API VERSION: 1.2 API SOURCE: NASA/JPL Horizons API ******************************************************************************* Revised: May 17, 2025 GALEX Space Telescope -127783 http://www.galex.caltech.edu/index.html NOTE: GALEX was decommissioned September 30, 2011 and is no longer active. BACKGROUND: Launched: April 28, 2003 8 a.m. (EDT) [Pegasus rocket] The GALEX mission is a partnership between the California Institute of Technology (Caltech) and NASA's Jet Propulsion Laboratory (JPL) with universities, science institutes, laboratories, and commercial technology providers from around the world. Caltech hosts the GALEX science center and has overall responsibility for the project. JPL constructed the GALEX science instrument, performed calibration, and is responsible for project management. Leading the GALEX project is the principal investigator, professor Chris Martin, of Caltech. GALEX SPACE TELESCOPE: Galaxy Evolution Explorer: Earth orbiting space telescope observing galaxies in ultraviolet wavelengths to investigate the causes and evolution of star formation over the history of the universe. With an original 29-month mission complete, mission was extended in 2006. PHYSICAL DATA: Length : 2 m (6.5 feet) Weight : 280 kg (617 lbs) Width (solar panels unfurled): 2.8 m (9 ft) Width (launch configuration) : 1.1 m (3.7 ft) Battery lifetime (projected): 12 years Orbit stability : 25 years (post-launch) DATA RELEASE: http://galex.stsci.edu/GR4/ SPACECRAFT TRAJECTORY: The trajectory here is a concatenation of publicly released JSpOC two-line elements. These can usually only be propagated reliably "days" into the future, so have to be updated fairly frequently to maintain accuracy. ******************************************************************************* ******************************************************************************* Ephemeris / API_USER Sun May 18 04:04:28 2025 Pasadena, USA / Horizons ******************************************************************************* Target body name: GALEX (spacecraft) (-127783) {source: galex} Center body name: Earth (399) {source: DE441} Center-site name: Swan Reach Imaging, Glenalta ******************************************************************************* Start time : A.D. 2025-Apr-19 00:00:00.0000 UT Stop time : A.D. 2025-May-01 00:00:00.0000 UT Step-size : 10 minutes ******************************************************************************* Target pole/equ : undefined Target radii : undefined Center geodetic : 139.5701, -34.5440227, .056888 {E-lon(deg),Lat(deg),Alt(km)} Center cylindric: 139.5701,5259.32258,-3596.34777 {E-lon(deg),Dxy(km),Dz(km)} Center pole/equ : ITRF93 {East-longitude positive} Center radii : 6378.137, 6378.137, 6356.752 km {Equator_a, b, pole_c} Target primary : Earth Vis. interferer : MOON (R_eq= 1737.400) km {source: DE441} Rel. light bend : Sun {source: DE441} Rel. lght bnd GM: 1.3271E+11 km^3/s^2 Atmos refraction: NO (AIRLESS) RA format : HMS Time format : CAL Calendar mode : Mixed Julian/Gregorian RTS-only print : NO EOP file : eop.250516.p250812 EOP coverage : DATA-BASED 1962-JAN-20 TO 2025-MAY-16. PREDICTS-> 2025-AUG-11 Units conversion: 1 au= 149597870.700 km, c= 299792.458 km/s, 1 day= 86400.0 s Table cut-offs 1: Elevation ( 0.0deg=YES),Airmass (>38.000=NO), Daylight (YES) Table cut-offs 2: Solar elongation ( 12.0,180.0=YES),Local Hour Angle( 0.0=NO ) Table cut-offs 3: RA/DEC angular rate ( 0.0=NO ) *************************************************************************************************************************************************************************************************************************************************** Date__(UT)__HR:MN R.A._____(ICRF)_____DEC Azi____(a-app)___Elev APmag S-brt r rdot delta deldot S-O-T /r S-T-O T-O-M/MN_Illu% RA_3sigma DEC_3sigma Sky_motion Sky_mot_PA RelVel-ANG *************************************************************************************************************************************************************************************************************************************************** $$SOE >..... Elevation Cut-off Requested .....