{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.672","julian_year":2026.672,"time":"2026-09-03T13:09:29.934Z","years_from_j2000":26.672,"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":"k2-124-b","name":"K2-124 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":457.87463085765023,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":133.6410515,"dec_deg":23.1329509,"epoch_ra_deg":134.031735,"epoch_dec_deg":23.031069,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"K2-124","semi_major_axis_km":7330295.664299999,"periapsis_km":null,"mass_kg":5.2256468843174565e+25,"mass_msun":0.0000262805,"constellation":"Cancer","discovered":"2017","featured":false,"url":"https://spacecatalog.org/object/k2-124-b","radius_km":18496.49,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"K2-124","host_v_mag":16.692,"eccentricity":0.08,"uncertainties":{"radius_km":[637.8100000000001,637.8100000000001],"distance_ly":[4.226986655208995,4.305264185861013],"eccentricity":[0.06663,0.15519],"host_mass_solar":[0.042,0.013],"inclination_deg":[0.27,0.32],"host_radius_solar":[0.009,0.016],"host_temperature_k":[70,63],"semi_major_axis_km":[299195.7414,299195.7414],"orbital_period_days":[0.000031,0.000036],"argument_of_periastron_deg":[110.8238,137.5335]},"host_mass_solar":0.39,"inclination_deg":89.03,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.388,"planets_in_system":1,"discovery_facility":"K2","host_temperature_k":3570,"orbital_period_days":6.413651,"transit_midpoint_bjd":2457142.18106,"equilibrium_temperature_k":442,"argument_of_periastron_deg":-26.8},"designations":[{"catalog":"Exoplanet","designation":"K2-124 b"},{"catalog":"Host star","designation":"K2-124"}],"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."}