{"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":"2026-09-07T21:35:43.673Z","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":"bd-14-4559-b","name":"BD+14 4559 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":160.9646955307672,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":318.4010002,"dec_deg":14.6893834,"epoch_ra_deg":318.718762,"epoch_dec_deg":14.799995,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"BD+14 4559","semi_major_axis_km":116686339.146,"periapsis_km":null,"mass_kg":1.9740594779569394e+27,"mass_msun":0.000992783,"constellation":"Pegasus","discovered":"2009","featured":false,"url":"https://spacecatalog.org/object/bd-14-4559-b","radius_km":88017.78000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"BD+14 4559","host_v_mag":9.78,"eccentricity":0.29,"uncertainties":{"mass_kg":[8.92123033307463e+26,8.92123033307463e+26],"distance_ly":[0.2752759827929315,0.2759282955483649],"eccentricity":[0.03,0.03],"host_mass_solar":[0.33,0.33],"host_radius_solar":[0.04,0.04],"host_temperature_k":[101,101],"semi_major_axis_km":[7479893.535,7479893.535],"orbital_period_days":[0.99,0.99],"argument_of_periastron_deg":[7.87,7.87]},"host_mass_solar":0.49,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.86,"planets_in_system":1,"discovery_facility":"McDonald Observatory","host_spectral_type":"K2 V","host_temperature_k":4864,"orbital_period_days":268.94,"periastron_epoch_bjd":2453293.71,"equilibrium_temperature_k":246.28,"argument_of_periastron_deg":87.64},"designations":[{"catalog":"Exoplanet","designation":"BD+14 4559 b"},{"catalog":"Host star","designation":"BD+14 4559"}],"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."}