< >..... Daylight Cut-off Requested .....< 2025-Apr-19 09:10 At 11 55 22.72 +07 57 30.0 61.392645 23.464370 n.a. n.a. 1.004410181722 7.4838183 0.00000942633049 5.0094496 145.9463 /T 34.0533 104.4/ 66.6903 n.a. n.a. 44648.452 94.117220 44.559895 >..... Elevation Cut-off Requested .....< 2025-Apr-19 10:50 r 07 19 35.63 +12 12 25.7 313.933673 30.056263 n.a. n.a. 1.004434629558 7.1253973 0.00000805482844 -3.2030676 80.6017 /T 99.3974 163.2/ 65.8203 n.a. n.a. 65568.720 76.703808 -26.64484 >..... Elevation Cut-off Requested .....< 2025-Apr-19 12:30 r 06 16 53.59 +07 52 36.6 281.951471 3.376535 n.a. n.a. 1.004458779847 6.6791878 0.00001786888351 -5.1783303 65.9638 /T 114.0347 158.6/ 65.0269 n.a. n.a. 23095.148 67.398287 -46.07114 2025-Apr-19 12:40 t 14 33 28.03 +41 46 17.6 29.589816 4.948973 n.a. n.a. 1.004478682717 2.9382398 0.00001681489703 4.9684418 126.0157 /L 53.9843 91.6/ 64.9528 n.a. n.a. 25428.318 94.291453 43.872457 >..... Elevation Cut-off Requested .....< 2025-Apr-19 14:20 r 11 15 47.15 +47 51 49.4 338.365778 2.524264 n.a. n.a. 1.004499652075 2.1070327 0.00001835194340 1.0909912 111.7607 /T 68.2385 126.8/ 64.2725 n.a. n.a. 32020.792 59.369164 8.7357706 >..... Elevation Cut-off Requested .....< >..... Daylight Cut-off Requested .....< >..... Elevation Cut-off Requested .....< >..... Elevation Cut-off Requested .....< >..... Elevation Cut-off Requested .....< 2025-Apr-20 09:40 r 05 25 26.56 +07 39 40.9 300.590826 25.543999 n.a. n.a. 1.004688007397 7.8152817 0.00000894020884 -4.6703973 52.5810 /T 127.4185 143.2/ 56.6630 n.a. n.a. 49981.664 83.159945 -40.85074 >..... Elevation Cut-off Requested .....< 2025-Apr-20 11:20 r 04 51 50.85 +04 06 37.7 276.211501 1.685545 n.a. n.a. 1.004712675316 7.6106653 0.00001900887878 -5.7879993 44.9363 /T 135.0627 133.2/ 55.7231 n.a. n.a. 18535.242 78.079503 -53.65488 2025-Apr-20 11:30 t 13 29 12.05 +34 06 19.3 34.225437 11.128549 n.a. n.a. 1.004738628168 4.9202264 0.00001356415474 4.9450932 133.9868 /T 46.0132 107.2/ 55.6328 n.a. n.a. 31568.512 93.136753 43.695753 >..... Elevation Cut-off Requested .....< 2025-Apr-20 13:10 r 09 54 32.30 +40 01 45.6 332.261408 8.122140 n.a. n.a. 1.004760990596 4.2009833 0.00001502239626 0.1160044 104.4926 /T 75.5064 150.3/ 54.7816 n.a. n.a. 39535.656 59.966098 0.9286542 >..... Elevation Cut-off Requested .....< >..... Daylight Cut-off Requested .....< >..... Elevation Cut-off Requested .....< >..... Elevation Cut-off Requested .....< >..... Elevation Cut-off Requested .....< 2025-Apr-21 08:30 Cr 03 49 35.40 +08 59 31.2 296.290001 19.238585 n.a. n.a. 1.004939689003 7.7938200 0.00001055962090 -5.4172878 28.0646 /T 151.9354 111.4/ 47.0656 n.a. n.a. 36469.834 88.513716 -49.32929 2025-Apr-21 08:40 Nt 13 21 46.89 +10 06 38.9 76.990893 1.226263 n.a. n.a. 1.004970149242 6.9077873 0.00001931747918 6.2349064 156.4359 /T 23.5640 109.9/ 46.9644 n.a. n.a. 15147.766 82.338467 60.434659 >..... Elevation Cut-off Requested .....< 2025-Apr-21 10:20 t 12 17 02.23 +25 58 03.1 37.866659 18.583621 n.a. n.a. 1.004993956880 6.4445062 0.00001075156610 4.7181074 135.1024 /T 44.8973 130.0/ 45.9565 n.a. n.a. 41323.914 91.410079 41.302244 >..... Elevation Cut-off Requested .....< 2025-Apr-21 12:00 r 08 22 00.56 +30 11 57.5 322.262436 13.435373 n.a. n.a. 1.005017388502 5.9029702 0.00001257675929 -1.3447143 89.4257 /T 90.5733 170.5/ 44.9884 n.a. n.a. 46341.235 60.783809 -10.80548 >..... Elevation Cut-off Requested .....