{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.684","julian_year":2026.684,"time":"2026-09-07T18:51:30.125Z","years_from_j2000":26.684,"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-141399-b","name":"HD 141399 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":120.7329801830292,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":236.7235392,"dec_deg":46.986288,"epoch_ra_deg":236.935147,"epoch_dec_deg":46.902516,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 141399","semi_major_axis_km":62083116.34049999,"periapsis_km":null,"mass_kg":8.560584851524804e+26,"mass_msun":0.000430524,"constellation":"Boötes","discovered":"2014","featured":false,"url":"https://spacecatalog.org/object/hd-141399-b","radius_km":91206.83000000002,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 141399","host_v_mag":7.20856,"eccentricity":0.04,"uncertainties":{"mass_kg":[5.694402340260402e+25,5.694402340260402e+25],"distance_ly":[0.10730544826880858,0.10763160464652534],"eccentricity":[0.02,0.02],"host_mass_solar":[0.08,0.08],"host_radius_solar":[0.031321,0.031321],"host_temperature_k":[40,40],"semi_major_axis_km":[1645576.5776999998,1645576.5776999998],"orbital_period_days":[0.05,0.05],"argument_of_periastron_deg":[80,80]},"host_mass_solar":1.07,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.387236,"planets_in_system":4,"discovery_facility":"Multiple Observatories","host_spectral_type":"K0","host_temperature_k":5600,"orbital_period_days":94.44,"periastron_epoch_bjd":2456998,"transit_midpoint_bjd":2455205.19,"equilibrium_temperature_k":493.71,"argument_of_periastron_deg":-90},"designations":[{"catalog":"Exoplanet","designation":"HD 141399 b"}],"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."}