{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.685","julian_year":2026.685,"time":"2026-09-08T06:53:15.220Z","years_from_j2000":26.685,"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-143105-b","name":"HD 143105 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":152.5723657757377,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":238.4023547,"dec_deg":68.7199779,"epoch_ra_deg":238.423241,"epoch_dec_deg":68.639653,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 143105","semi_major_axis_km":5669759.29953,"periapsis_km":null,"mass_kg":2.2967422772383621e+27,"mass_msun":0.00115506,"constellation":"Draco","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/hd-143105-b","radius_km":87379.97,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 143105","host_v_mag":6.77005,"uncertainties":{"mass_kg":[1.1388804680520805e+26,1.1388804680520805e+26],"distance_ly":[0.1412257115513499,0.14187802430678337],"host_mass_solar":[0.11,0.11],"host_radius_solar":[0.021426,0.011231],"host_temperature_k":[60,60],"semi_major_axis_km":[134638.08362999998,134638.08362999998],"orbital_period_days":[0.0003,0.0003]},"host_mass_solar":1.51,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.647304,"planets_in_system":1,"discovery_facility":"Haute-Provence Observatory","host_spectral_type":"F5","host_temperature_k":6380,"orbital_period_days":2.1974,"periastron_epoch_bjd":2456531.344,"eccentricity_upper_limit":0.07,"equilibrium_temperature_k":2028.25},"designations":[{"catalog":"Exoplanet","designation":"HD 143105 b"},{"catalog":"Host star","designation":"HD 143105"}],"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."}