Re: M45 and Machholz on 8 January -- the Sky Cleared!!
From: Pete Lawrence (pete.lawrence_nospam__at_pbl33.co.uk)
Date: 01/09/05
- Next message: Davoud: "Re: M45 and Machholz on 8 January -- the Sky Cleared!!"
- Previous message: Michael McCulloch: "Re: M45 and Machholz on 8 January -- the Sky Cleared!!"
- In reply to: Michael McCulloch: "Re: M45 and Machholz on 8 January -- the Sky Cleared!!"
- Next in thread: Michael McCulloch: "Re: M45 and Machholz on 8 January -- the Sky Cleared!!"
- Reply: Michael McCulloch: "Re: M45 and Machholz on 8 January -- the Sky Cleared!!"
- Messages sorted by: [ date ] [ thread ]
Date: Sun, 09 Jan 2005 15:27:21 +0000
On Sun, 09 Jan 2005 10:16:03 -0500, Michael McCulloch
<michaelm@nospam.invalid.net> wrote:
>>Wow - no tail at ISO3200 for 400s! I'm quite surprised by that. What
>>optical arrangements were there on the front of the camera Michael?
>
>I am surprised as well. I'm still playing with my photos from last
>night taken Jan 9th around 4 UT (some 5 hours after your photo), but
>so far none of them show any ion tail in the vicinity of the comet
>head even in inverted grayscale.
>
>Here is the one shot at 3200 ASA for 400s. I only took it to attempt
>to discover the orientation of the ion tail in the frame so I could
>maximize coverage in the fov:
>
>http://gamesforone.com/stars/notail.jpg
>
>There may be barely a hint of something at the 1 o'clock position but
>the brightness and contrast of that image has been pushed to an
>extreme.
>
>My setup is a 105mm apo at f/6.2. The camera was at prime focus.
My guess it that something's happened to turn the tail off Michael. A
number of other posts on other forums from Stateside imagers suggests
no tail either. My shot at 18h42m UT on the 8th,
http://www.digitalsky.org.uk/comets/Machholz/2005-01-08-18h42m.jpg
definitely shows a tail, albeit a faint one - which I've attributed to
the layer of thin cloud I was imaging through.
I wonder if the aurora producing solar activity has had an effect?
-- Pete http://www.digitalsky.org.uk Global Projects - http://www.globalobservers.net
- Next message: Davoud: "Re: M45 and Machholz on 8 January -- the Sky Cleared!!"
- Previous message: Michael McCulloch: "Re: M45 and Machholz on 8 January -- the Sky Cleared!!"
- In reply to: Michael McCulloch: "Re: M45 and Machholz on 8 January -- the Sky Cleared!!"
- Next in thread: Michael McCulloch: "Re: M45 and Machholz on 8 January -- the Sky Cleared!!"
- Reply: Michael McCulloch: "Re: M45 and Machholz on 8 January -- the Sky Cleared!!"
- Messages sorted by: [ date ] [ thread ]
Relevant Pages
|
