 |
libTheSky
Routines to compute sky positions of Sun, Moon, planets and more
|
|
libTheSky
Routines to compute sky positions of Sun, Moon, planets and more
|
Contains procedures to determine the visibility of objects for libTheSky. More...
Go to the source code of this file.
Modules | |
| module | thesky_visibility |
| Procedures to determine the visibility of objects. | |
Functions/Subroutines | |
| subroutine | thesky_visibility::best_planet_xsmag (jdin, plid, jdout, xsmag, rscwarn) |
| Find the moment (JD) of optimal excess magnitude for a planet, i.e. the lowest mag - lim.mag. | |
| real(double) function | thesky_visibility::best_planet_visibility (jd, pl) |
| Find a rough indication for the best moment (JD) to observe a planet on a given day (jd). Start out by demanding that Sun alt < -6deg, but relax this if problematic. This often results in the moment where Sun alt is indeed -6deg. | |
| subroutine | thesky_visibility::planet_visibility_tonight (jd, pl, sunalt, plalt, comp, plvis, plazs, rts, tts, sts, ras, tas, sas, rscwarn) |
| Compute when a given planet is visible in a given night. | |
| logical function | thesky_visibility::comet_invisible (jd, cometid, mlim, minalt) |
| Cheap function to determine whether a comet is invisible at a given time, based on a magnitude and altitude limit. | |
| real(double) function | thesky_visibility::transitalt (lat, dec) |
| Compute the transit altitude of an object with given declination for an observer with a given geographic latitude. | |
| subroutine | thesky_visibility::best_obs_date_ra (year, ra, accuracy, mon, dy) |
| Compute the best date in the year to observe an object with a given right ascension. | |
| real(double) function | thesky_visibility::get_dra_obj (jd) |
| Compute the difference between a given right ascension and the RA of the Sun, used privately by best_obs_date_ra() | |
| real(double) function | thesky_visibility::airmass (alt) |
| Compute the airmass for a celestial object with a given TRUE altitude. | |
| real(double) function | thesky_visibility::airmass_la (alt) |
| Compute the airmass for a celestial object with a given apparent altitude; low-accuracy alternative for airmass() | |
| real(double) function | thesky_visibility::extinction_magpam (ele) |
| Compute the extinction in magnitdes per unit airmass for an observer with given elevation. | |
| real(double) function | thesky_visibility::extinction_mag (alt, ele) |
| Compute the extinction in magnitdes for an observer with given elevation and an object with given TRUE altitude. | |
| real(double) function | thesky_visibility::extinction_fac (alt, ele) |
| Compute the extinction factor for an observer with given elevation and an object with given altitude. | |
| real(double) function | thesky_visibility::limmag_full (year, month, obselev, obslat, sunalt, sunelon, moonphase, moonalt, moonelon, objalt, humid, airtemp, snrat, verbosity) |
| Calculate limiting magnitude based on Sun and Moon positions and phase, and on the altitude of the observed object. | |
| subroutine | thesky_visibility::limmag_extinction (month, obslat, obselev, objalt, relhum, temp, band1, band2, extcoef, extmag) |
| Calculate limiting magnitude based on Sun altitude and Moon phase. | |
| subroutine | thesky_visibility::limmag_skybrightness (year, sunalt, sunelon, moonphase, moonalt, moonelon, objalt, band1, band2, extcoef, skybr) |
| Calculate sky brightness based on Sun altitude and Moon phase. | |
| real(double) function | thesky_visibility::limmag_jd (jd, objra, objdec, objalt, lat, height) |
| Calculate limiting magnitude based on JD and object altitude, wrapper for limmag_full() | |
| real(double) function | thesky_visibility::limmag_zenith_jd (jd, lat, lon, height) |
| Calculate limiting magnitude for the local zenith, based on JD and observer's location. | |
| real(double) function | thesky_visibility::limmag_jd_pl (jd, pl) |
| Calculate limiting magnitude based on JD and planet ID, wrapper for limmag_jd() | |
| real(double) function | thesky_visibility::limmag_sun_airmass (month, sunalt, sunaz, objalt, objaz, lat, height) |
| Calculate limiting magnitude based on Sun altitude and object altitude (airmass). Assumes New Moon. | |
| real(double) function | thesky_visibility::limmag_sun (sunalt) |
| Calculate limiting magnitude, based on the altitude of the Sun. Simplified version of limmag_full() | |
| real(double) function | thesky_visibility::pl_xsmag (jd, pl) |
| Compute the excess magnitude for planet pl at JD, considering Sun, Moon and airmass. | |
| real(double) function | thesky_visibility::pl_xsmag_pl (jd) |
| Compute the excess magnitude at JD, wrapper for pl_xsmag() for solvers. The planet ID pl0 is passed through module planetdata. | |
| real(double) function | thesky_visibility::pl_xsmag_la (jd, pl) |
| Compute the excess magnitude for planet pl at JD, considering airmass and Sun alt - low-accuracy version of pl_xsmag() | |
| real(double) function | thesky_visibility::pl_xsmag_la_pl (jd) |
| Compute the excess magnitude at JD, wrapper for pl_xsmag_la() for solvers. The planet ID pl0 is passed through module planetdata. | |
| real(double) function | thesky_visibility::aperture (xsmag, pupil, tc) |
| Aperture diameter in centimetres needed to observe an object with given excess magnitude (0: no instrument needed) | |
| elemental real(double) function | thesky_visibility::skybrightness_mas2_from_mlim (mlim) |
| Convert naked-eye visual limiting magnitude (V) to sky surface brightness in (B) magnitudes per square arcsecond. | |
| elemental real(double) function | thesky_visibility::skybrightness_mlim_from_mas2 (skybright) |
| Convert sky surface brightness in (B) magnitudes per square arcsecond to naked-eye visual limiting magnitude (V) | |
| elemental real(double) function | thesky_visibility::skybrightness_mlim_from_cdm2 (cdm2) |
| Convert sky brightness in candela per square meter to naked-eye visual limiting magnitude (V) | |
| elemental real(double) function | thesky_visibility::skybrightness_cdm2_from_mlim (mlim) |
| Convert limiting visual magnitude to sky brightness in candela per square meter. | |
| elemental real(double) function | thesky_visibility::skybrightness_cdm2_from_nl (nl) |
| Convert sky brightness in nanolambert to candela per square meter. | |
| elemental real(double) function | thesky_visibility::skybrightness_nl_from_cdm2 (cdm2) |
| Convert sky brightness in candela per square meter to nanolambert. | |
Contains procedures to determine the visibility of objects for libTheSky.
Definition in file visibility.f90.
1.12.0
