## Institut für Astronomie und Astrophysik## Abteilung AstronomieSand 1, D-72076 Tübingen, Germany |

The subdirectory `astro`
includes about 50 mostly self-contained astronomy utilities.

The procedure `UVBYBETA` uses the non-standard system
variable `!TEXTOUT`. The procedure `ASTROLIB` can be
used to add this system variable to one's session.

The procedure WCS_DEMO demonstrates the world coordinate system (WCS)
transformation procedures `WCSSPH2XY` and `WCSXY2SPH`.
Information on the
proposed WCS standards is available from
http://fits.cv.nrao.edu/documents/wcs/wcs.html.
`WCS_DEMO` requires use of the
`SPHDIST()` function in the `/jhuapl` directory.

Additional time conversion procedures such as those to convert between
Julian date and International Atomic Time (TAI) are located in
http://sohowww.nascom.nasa.gov/solarsoft/gen/idl/time.

A_b | Compute B band interstellar extinction according to the RC2. |

ADSTRING | Return RA and Dec as character string(s) in sexigesimal format. |

AIRTOVAC | Convert air wavelengths to vacuum wavelengths |

AITOFF | Convert longitude, latitude to X,Y using an AITOFF projection. |

AITOFF_GRID | Produce an overlay of latitude and longitude lines over a plot or image |

ARCBAR | Draw an arc bar on an image showing the astronomical plate scale |

ARROWS | To display "weathervane" directional arrows on an astronomical image |

ASTDISP | Print astronomical and pixel coordinates in a standard format |

ASTRO | Interactive utility for precession and coordinate conversion. |

BARYVEL | Calculates heliocentric and barycentric velocity components of Earth. |

BPRECESS | Precess positions from J2000.0 (FK5) to B1950.0 (FK4) |

CALZ_UNRED | Deredden a galaxy spectrum using the Calzetti et al. (2000) recipe |

CCM_UNRED | Deredden a flux vector using the CCM 1989 parameterization |

CO_ABERRATION | Calculate changes to Ra and Dec due to "the effect of aberration", |

CO_NUTATE | Calculate changes in RA and Dec due to nutation of the Earth's rotation |

CO_REFRACT() | Calculate correction to altitude due to atmospheric refraction. |

COSMO_PARAM | Derive full set of cosmological density parameters from a partial set |

CT2LST | To convert from Local Civil Time to Local Mean Sidereal Time. |

DATE | Convert day-of-year to a DD-MMM-YYYY string |

DATE_CONV | Procedure to perform conversion of dates to one of three possible formats. |

DAYCNV | Converts Julian dates to Gregorian calendar dates |

DEREDD | Deredden stellar Stromgren parameters given for a value of E(b-y) |

ECI2GEO | Convert Earth-centered inertial coordinates to geographic spherical coords |

EQ2HOR | Convert celestial (ra-dec) coords to local horizon coords (alt-az). |

EQPOLE | Convert RA and Dec to X,Y using an equal-area polar projection. |

EQPOLE_GRID | Produce an equal area polar projection grid overlay |

EULER | Transform between Galactic, celestial, and ecliptic coordinates. |

FLUX2MAG | Convert from flux (ergs/s/cm^2/A) to magnitudes. |

FM_UNRED | Deredden a flux vector using the Fitzpatrick (1999) parameterization |

GAL_FLAT | Transforms the image of a galaxy so that the galaxy appears face-on |

GAL_UVW | Calculate the Galactic space velocity (U,V,W) of star |

GALAGE | Determine the age of a galaxy given its redshift and a formation redshift. |

GCIRC | Computes rigorous great circle arc distances. |

GEO2ECI | Convert geographic spherical coordinates to Earth-centered inertial coords |

GEO2GEODETIC | Convert from geographic/planetographic to geodetic coordinates |

GEO2MAG() | Convert from geographic to geomagnetic coordinates |

GEODETIC2GEO | Convert from geodetic (or planetodetic) to geographic coordinates |

GET_COORDS | Converts a string with angular coordinates to floating point values. |

