(also for sgsc,
sty2,
stmc,
sgsca,
sua1,
sua2,
susa1,
susa2,
ssao,
sppm, and
siras)
As of version 2.8.6, scat can
access another instance of itself across
the World Wide Web.
- ra=right ascension
- Right ascension of center for search in hours:minutes:seconds or
fractional degrees. Galactic or ecliptic longitude is expected to be
in fractional degrees.
- dec=declination
- Declination of center for search in degrees:minutes:seconds or
fractional degrees. Galactic or ecliptic latitude is expected to be
in fractional degrees.
system may be J2000, FK5, B1950, FK4, ecliptic, or galactic.
The year for an alternate equinox may be included with the system,
so J1985 would be FK5 coordinates at the equinox of 1985.0. Fractions
of years are allowed. To indicate the epoch of the coordinates, which
increases accuracy of coordinate conversion between J2000 and B1950,
use the -y command.
- sys=system
-
system may be J2000, FK5, B1950, FK4, ecliptic, or galactic.
The year for an alternate equinox may be included with the system,
so J1985 would be FK5 coordinates at the equinox of 1985.0. Fractions
of years are allowed. To indicate the epoch of the coordinates, which
increases accuracy of coordinate conversion between J2000 and B1950,
use the -y command.
- num=number or range
- A list of numbers of specific catalog numbers to list may be separated
by spaces or commas. Ranges of the format
first-last[xstep]
may be among those numbers. If last is omitted, but the -
is included, ten stars, starting with first are listed. If step
is omitted, it is assumed to be one.
(ranges added in version 2.6)
- closest=y
- List single closest catalog source to command line position
- outsys=system
- Output catalog positions in B1950 (FK4),
J2000 (FK5),
ecliptic, or galactic coordinates no matter what system
the catalog is in.
- catalog=catalog name
- Name of catalog to search (
ua1,
ua2,
gsc,
usa1,
usa2,
ujc,
ppm,
sao,
iras,
or local file name).
Local catalogs may be in
StarBase tab table,
simple ASCII,
TDC binary format
Directories are specified in the source code
which reads each catalog or with environment variables.
Instead of using this argument, the program may be invoked, through a link
or by renaming it, as
sua1,
sua2,
sgsc,
susa1,
susa2,
sujc,
sppm,
ssao, or
siras.
- degrees=yes
- Output RA,Dec positions in fractional degrees instead of sexigesimal.
- mag=faint magnitude limit
- Only stars brighter than faint magnitude limit are listed.
The default is to list all stars.
- min=faint magnitude limit
- Only stars brighter than faint magnitude limit are listed.
The default is to list all stars.
- max=bright magnitude limit
- Only stars fainter than bright magnitude limit are listed.
The default is to list all stars.
- nstar=number
- Print up to this number of brightest (or closest if closest is
yes) catalog stars. If the internal default of 100 is exceeded
by the search, set this number high enough to include all of the stars
which are found.
- equinox=date
- Use this date as the equinox of the output coordinates
- radius=arcseconds or dd:mm:ss.sss
- Half-width of square to search in arcseconds (default is 10).
If negated, search circle of this radius instead of a box.
The radius may be given in degrees as dd:mm:ss.ss instead of arcseconds.
- dra=arcseconds or hh:mm:ss.sss
- Half-width of rectangle to search in arcseconds (default is 10).
It may be given in hours as hh:mm:ss.ss instead of arcseconds.
- ddec=arcseconds or dd:mm:ss.sss
- Half-height of rectangle to search in arcseconds (default is 10).
It may be given in degrees as dd:mm:ss.ss instead of arcseconds.
- sort=magnitude (or mn) or ra or
dec or dist
- Sort output list by magnitude (or specified magnitude),
right ascension, declination, or distance from search center.
The default is to sort by the first magnitude, brightest to faintest.
- class=class
- List only Guide Stars with this class (-1=all, 0=stars, 3=nonstars).
(scat and sgsc only)
- epoch=date
- Use this date as the epoch of the output coordinates. If you expect
B1950 and J2000 conversions to be reversible to better than 0.1 arcsecond,
this must be included. To indicate a specific equinox, include the date
as a fractional year in the coordinate system.
[scat]
[sgsc]
[sua1]
[sua2]
[susa1]
[susa2]
[sact]
[sujc]
[sppm]
[ssao]
[siras]
