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<H1><A NAME="SECTION001200000000000000000"></A><A NAME="ap:format"></A>
<BR>
Native Star Files
</H1>
<P>
The file format used by <SMALL>GCX </SMALL>for star catalogs, recipies and
observation reports consists of lists of token-value pairs.
Each list is enclosed in brackets. The value part of each
pair can be a number, a string (enclosed in double quotes) or
another list. The order of the pairs within the list is not important.
<P>
A file can contain several top-level lists. Each such list is called
a ``frame''. A typical recipe frame looks like:
<PRE>
( recipe ( object "aucyg" ra "20:18:32.76" dec "34:23:21.3"
equinox 2000 comments "generated from tycho2" )
sequence "tycho2"
stars (
(name "2680-1551" type std mag 7.48
ra "20:17:54.500" dec "34:05:25.22" perr 0.0071
comments "p=T "
smags "v=7.344/0.020 b=8.654/0.020 vt=7.483/0.011 bt=9.024/0.017"
flags ( astrom ) )
(name "2680-1588" type std mag 7.79
ra "20:16:56.755" dec "34:08:22.86" perr 0.0057
comments "p=T "
smags "v=7.795/0.020 b=7.745/0.020 vt=7.790/0.011 bt=7.731/0.015"
flags ( astrom ) )
(name "aucyg" type target mag 9.5
ra "20:18:32.76" dec "34:23:21.3"
comments "p=V t=M s=M6e-M7e m(p)=9.50/15.30"
flags ( var ) ) )
)
</PRE>
An observation report frame can look like:
<PRE>
( observation ( filter "b" object "aucyg" ra "20:18:39.31"
dec "34:23:05.6" equinox 2000 mjd 53236.9839856
telescope "SCT" aperture 30 exptime 20 sns_temp 238.3
latitude "44:25:50.0" longitude "-26:06:50.0"
altitude 75 airmass 1.223 observer "R. Corlan" )
noise ( read 7 eladu 2 flat 0 )
ap_par ( r1 5 r2 9 r3 13 sky_method "synthetic_mode" )
(name "AU_CYG_39" type std mag 12.1
ra "20:17:47.15" dec "34:32:01.4"
smags "v=12.062/-0.001 b-v=1.982/-0.002 b=14.044/0.002"
imags "b=-7.256/0.167"
residual -0.209 stderr 1.25
noise (photon 0.13 sky 0.074 read 0.075 scint 0.0021)
centroid (x 876.89 y 385.24 xerr 0.0085 yerr 0.0065 dx -0.18 dy -0.15)
flags ( astrom centered ) )
(name "AU_CYG_10" type std mag 13
ra "20:17:44.52" dec "34:21:00.0"
smags "v=12.961/-0.001 b-v=0.765/-0.001 b=13.726/0.001"
imags "b=-7.991/0.089"
residual 0.208 stderr 2.33
noise (photon 0.066 sky 0.038 read 0.038 scint 0.0021)
centroid (x 569.61 y 331.56 xerr 0.002 yerr 0.0017 dx 0.19 dy -0.17)
flags ( astrom centered ) )
(name "aucyg" type target mag 9.5
ra "20:18:32.76" dec "34:23:21.3"
comments "p=V t=M s=M6e-M7e m(p)=9.50/15.30"
smags "b=12.642/0.085"
imags "b=-8.867/0.042"
centroid (x 782.90 y 615.40 xerr 0.0079 yerr 0.0064 dx 0.17 dy 0.07)
noise (photon 0.031 sky 0.017 read 0.017 scint 0.0021)
flags ( var centered ) ) )
transform ( band "b" zp 21.509 zperr 0.074 zpme1 1.29 ) )
</PRE>
A typical catalog frame would be:
<PRE>
( catalog (comments "Internal catalog output")
stars (
( name "piuma" type catalog ra "08:39:11.70" dec "65:01:15.0"
flags ( var ) )
( name "lpup" type catalog ra "07:13:31.90" dec "-44:38:39.0"
flags ( var ) )
( name "piori" type catalog ra "04:54:15.10" dec "02:26:26.4"
flags ( var ) ) ) )
</PRE>
<P>
All three forms of the star file have in common the top-level token <TT> stars</TT> which is followed by the list of all stars within the frame.
