RDLAND

Name

rdland

Purpose (one Line)

Read the Landolt Standards data file.

Description

This program automates the process of reading the Landolt 1983 Standard
file as provided on the CD-ROM from NSSDC. Selected Astronomical
Catalogs, Volume 1. Also supported is the table for the 1992 catalog
as supplied by Arlo Landolt at Louisiana State University.

File I/o

Calling Sequence

rdland,catalog,id,ra,dec,mags,colors,errs,cerrs

Inputs

catalog - Integer key for the catalog to read in. The only valid
inputs are:
83 - for the 1983 catalog.
92 - for the 1992 catalog.

Optional Input Parameters

Keyword Input Parameters

EPOCH - JD of epoch for of-date precession.
Default = catalog epoch (1985.0 for 83 catalog or
2000.0 for 92 catalog).
FILE - Name of star catalog file to read. Defaults are:
For 83 = '/net/frakir/raid/buie/photometry/landolt/landolt.dat'
For 92 = '/net/frakir/raid/buie/photometry/landolt/landolt92.dat'
Only one of the following is allowed to be set. If none are set,
the coordinates will be returned in the equinox of the catalog.
B1950 - Coordinates should be referred to equinox of B1950.
J2000 - Coordinates should be referred to equinox of J2000.
OFDATE - Coordinates should be referred to equinox of date.
If selected, EPOCH must be provided.

Outputs

id - Name of the stars.
ra - Right Ascension in radians. Catalog epoch, unless one of the
other choices, via keyword, is specified.
dec - Declination in radians. Catalog epoch, unless one of the
other choices, via keyword, is specified.
mags - Stellar magnitudes, UBVRI
colors - Stellar colors, U-B, B-V, V-R, R-I, V-I
merrs - Uncertainties on the magnitudes.
cerrs - Uncertainties on the colors.
nobs - Number of observations
nnig - Number of nights of observations

Common Blocks

None.

Side Effects

Restrictions

This procedure is hard-coded for these particular files. It is not
intended to be a general file reading program.
If file is not specified, the filename defaults are:
/net/frakir/raid/buie/photometry/landolt/landolt.dat (for 83 catalog)
/net/frakir/raid/buie/photometry/landolt/landolt92.dat (for 92 catalog)

Procedure

Modification History

93/01/19, Written by Marc W. Buie, Lowell Observatory
93/10/01, Modifications by Doug Loucks, Lowell Observatory. The
1992 Landolt Catalog (Epoch 2000) is now supported. A new
parameter allows selection of the the 1983 or the 1992 catalog.
96/11/20, MWB, now returns number of nights and number of observations.
2004/02/09, MWB, changed default path to catalog