[vsnet-chat 3059] (fwd) Re: (fwd) ?Cataclysmic Star in CMa 1917 (Greaves)

[Taichi Kato <tkato>]

(fwd) Re: (fwd) ?Cataclysmic Star in CMa 1917 (Greaves)

Date: Sun, 11 Jun 2000 20:38:38 +0000
From: JG <jgts@jgws.totalserve.co.uk>
Subject: Re: (fwd) ?Cataclysmic Star in CMa 1917 (Greaves)

Brian Skiff wrote:

>      For cases such as this you might want to use the USNO-Flagstaff pixel-
> server, which delivers _all_ available plate scans at higher quality than
> others.  Takes 10-20 minutes for it to retrieve the data, so be sure to
> supply your e-mail address in the place provided.
>
> http://vsnet.nofs.navy.mil/data/FchPix/cfra.html
>
> \Brian
>
Thanks Brian...

...actually, nothing appeared at the appropriate position in POSS, SERC,
AAO or ESO plates from that server, either for blue or red, with dates
of 1955, 1979, 1985 and 1995.

Funnily enough, the MAMA/ESO R image was far more "contrasty", or at
least with "less noisy" background than the ESO R image from the USNO
server, so if these are from the same plates, the Paris MAMA system
seems better for ESO R than the USNO one, as it was easy enough to glean
a possible star from the MAMA one, wherease USNO's gave noisier
backgrounds.

However, I have absolutely no idea as to how the mechanisms/algorithms
for either system are utilised, so don't know why this difference
occurs.

Of course, this only matters to southerners :-)

[NB I've not been able to find out about UCAC-1 yet].

Cheers

John

John Greaves
UK

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