Each star is also represented by a list, having some of the following
tokens:
<TABLE CELLPADDING=3>
<TR><TD ALIGN="LEFT">name</TD>
<TD ALIGN="LEFT">string</TD>
<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=227>The name of the star;</TD>
</TR>
<TR><TD ALIGN="LEFT">type</TD>
<TD ALIGN="LEFT">symbol</TD>
<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=227>The type of the star: <TT>std</TT> for standards,
<TT>target</TT> for targets, <TT>catalog</TT> far catalog objects and
<TT>field</TT> for field stars;</TD>
</TR>
<TR><TD ALIGN="LEFT">ra</TD>
<TD ALIGN="LEFT">string</TD>
<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=227>Right ascension in HMS format;</TD>
</TR>
<TR><TD ALIGN="LEFT">dec</TD>
<TD ALIGN="LEFT">string</TD>
<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=227>Declination in DMS format;</TD>
</TR>
<TR><TD ALIGN="LEFT">perr</TD>
<TD ALIGN="LEFT">number</TD>
<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=227>Position error in arc seconds;</TD>
</TR>
<TR><TD ALIGN="LEFT">equinox</TD>
<TD ALIGN="LEFT">number</TD>
<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=227>Equinox of coordinates;</TD>
</TR>
<TR><TD ALIGN="LEFT">mag</TD>
<TD ALIGN="LEFT">number</TD>
<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=227>Generic magnitude of the star, used for display
purposes only;</TD>
</TR>
<TR><TD ALIGN="LEFT">smags</TD>
<TD ALIGN="LEFT">string</TD>
<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=227>A string describing the standard magnitudes of the star
and their errors. See Section <A HREF="node8.html#sec:recipe">7.7</A> for the format;</TD>
</TR>
<TR><TD ALIGN="LEFT">imags</TD>
<TD ALIGN="LEFT">string</TD>
<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=227>A string describing the instrumental magnitudes of the star
and their errors;</TD>
</TR>
<TR><TD ALIGN="LEFT">centroid</TD>
<TD ALIGN="LEFT">list</TD>
<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=227>A list containing positional information. <TT>x</TT> and
<TT>y</TT> are frame coordinates of the star's centroid. <TT>xerr</TT> amd
<TT>yerr</TT> are the estimated position errors calculated by the
centroiding code. <TT>dx</TT> and <TT>dy</TT> are the amounts by which the
star's centroid is shifted from the catalog position;</TD>
</TR>
<TR><TD ALIGN="LEFT">noise</TD>
<TD ALIGN="LEFT">list</TD>
<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=227>A list of components of the star's instrumental noise
model;</TD>
</TR>
<TR><TD ALIGN="LEFT">residual</TD>
<TD ALIGN="LEFT">number</TD>
<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=227>The residual of the star after the zeropoint fit;</TD>
</TR>
<TR><TD ALIGN="LEFT">stderr</TD>
<TD ALIGN="LEFT">number</TD>
<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=227>The standard error (scaled residual) of the star after the zeropoint fit;</TD>
</TR>
<TR><TD ALIGN="LEFT">flags</TD>
<TD ALIGN="LEFT">list</TD>
<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=227>A list of reduction flags.</TD>
</TR>
</TABLE>
<P>
Some top-level tokens of the star files are:
<TABLE CELLPADDING=3>
<TR><TD ALIGN="LEFT">stars</TD>
<TD ALIGN="LEFT">list</TD>
<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=227>List of stars in the frame;</TD>
</TR>
<TR><TD ALIGN="LEFT">recipe</TD>
<TD ALIGN="LEFT">list</TD>
<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=227>A list of recipe parameters. Most important are the target
object and field center coordinates;</TD>
</TR>
<TR><TD ALIGN="LEFT">observation</TD>
<TD ALIGN="LEFT">list</TD>
<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=227>Parameters of the ccd frame from which the data was
obtained. See Section <A HREF="node8.html#sec:annotations">7.5</A> for more details;</TD>
</TR>
<TR><TD ALIGN="LEFT">catalog</TD>
<TD ALIGN="LEFT">list</TD>
<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=227>Identifies the frame as a catalog frame. The most
important token in this list is <TT>comments</TT>;</TD>
</TR>
<TR><TD ALIGN="LEFT">sequence</TD>
<TD ALIGN="LEFT">string</TD>
<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=227>The source of the standard magnitudes in the star
list;</TD>
</TR>
<TR><TD ALIGN="LEFT">noise</TD>
<TD ALIGN="LEFT">list</TD>
<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=227>A list of parameters of the CCD noise model used to
calculate instrumental errors;</TD>
</TR>
<TR><TD ALIGN="LEFT">ap_par</TD>
<TD ALIGN="LEFT">list</TD>
<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=227>Parameters used by the aperture photometry routine
(aperture sizes and sky estimation method);</TD>
</TR>
<TR><TD ALIGN="LEFT">transform</TD>
<TD ALIGN="LEFT">list</TD>
<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=227>transformation coefficients, zeropoint and
extinction coefficients used to calculate the standard magnitudes of
target stars.</TD>
</TR>
</TABLE>
<P>
The native star format can be converted to a tabular format using the
report converter function as described in Appendix <A HREF="node14.html#ap:repconv">E</A>.
<P>
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