< >..... Daylight Cut-off Requested .....< >..... Elevation Cut-off Requested .....< >..... Elevation Cut-off Requested .....< >..... Solar Elongation Cut-off Requested .....< >..... Elevation Cut-off Requested .....< 2025-Apr-22 09:10 At 10 50 20.56 +18 05 12.1 38.264121 27.757370 n.a. n.a. 1.005245460837 7.3640607 0.00000846966283 4.1038556 124.3038 /T 55.6959 160.0/ 36.1876 n.a. n.a. 57081.652 90.021733 35.080036 >..... Elevation Cut-off Requested .....< 2025-Apr-22 10:50 r 06 40 15.40 +19 14 27.9 308.637540 16.741372 n.a. n.a. 1.005269523526 7.0470363 0.00001135505377 -3.0959317 67.3679 /T 112.6314 139.5/ 35.1951 n.a. n.a. 47070.270 63.830617 -25.60479 >..... Elevation Cut-off Requested .....< 2025-Apr-22 12:40 r 12 51 13.43 +55 08 50.1 7.242759 -0.215943 n.a. n.a. 1.005313603172 3.1608668 0.00002026132708 3.7216780 111.0334 /T 68.9661 126.9/ 34.1439 n.a. n.a. 25078.868 83.492860 31.216141 >..... Elevation Cut-off Requested .....< >..... Daylight Cut-off Requested .....< >..... Elevation Cut-off Requested .....< >..... Elevation Cut-off Requested .....< >..... Elevation Cut-off Requested .....< >..... Elevation Cut-off Requested .....< 2025-Apr-23 09:40 r 04 56 56.06 +10 09 24.7 295.353592 16.510555 n.a. n.a. 1.005518325245 7.5268983 0.00001144103971 -4.5900836 42.4911 /T 137.5086 101.2/ 25.7357 n.a. n.a. 39712.325 70.712271 -39.88998 >..... Elevation Cut-off Requested .....< 2025-Apr-23 11:30 t 11 46 50.91 +49 06 33.9 8.676865 5.660251 n.a. n.a. 1.005567977056 4.9799489 0.00001635550039 3.6080453 111.3039 /T 68.6956 138.7/ 24.7220 n.a. n.a. 31364.353 84.214492 30.196933 >..... Elevation Cut-off Requested .....< >..... Daylight Cut-off Requested .....< >..... Elevation Cut-off Requested .....< >..... Elevation Cut-off Requested .....< >..... Elevation Cut-off Requested .....< 2025-Apr-24 08:30 Cr 03 20 51.22 +05 36 42.9 286.905383 13.610980 n.a. n.a. 1.005764853384 7.3063054 0.00001252661660 -5.4944396 19.5458 /T 160.4543 64.5/ 17.0155 n.a. n.a. 30256.589 80.151033 -50.17972 2025-Apr-24 08:40 Nt 12 47 17.87 +21 45 41.1 60.985513 3.078935 n.a. n.a. 1.005793877406 6.7026454 0.00001800844487 6.0671572 140.1999 /T 39.8000 151.0/ 16.9395 n.a. n.a. 17528.034 87.958444 57.836095 >..... Elevation Cut-off Requested .....< 2025-Apr-24 10:20 t 10 35 09.26 +42 03 59.6 9.042321 12.744713 n.a. n.a. 1.005817074505 6.2987202 0.00001283034952 3.2612634 106.5632 /T 73.4364 142.4/ 16.1600 n.a. n.a. 41133.664 83.898679 27.079158 >..... Elevation Cut-off Requested .....< 2025-Apr-24 12:00 r 07 40 53.47 +35 30 40.4 317.048151 2.259384 n.a. n.a. 1.005839931383 5.8195798 0.00001852512555 -1.1067589 77.1289 /T 102.8701 121.8/ 15.3687 n.a. n.a. 31772.269 51.496955 -8.841752 >..... Elevation Cut-off Requested .....< >..... Daylight Cut-off Requested .....< >..... Elevation Cut-off Requested .....< >..... Elevation Cut-off Requested .....< >..... Elevation Cut-off Requested .....< >..... Solar Elongation Cut-off Requested .....< >..... Elevation Cut-off Requested .....< 2025-Apr-25 09:10 At 09 10 13.10 +33 41 38.2 6.474695 21.526440 n.a. n.a. 1.006061732454 6.9922274 0.00000988015566 2.4970340 94.5819 /T 85.4179 127.1/ 8.9309 n.a. n.a. 56143.188 82.372958 20.426657 >..... Elevation Cut-off Requested .....< 2025-Apr-25 10:50 r 06 15 25.74 +26 18 47.0 307.621589 5.778926 n.a. n.a. 1.006084984002 6.7383663 0.00001631683051 -2.4297811 58.3775 /T 121.6218 91.8/ 8.3393 n.a. n.a. 34329.224 54.246038 -19.74262 >..... Elevation Cut-off Requested .....< >..... Daylight Cut-off Requested .....< >..... Elevation Cut-off Requested .....< >..... Elevation Cut-off Requested .....< >..... Elevation Cut-off Requested .....< >..... Elevation Cut-off Requested .....