Re: Visibility of SDF with ISSAC (and FORS)

From: clidman@eso.org
Date: Thu May 09 2002 - 02:45:34 PDT

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    Dear Saul,
       Probably not. Unless the seeing is superb, we will not get the necessary image quality we
    require to go deep enough. This is especially applicable to ISAAC observations
    where we need an image quality of 0.5" or better for the project to be feasible.

    Cheers, Chris.

    Saul Perlmutter wrote:

    > I just checked skycalc to see if we could manage to get the SDF field
    > from the VLT. Here's what I got for tonight.
    >
    > Chris, do you think that we could get usable data for the 2 or 3 hours
    > each night that the airmass is below 1.7 or 1.8?
    >
    >
    >
    > http://www.imagiware.com/astro/airmass.cgi?observatory=Other-paranal&obslong=&obslat=&actual=&effective=&site=&zone=&zonename=&zoneabbrev=&daylight=1&year=2002&month=05&day=8&starname=sdf&rightasc=13+24+21&declin=27+29+23&epoch=2000&altitude=-18&command=display
    >
    > --------------------------------------------------------------------------------------------------------------------------------------
    >
    > Hourly Airmass Table for sdf for May 8, 2002
    >
    > -----------------------------------------------------------------------------------------------------------------------------------------------------
    >
    > *** Hourly airmass for sdf ***
    >
    > Epoch 2000.00: RA 13 24 21.0, dec 27 29 23
    > Epoch 2002.35: RA 13 24 27.6, dec 27 28 39
    >
    > At midnight: UT date 2002 May 9, Moon 0.10 illum, 151 degr from obj
    >
    > Local UT LMST HA secz par.angl. SunAlt MoonAlt
    >
    > 19 00 23 00 9 25 -4 00 4.717 -126.4 -11.9 ...
    > 20 00 0 00 10 25 -3 00 2.637 -136.1 ... ...
    > 21 00 1 00 11 25 -1 59 1.971 -148.3 ... ...
    > 22 00 2 00 12 25 -0 59 1.702 -163.3 ... ...
    > 23 00 3 00 13 25 0 01 1.628 179.7 ... ...
    > 0 00 4 00 14 26 1 01 1.707 162.8 ... ...
    > 1 00 5 00 15 26 2 01 1.985 147.9 ... ...
    > 2 00 6 00 16 26 3 01 2.671 135.8 ... ...
    > 3 00 7 00 17 26 4 02 4.855 126.1 ... ...
    > 4 00 8 00 18 26 5 02 (v.low) 118.4 ... ...
    > 5 00 9 00 19 26 6 02 (down) 111.9 ... 4.7
    > 6 00 10 00 20 27 7 02 (down) 106.4 -15.5 17.8
    > 7 00 11 00 21 27 8 02 (down) 101.3 -2.4 30.6
    >
    >
    >
    > -----------------------------------------------------------------------------------------------------------------------------------------------------
    >
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