(meteorobs) All-sky survey images needed for photometry

[chrismlt at laposte.net]

Dear all,

It has been some time since I have not sent a message to the list, but I continue to read it regularly.

In fact, this message will be off-topic, and I hope you will forgive me .

I'm seeking for images of type " all-sky survey" captured between October 15 and December 20 of last year ( 2014).

Some sky-surveillance images for shooting stars would undoubtedly be of great help .

An observing campaign of the double star Alf Com was launched by the AAVSO a few weeks ago. This star is supposed to present eclipses every 25.8 years. Initially, it was determined that the eclipse was to occur on 25 January 2015. It is now foreseen that this eclipse may have occurred « sometimes » during last fall, most probably in november.

Can you check if you have these archived images for the period from October 15, when the star appeared in the sky at dawn just before sunrise, to December 20 , date from which we have a good photometric monitoring of the star.

In ordinary times, Alf Com shines at 4.32 Vmag, so any image with a sensitivity in the range of mag 4.5 or better should be great.

If you have such archived images, it would be very nice to let me know, or to tell me how I can access them. I would, of course, do all the process to ckeck for the star and make all the needed photometry.

Anyway, if you know where I can locate this sort of images, it would be of great help too, as all images will be useful.

If we do not find this eclipse on archived images right now, we will need to wait until the year 2041.

The current photometry for Alf Com can be found here :

https://millimagjournal.wordpress.com/alpha-comae-berenices-eclipse-2014-2015-observations/


Many thanks in advance.


Christophe



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