{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.683","julian_year":2026.683,"time":"2026-09-07T14:37:13.841Z","years_from_j2000":26.683,"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":"gj-1252-b","name":"GJ 1252 b","class":"terrestrial_planet","category":"exoplanet","object_type":"Terrestrial planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":66.44783883223214,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":306.9286462,"dec_deg":-56.4622865,"epoch_ra_deg":307.454474,"epoch_dec_deg":-56.373701,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"GJ 1252","semi_major_axis_km":1368820.516905,"periapsis_km":null,"mass_kg":7.883261585484621e+24,"mass_msun":0.00000396461,"constellation":"Telescopium","discovered":"2020","featured":false,"url":"https://spacecatalog.org/object/gj-1252-b","radius_km":7609.073300000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"GJ 1252","host_v_mag":12.68,"eccentricity":0,"uncertainties":{"mass_kg":[1.6722070029815864e+24,1.6722070029815864e+24],"radius_km":[471.9794,471.9794],"distance_ly":[0.06262202452161474,0.06262202452161474],"host_mass_solar":[0.019,0.019],"inclination_deg":[1.8,2.1],"host_radius_solar":[0.02,0.02],"host_temperature_k":[133,140],"semi_major_axis_km":[22439.680604999998,22439.680604999998],"orbital_period_days":[0.0000084,0.0000084]},"host_mass_solar":0.381,"inclination_deg":85,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.391,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_spectral_type":"M3","host_temperature_k":3458,"orbital_period_days":0.5182331,"transit_midpoint_bjd":2458668.09744,"equilibrium_temperature_k":1090,"argument_of_periastron_deg":90},"designations":[{"catalog":"Exoplanet","designation":"GJ 1252 b"},{"catalog":"Host star","designation":"GJ 1252"}],"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."}