GET_DATE | Return the (current) UTC date in CCYY-MM-DD format for FITS headers |

GET_JULDATE | Return the current Julian Date |

GLACTC | Convert between celestial and Galactic (or Supergalactic) coordinates. |

HADEC2ALTAZ | Converts Hour Angle and Declination to Horizon (alt-az) coordinates. |

HELIO | Compute (low-precision) heliocentric coordinates for the planets. |

HELIO_JD | Convert geocentric (reduced) Julian date to heliocentric Julian date |

HELIO_RV | Return the heliocentric radial velocity of a spectroscopic binary |

HOR2EQ | Converts local horizon coords (alt-az) of something to equatorial (ra-dec). |

IMCONTOUR | Make a contour plot labeled with astronomical coordinates. |

IMF | Compute an N-component power-law logarithmic initial mass function |

ISMEUV | Compute the continuum interstellar EUV optical depth |

JDCNV | Converts Gregorian dates to Julian days |

JPLEPHINTERP | Interpolate position and motion of planetary bodies (JPL Ephemeris) |

JPLEPHREAD | Open and read JPL DE200 or DE405 Ephemeride FITS File |

JPLEPHTEST | Test JPLEPHTEST with JPL test data set |

JPRECESS | Precess astronomical coordinates from B1950 to J2000 |

JULDATE | Convert from calendar to Reduced Julian Date |

LSF_ROTATE: | Create a 1-d convolution kernel to broaden a spectrum from a rotating star |

LUMDIST | Calculate luminosity distance (in Mpc) of an object given its redshift |

MAG2FLUX | Convert from magnitudes to flux (ergs/s/cm^2/A). |

MAG2GEO() | Convert from geomagnetic to geographic coordinates |

MONTH_CNV | Convert between a month name and the equivalent number EXPLANATION: (e.g., For example, converts from 'January' to 1 or vice-versa. |

MOONPOS | To compute the RA and Dec of the Moon at specified Julian date(s). |

MPHASE | Return the illuminated fraction of the Moon at given Julian date(s) |

NUTATE | Return the nutation in longitude and obliquity for a given Julian date |

OBSERVATORY | Return longitude, latitude, altitude & time zones of an observatory |

PLANCK() | To calculate the Planck function in units of ergs/cm2/s/A |

PLANET_COORDS | Find low or high precision RA and DEC for the planets given a date |

POSANG | Computes rigorous position angle of source 2 relative to source 1 |

PRECESS | Precess coordinates from EQUINOX1 to EQUINOX2. |

PRECESS_CD | Precess the CD (coordinate description) matrix from a FITS header |

PRECESS_XYZ | Precess equatorial geocentric rectangular coordinates. |

PREMAT | Return the precession matrix needed to go from EQUINOX1 to EQUINOX2. |

QDCB_GRID | Produce an overlay of latitude and longitude lines over a plot or image |

RADEC | To convert RA and Dec from decimal to sexigesimal units. |

SIXTY() | Converts a decimal number to sexigesimal. |

SUNPOS | To compute the RA and Dec of the Sun at a given date. |

TDB2TDT | Relativistic clock corrections due to Earth motion in solar system |

TEN() | Converts a sexigesimal number to decimal. |

TENV() | Converts sexigesimal number or vector to decimal. |

TIC_ONE | Determine the position of the first tic mark for astronomical images. |

TICLABELS | Create tic labels for labeling astronomical images. |

TICPOS | Specify distance between tic marks for astronomical coordinate overlays |

TICS | Compute a nice increment between tic marks for astronomical images. |

UVBYBETA | Derive dereddened colors, metallicity, and Teff from Stromgren colors. |

VACTOAIR | Convert vacuum wavelengths to air wavelengths |

XYZ | Calculate geocentric X,Y, and Z and velocity coordinates of the Sun |

YDN2MD | Convert from year and day number of year to month and day of month. |

ZANG | Determine the angular size of an object as a function of redshift |

ZENPOS | Return the zenith RA and Dec in radians for a given Julian date. |

Last modified by pro2html on 2008 November 09 at 04:11 UTC

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Jörn Wilms (wilms@astro.uni-tuebingen.de)

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