I've added a short movie to my web page illustrating the rapid

motion of 73P-B against the fixed star field. It comprises 7 six-

minute frames during which time the comet moves 1.8 arc minutes.



Tips for comet movies:

1) Crop around comet to keep file size small

2) Align on stars, not comet, for smooth viewing

3) Use minimum bit depth and lots of compression to keep file size

small

4) Throw out frames that do not follow a smooth comet motion



I emphasize small file size because of late I've seen comet movies

of 10-20 MB file size that would look just as good at 100 kB and

would attract more viewers.



Note: Mine is a dial-up-friendly movie. It is only 68 kB.



Movie and supporting data at

home.att.net/~dpersyk/new.htm



Thank you for visiting my site.



Clear skies,



Dennis Persyk

Igloo Observatory Home Page dpersyk.home.att.net

Hampshire, IL







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