{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.667","julian_year":2026.667,"time":"2026-09-01T16:06:24.802Z","years_from_j2000":26.667,"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":"wolf-503-b","name":"Wolf 503 b","class":"neptune_like_planet","category":"exoplanet","object_type":"Neptune-like planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":145.22438874215717,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":206.8461979,"dec_deg":-6.1393369,"epoch_ra_deg":207.197346,"epoch_dec_deg":-6.273535,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Wolf 503","semi_major_axis_km":8536054.502142,"periapsis_km":null,"mass_kg":3.738577085237403e+25,"mass_msun":0.0000188018,"constellation":"Virgo","discovered":"2018","featured":false,"url":"https://spacecatalog.org/object/wolf-503-b","radius_km":13030.458300000002,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Wolf 503","host_v_mag":10.27,"eccentricity":0.41,"uncertainties":{"mass_kg":[4.1805175074539655e+24,4.120795828776051e+24],"radius_km":[440.0889000000001,440.0889000000001],"distance_ly":[0.31343627898579046,0.31441474811894066],"eccentricity":[0.05,0.05],"host_mass_solar":[0.016,0.023],"inclination_deg":[0.13,0.13],"host_radius_solar":[0.02,0.021],"host_temperature_k":[60,60],"semi_major_axis_km":[82278.828885,82278.828885],"orbital_period_days":[0.000021,0.000021],"argument_of_periastron_deg":[10,10]},"host_mass_solar":0.688,"inclination_deg":89.87,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.689,"planets_in_system":1,"discovery_facility":"K2","host_spectral_type":"K3.5 V","host_temperature_k":4716,"orbital_period_days":6.00127,"transit_midpoint_bjd":2458191.361449,"equilibrium_temperature_k":790,"argument_of_periastron_deg":112},"designations":[{"catalog":"Exoplanet","designation":"Wolf 503 b"},{"catalog":"Host star","designation":"Wolf 503"}],"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":"2026-08-30T09:56:50.739Z","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."}