{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T17:44:21.866Z","years_from_j2000":26.681,"frame":"date","applied":"Proper motion, then precession and nutation. The catalogued J2000 position is carried along the great circle the object's own published motion puts it on, at a constant velocity, and the result is referred to the true equator and equinox of this instant. Those are separate things: the motion moves the object, and the rotation turns the grid under it by about fifty arcseconds a year, with nutation adding up to another seventeen.","excluded":"Parallax, the radial-velocity perspective term, aberration and refraction; each is below the accuracy of the catalogued positions themselves. An object with no published proper motion comes back where the catalogue has it rather than at a fabricated zero, and says so with a null pm_ra_mas_yr. A body with no fixed position is not propagated at all — its place comes from an ephemeris, which is what /api/v1/visible answers with."},"slug":"hd-37124-d","name":"HD 37124 d","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":103.27219850196333,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":84.2599947,"dec_deg":20.7289784,"epoch_ra_deg":84.660492,"epoch_dec_deg":20.7457,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 37124","semi_major_axis_km":419921223.05489993,"periapsis_km":null,"mass_kg":1.3211013429404134e+27,"mass_msun":0.000664401,"constellation":"Taurus","discovered":"2005","featured":false,"url":"https://spacecatalog.org/object/hd-37124-d","radius_km":89293.40000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 37124","host_v_mag":7.68,"eccentricity":0.16,"uncertainties":{"mass_kg":[1.1198991269178792e+26,1.1198991269178792e+26],"distance_ly":[0.24690037793157477,0.247878847064725],"eccentricity":[0.14,0.14],"host_radius_solar":[0.017173,0.017173],"host_temperature_k":[48.74,48.74],"semi_major_axis_km":[5684719.086599999,5684719.086599999],"orbital_period_days":[38,38]},"host_mass_solar":0.85,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.949168,"planets_in_system":3,"discovery_facility":"W. M. Keck Observatory","host_spectral_type":"G4 V","host_temperature_k":5698.64,"orbital_period_days":1862,"periastron_epoch_bjd":2448558,"transit_midpoint_bjd":2454455,"equilibrium_temperature_k":159.79,"argument_of_periastron_deg":0},"designations":[{"catalog":"Exoplanet","designation":"HD 37124 d"}],"source":{"id":"exoplanet_archive","name":"NASA Exoplanet Archive (Planetary Systems Composite Parameters)","url":"https://exoplanetarchive.ipac.caltech.edu/cgi-bin/TblView/nph-tblView?app=ExoTbls&config=PSCompPars","license":"Public domain (NASA)"},"updated_at":"2026-09-02T19:50:56.720Z","attribution":"Data from SpaceCatalog.org. Individual records carry their source and license in `source`; attribution is required for CC-BY and CC-BY-SA rows."}