{"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":"2026-09-07T15:36:41.951Z","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-115954-b","name":"HD 115954 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":285.85551721692946,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":199.9853694,"dec_deg":38.3691383,"epoch_ra_deg":200.29067,"epoch_dec_deg":38.227908,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 115954","semi_major_axis_km":747989353.5,"periapsis_km":null,"mass_kg":1.603915286794429e+28,"mass_msun":0.00806632,"constellation":"Canes Venatici","discovered":"2021","featured":false,"url":"https://spacecatalog.org/object/hd-115954-b","radius_km":80364.06,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 115954","host_v_mag":8.34,"eccentricity":0.487,"uncertainties":{"mass_kg":[8.731373158880916e+26,1.1578560058515997e+27],"distance_ly":[0.8959515695878941,0.901170071631362],"eccentricity":[0.041,0.095],"host_mass_solar":[0.06,0.06],"inclination_deg":[11,7.7],"host_radius_solar":[0.083,0.083],"host_temperature_k":[26,26],"semi_major_axis_km":[53855233.45199999,194477231.91],"orbital_period_days":[390,1500],"argument_of_periastron_deg":[8.8,7.5]},"host_mass_solar":1.18,"inclination_deg":79,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.213,"planets_in_system":1,"discovery_facility":"Haute-Provence Observatory","host_spectral_type":"G0 V","host_temperature_k":5957,"orbital_period_days":3700,"periastron_epoch_bjd":2456131,"equilibrium_temperature_k":144.9,"argument_of_periastron_deg":185.6},"designations":[{"catalog":"Exoplanet","designation":"HD 115954 b"},{"catalog":"Host star","designation":"HD 115954"}],"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."}