Meade field derotator

Here is the place to talk about all those equipment(Telescope, Mounts, Eyepieces, etc...) you have. Not sure which scope/eyepiece is best for you? Trash it out here!
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Airconvent
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Post by Airconvent »

JY wrote:Yes, NABG can create problems with bright stars.
You then have to take shorter exposure images and stack them or use a "deblooming" tool which is a paint brush tool ... only for cosmetics.

A few 16 and 17 mag supernovae imaged from Yo Chu Kang last year : http://www.geocities.com/jybeninger/supernova.html
cool man! you imaged supernovae in Singapore??
wow! again the same question. Can you see them visually?
I think they only shine very bright for around 2-3 days and then progressively dim down over the following weeks...so you must have caught a few "new" ones?

rich
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JY
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Post by JY »

I cannot see them visually, only visible on CCD.
To check the latest supernovae : http://www.rochesterastronomy.org/snimages/

Jean-Yves
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Post by tanguan2001 »

It's a very rewarding pursuit - a chance to do something a bit more science with imaging equipment. I caught supernova 2003cg at about maxima last year (with my SAC7) and followed it for more than a month as it faded to below mag 15+. See images on the link

http://www.angelfire.com/space2/tgtan/NGC3169.htm

I submitted the images to a site that catalogs them and they have become a record of the (at the time) brightest supernova of 2003.

TG
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Post by shoelevy »

hey jy, regarding the ccd camera you're using, is it cooled?
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Post by JY »

TG : Very good one ! Keep on imaging these SNs, you may want to try some variable stars as well !

Shoelevy : The ST8 is cooled electronically, I image with the CCD at 0 deg C.

Jean-Yves
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Post by shoelevy »

according to TG, the cooling causes condensation on the camera which he thinks is a problem
did you face this problem?
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JY
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Post by JY »

I had a frosting problem once ... one of the "n" problems encountered along the way.
It happened as there was too much humidity in the CCD cell ( the CCD is in a sealed section of the camera with a dessicant plug.)
I followed the manual procedure and regenerated the dessicant.
No problems ever since.

TG is using a SAC 7 and if I have it right, the CCD in that camera is not sealed in an enclosed section, thus the condensation problem.

Cheers

Jean-Yves
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shoelevy
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Post by shoelevy »

oh...so you're saying your ST8 has a dehumidifier which removes humidity in the vicinity of the ccd chip so that condensation is not a problem on the chip right?
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Post by JY »

Correct
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