Learn R Programming

astrolibR (version 0.1)

Astronomy Users Library

Description

Several dozen low-level utilities and codes from the Interactive Data Language (IDL) Astronomy Users Library (http://idlastro.gsfc.nasa.gov) are implemented in R. They treat: time, coordinate and proper motion transformations; terrestrial precession and nutation, atmospheric refraction and aberration, barycentric corrections, and related effects; utilities for astrometry, photometry, and spectroscopy; and utilities for planetary, stellar, Galactic, and extragalactic science.

Copy Link

Version

Install

install.packages('astrolibR')

Monthly Downloads

21

Version

0.1

License

GPL

Maintainer

Eric Feigelson

Last Published

August 8th, 2014

Functions in astrolibR (0.1)

Calculate polynomial

Distance on a sphere

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

Calculate changes in right ascension and declination due to nutation of the Earth's rotation

Calculate the Planck function in units of ergs/cm2/s/A

Calculate changes to right ascension and declination due to astronomical aberration

Calculates heliocentric and barycentric velocity components of Earth

astrolibR-package

astrolibR: Astronomy Users Library

Calculate correction to altitude due to atmospheric refraction

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

Compute the Right Ascension and Declination of the Moon at specified Julian date(s)

Integrand for cosmic age vs. redshift in standard cosmology

Precess equatorial geocentric rectangular coordinates

Convert vacuum wavelengths to air wavelengths

Convert from year, month, day to day number of year

Converts local horizon coordinates (alt-az) to equatorial coordinates(ra-dec)

Convert Gregorian dates to Julian days

Convert between a month name and the equivalent number

Compute position angle of source 2 relative to source 1

Transform between Galactic, celestial, and ecliptic coordinates

Derive dereddened colors, metallicity, and Teff from Stromgren colors

Precess celestial positions from B1950.0 (FK4) to J2000.0 (FK5) with proper motion

Convert air wavelengths to vacuum wavelengths

Convert Julian dates to Gregorian calendar dates

Derive full set of cosmological density parameters from a partial set

Convert a decimal number to sexigesimal

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

Determine the age of a galaxy given its redshift and a formation redshift

Convert horizon (Alt-Az) coordinates to hour angle and declination

Convert from astronomical magnitudes to flux (ergs/s/cm^2/A)

Convert from geographic/planetographic to geodetic coordinates

Convert from Local Civil Time to Local Mean Sidereal Time

Deredden a flux vector using the Fitzpatrick (1999) parameterization

Convert Hour Angle and Declination to Horizon (alt-az) coordinates

Convert a sexigesimal number or string to decimal

Computes rigorous great circle arc distances between points on the celestial sphere

Convert Right Ascension and declination from decimal to sexigesimal units

Convert from geodetic (or planetodetic) to geographic coordinates

Return the precession matrix needed to go from EQUINOX1 to EQUINOX2

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

Calculate the heliocentric radial velocity of a spectroscopic binary

Convert between celestial and Galactic (or Supergalactic) proper motion and coordinates

Convert Right Ascension and declination to X,Y using an equal-area polar projection

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

Convert geocentric (reduced) Julian date to heliocentric Julian date

Convert Earth-centered inertial coordinates to geographic spherical coordinates

Precess coordinates from EQUINOX1 to EQUINOX2

Force an angle into the range 0 <= ang < 360

Convert geographic spherical coordinates to Earth-centered inertial coordinates

Compute the continuum interstellar extreme ultraviolet (EUV) optical depth

Compute the Right Ascension and Declination of the Sun at specified Julian date(s)

Calculate the separation and position angle of a binary star

Deredden a flux vector using the Cardelli et al. (1989) parameterization

Compute an N-component power-law logarithmic stellar initial mass function

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

Calculate low precision Right Ascension and declination for the planets given a date

Convert between celestial and Galactic (or Supergalactic) coordinates

Calculate the nutation in longitude and obliquity for a given Julian date

Integrand for luminosity distance calculation

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

co_refract_forward

Calculate the true altitude of a celestial object from an observed altitude.

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

Compute (low-precision) heliocentric coordinates for the planets

Convert from flux (ergs/s/cm^2/A) to astronomical magnitudes

Convert from calendar to Reduced Julian Date

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

Convert from year and day number of year to month and day of month

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

Calculate the illuminated fraction of the Moon at given Julian date(s)

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