Dear Jean-Charles
As it is written in the email, the gain in accuracy is a factor
of two between 2MASS and USNO. I will send this email tomorrow, but
I thin all is ready. If you ha&
> Hi Yannick,
>
> I checked a couple of typos, and added a bit of formating which
> I would include as is on the CFHTLS news section. Yannick, how
> about giving an estimation of gain in accuracy for the new
> astrometry using 2MASS? I understand it varies from field to
> field but on average I remember you gave some figures at the UM.
>
> JJ, is it all fine as is? If so, I then suggest Yannick sends
> it this time to the "cfhtls" alias. I guess you could attach
> a small 1024x768 "screensaver" size chunck of one of the amazing
> JPEG from the Deep 85% as a visual addition? Here, I cropped one
> for you, attached to this email, it is only 1% of one Deep field,
> wao... truly amazing!
>
> Jean-Charles.
>
> ------------------------------------------------------------------------------
> Dear CFHTLS registered users
>
> The Synoptic T0004 Table is now completed and opened to the public
> without restriction. This table provides useful information about the
> release and all quality assessment meta-data built during the production
> of the release.
>
> The T0004 release has important new features as compared to T0003:
>
> - 2 sets of Deep data :
> o 25% best seeing images stack (D25: ugriz with seeing down to 0.60"
> for
> some fields with exp. time up to 15hrs)
> o 85% best seeing images stack : the deepest wide field ever produced
> with a 4-meter telescope (D85: up to 50 hrs in some fields)
>
> - New Wide field: addition of the W4 wide field with 11 deg2 complete
> in ugriz.
>
> - New astrometry: done with 2MASS instead of USNO. It provides more
> accurate and more stable astrometric calibration than T0003 for ALL
> fields (a gain in rms internal and external error position by a factor
> of 2). It also provides a more stable an accurate field-to-field
> photometric calibration.
>
> - Number of stacks:
> o Deep: 40 [20 D25 (4*ugriz) + 20 D85 (4*ugriz)]
> o Wide: 524 (35 u + 133 g + 173 r + 137 i + 46 z)
>
> More information is available through the T0004 summary
>
> http://terapix.iap.fr/rubrique.php?id_rubrique=241
>
> as well as the Synoptic T0004 Table entry page
>
> http://terapix.iap.fr/article.php?id_article=724
>
> CFHT/CADC/Terapix
>
> ps: attached is a 1% section of one of the Deep85 field gri color image.
>
Received on Fri Jul 13 2007 - 11:07:45 HST