addskycoords
Usage:
addskycoords [-epoch <expr>] [-inunit deg|rad|sex] [-outunit deg|rad|sex] <insys> <outsys> <col-id1> <col-id2> <col-name1> <col-name2>
Add new columns to the table representing position on the sky.
The values are determined by converting a sky position
whose coordinates are contained in existing columns.
The <col-id>
arguments give identifiers for
the two input coordinate columns
in the coordinate system named by
<insys>
, and
the <col-name>
arguments name
the two new columns,
which will be in the coordinate system named by
<outsys>
.
The <insys>
and <outsys>
coordinate system specifiers are one of
icrs
: ICRS (Right Ascension, Declination)fk5
: FK5 J2000.0 (Right Ascension, Declination)fk4
: FK4 B1950.0 (Right Ascension, Declination)galactic
: IAU 1958 Galactic (Longitude, Latitude)supergalactic
: de Vaucouleurs Supergalactic (Longitude, Latitude)ecliptic
: Ecliptic (Longitude, Latitude)The -inunit
and -outunit
flags
may be used to indicate the units of the existing coordinates
and the units for the new coordinates respectively;
use one of
degrees
, radians
or
sexagesimal
(may be abbreviated),
otherwise degrees will be assumed.
For sexagesimal, the two corresponding columns must be
string-valued in forms like hh:mm:ss.s and dd:mm:ss.s
respectively.
For certain conversions, the value specified by the
-epoch
flag is of significance.
Where significant its value defaults to 2000.0.
Syntax for the <expr>
, <col-id1>
and <col-id2>
arguments is described in the manual.