< 2025-Apr-26 09:40 r 04 44 21.04 +16 48 49.0 296.631397 7.688013 n.a. n.a. 1.006326147039 6.9880783 0.00001526538372 -3.8399579 36.1389 /T 143.8610 56.8/ 3.2255 n.a. n.a. 32915.805 59.116657 -32.30476 >..... Elevation Cut-off Requested .....< >..... Daylight Cut-off Requested .....< >..... Elevation Cut-off Requested .....< >..... Elevation Cut-off Requested .....< >..... Elevation Cut-off Requested .....< >..... Elevation Cut-off Requested .....< 2025-Apr-27 08:30 Cr 03 12 16.02 +09 04 16.3 286.593291 7.491915 n.a. n.a. 1.006564571827 6.5577836 0.00001538841792 -4.9855714 13.9893 /T 166.0109 21.9/ 0.4936 n.a. n.a. 27765.414 67.076418 -43.99167 2025-Apr-27 08:40 Nt 11 50 50.33 +37 54 43.3 39.122498 2.611304 n.a. n.a. 1.006591313706 6.3508426 0.00001826932307 5.4761076 117.7288 /T 62.2709 120.7/ 0.4827 n.a. n.a. 20992.711 95.297542 49.751093 >..... Elevation Cut-off Requested .....< 2025-Apr-27 10:20 r 08 48 31.93 +50 34 26.7 348.859289 3.555595 n.a. n.a. 1.006613580767 6.0379427 0.00001762484680 2.0372095 83.9439 /T 96.0556 87.2/ 0.3737 n.a. n.a. 32335.949 67.565262 16.475223 >..... Elevation Cut-off Requested .....< >..... Daylight Cut-off Requested .....< >..... Elevation Cut-off Requested .....< >..... Elevation Cut-off Requested .....< >..... Elevation Cut-off Requested .....< >..... Elevation Cut-off Requested .....< >..... Elevation Cut-off Requested .....< 2025-Apr-28 09:10 Ar 07 30 48.76 +43 23 59.0 345.005855 9.888629 n.a. n.a. 1.006848711714 6.4779857 0.00001409469862 1.2997347 70.9978 /T 109.0021 62.3/ 0.5949 n.a. n.a. 41422.320 67.737279 10.434650 >..... Elevation Cut-off Requested .....< >..... Daylight Cut-off Requested .....< >..... Elevation Cut-off Requested .....< >..... Elevation Cut-off Requested .....< >..... Elevation Cut-off Requested .....< >..... Elevation Cut-off Requested .....< >..... Elevation Cut-off Requested .....< >..... Elevation Cut-off Requested .....< >..... Elevation Cut-off Requested .....< >..... Elevation Cut-off Requested .....< >..... Elevation Cut-off Requested .....< >..... Elevation Cut-off Requested .....< >..... Solar Elongation Cut-off Requested .....< >..... Elevation Cut-off Requested .....< $$EOE *************************************************************************************************************************************************************************************************************************************************** Column meaning: TIME Times PRIOR to 1962 are UT1, a mean-solar time closely related to the prior but now-deprecated GMT. Times AFTER 1962 are in UTC, the current civil or "wall-clock" time-scale. UTC is kept within 0.9 seconds of UT1 using integer leap-seconds for 1972 and later years. Conversion from the internal Barycentric Dynamical Time (TDB) of solar system dynamics to the non-uniform civil UT time-scale requested for output has not been determined for UTC times after the next July or January 1st. Therefore, the last known leap-second is used as a constant over future intervals. Time tags refer to the UT time-scale conversion from TDB on Earth regardless of observer location within the solar system, although clock rates may differ due to the local gravity field and no analog to "UT" may be defined for that location. Any 'b' symbol in the 1st-column denotes a B.C. date. First-column blank (" ") denotes an A.D. date. CALENDAR SYSTEM Mixed calendar mode was active such that calendar dates after AD 1582-Oct-15 (if any) are in the modern Gregorian system. Dates prior to 1582-Oct-5 (if any) are in the Julian calendar system, which is automatically extended for dates prior to its adoption on 45-Jan-1 BC. The Julian calendar is useful for matching historical dates. The Gregorian calendar more accurately corresponds to the Earth's orbital motion and seasons. A "Gregorian-only" calendar mode is available if such physical events are the primary interest. NOTE: "n.a." in output means quantity "not available" at the print-time. SOLAR PRESENCE (OBSERVING SITE) Time tag is followed by a blank, then a solar-presence condition code: '*' Daylight (refracted solar upper-limb on or above apparent horizon) 'C' Civil twilight/dawn 'N' Nautical twilight/dawn 'A' Astronomical twilight/dawn ' ' Night OR geocentric ephemeris LUNAR PRESENCE WITH TARGET RISE/TRANSIT/SET EVENT MARKER (OBSERVING SITE) The solar-presence code column is immediately followed by another marker: 'm' Refracted upper-limb of Moon on or above apparent horizon ' ' Refracted upper-limb of Moon below apparent horizon OR geocentric The lunar presence marker (an ongoing state) can be over-ridden by a target event marker if an event has occurred since the last output step: 'r' Rise (target body on or went above cut-off RTS elevation) 'e' Elevation max (target body maximum elevation angle has occurred) 't' Transit (target body at or passed through observer meridian) 's' Set (target body on or went below cut-off RTS elevation) RTS MARKERS (TVH) Rise and set are with respect to the reference ellipsoid true visual horizon defined by the elevation cut-off angle. Horizon dip and yellow-light refraction (Earth only) are considered. Accuracy is < or = to twice the requested search step-size. 'R.A._____(ICRF)_____DEC' = Astrometric right ascension and declination of the target center with respect to the observing site (coordinate origin) in the reference frame of the planetary ephemeris (ICRF). Compensated for down-leg light-time delay aberration. Units: RA in hours-minutes-seconds of time, HH MM SS.ff{ffff} DEC in degrees-minutes-seconds of arc, sDD MN SC.f{ffff} 'Azi____(a-app)___Elev' = Airless apparent azimuth and elevation of target center. Compensated for light-time, the gravitational deflection of light, stellar aberration, precession and nutation. Azimuth is measured clockwise from north: North(0) -> East(90) -> South(180) -> West(270) -> North (360) Elevation angle is with respect to a plane perpendicular to the reference surface local zenith direction. TOPOCENTRIC ONLY. Units: DEGREES 'APmag S-brt' = The targets' approximate apparent visual magnitude and surface brightness. For planets and natural satellites, output is restricted to solar phase angles covered by observational data. Outside the observed phase angle range, "n.a." may be output to avoid extrapolation beyond the limit of model validity. For Earth-based observers, the estimated dimming due to atmospheric absorption (extinction) is available as a separate, requestable quantity. Surface brightness is the average airless visual magnitude of a square-arcsecond of the illuminated portion of the apparent disk. It is computed only if the target radius is known. Units: MAGNITUDES & MAGNITUDES PER SQUARE ARCSECOND 'r rdot' = The Sun's apparent range ("r", light-time aberrated) and range-rate ("rdot") relative to the target center, as seen by the observer. A positive "rdot" means the target center was moving away from the Sun, negative means moving toward the Sun. Units: AU and KM/S 'delta deldot' = Apparent range ("delta", light-time aberrated) and range-rate ("delta-dot") of the target center relative to the observer. A positive "deldot" means the target center is moving away from the observer, negative indicates movement toward the observer. Units: AU and KM/S 'S-O-T /r' = Sun-Observer-Target apparent SOLAR ELONGATION ANGLE seen from the observers' location at print-time. The '/r' column provides a code indicating the targets' apparent position relative to the Sun in the observers' sky, as described below: Case A: For an observing location on the surface of a rotating body, that body rotational sense is considered: /T indicates target TRAILS Sun (evening sky: rises and sets AFTER Sun) /L indicates target LEADS Sun (morning sky: rises and sets BEFORE Sun) Case B: For an observing point that does not have a rotational model (such as a spacecraft), the "leading" and "trailing" condition is defined by the observers' heliocentric ORBITAL motion: * If continuing in the observers' current direction of heliocentric motion would encounter the targets' apparent longitude first, followed by the Sun's, the target LEADS the Sun as seen by the observer. * If the Sun's apparent longitude would be encountered first, followed by the targets', the target TRAILS the Sun. Two other codes can be output: /* indicates observer is Sun-centered (undefined) /? Target is aligned with Sun center (no lead or trail) The S-O-T solar elongation angle is numerically the minimum separation angle of the Sun and target in the sky in any direction. It does NOT indicate the amount of separation in the leading or trailing directions, which would be defined along the equator of a spherical coordinate system. Units: DEGREES 'S-T-O' = The Sun-Target-Observer angle; the interior vertex angle at target center formed by a vector from the target to the apparent center of the Sun (at reflection time on the target) and the apparent vector from target to the observer at print-time. Slightly different from true PHASE ANGLE (requestable separately) at the few arcsecond level in that it includes stellar aberration on the down-leg from target to observer. Units: DEGREES 'T-O-M/MN_Illu%' = Target-Observer-Moon LUNAR ELONGATION angle and illuminated percentage. The apparent lunar elongation angle between target body center and Moon center, seen from the observing site, along with fraction of the lunar disk illuminated by the Sun. A negative lunar elongation angle indicates the target center is behind the Moon. Units: DEGREES & PERCENT 'RA_3sigma DEC_3sigma' = Uncertainty in Right-Ascension and Declination. Output values are the formal +/- 3 standard-deviations (sigmas) around nominal position. Units: ARCSECONDS 'Sky_motion Sky_mot_PA RelVel-ANG' = Total apparent angular rate of the target in the plane-of-sky. "Sky_mot_PA" is the position angle of the target's direction of motion in the plane-of-sky, measured counter-clockwise from the apparent of-date north pole direction. "RelVel-ANG" is the flight path angle of the target's relative motion with respect to the observer's line-of-sight, in the range [-90,+90], where positive values indicate motion away from the observer, negative values are toward the observer: -90 = target is moving directly toward the observer 0 = target is moving at right angles to the observer's line-of-sight +90 = target is moving directly away from the observer UNITS: ARCSECONDS/MINUTE, DEGREES, DEGREES Computations by ... Solar System Dynamics Group, Horizons On-Line Ephemeris System 4800 Oak Grove Drive, Jet Propulsion Laboratory Pasadena, CA 91109 USA General site: https://ssd.jpl.nasa.gov/ Mailing list: https://ssd.jpl.nasa.gov/email_list.html System news : https://ssd.jpl.nasa.gov/horizons/news.html User Guide : https://ssd.jpl.nasa.gov/horizons/manual.html Connect : browser https://ssd.jpl.nasa.gov/horizons/app.html#/x API https://ssd-api.jpl.nasa.gov/doc/horizons.html command-line telnet ssd.jpl.nasa.gov 6775 e-mail/batch https://ssd.jpl.nasa.gov/ftp/ssd/horizons_batch.txt scripts https://ssd.jpl.nasa.gov/ftp/ssd/SCRIPTS Author : Jon.D.Giorgini@jpl.nasa.gov ***************************************************************************************************************************************************************************************************************************************************