{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.683","julian_year":2026.683,"time":"2026-09-07T12:50:44.058Z","years_from_j2000":26.683,"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":"gj-414-a-b","name":"GJ 414 A 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":38.77771021587677,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":167.7745044,"dec_deg":30.4451688,"epoch_ra_deg":168.138371,"epoch_dec_deg":30.299361,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"GJ 414 A","semi_major_axis_km":34766545.15068,"periapsis_km":null,"mass_kg":4.538847579521448e+25,"mass_msun":0.0000228265,"constellation":"Ursa Major","discovered":"2021","featured":false,"url":"https://spacecatalog.org/object/gj-414-a-b","radius_km":16774.403000000002,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"GJ 414 A","host_v_mag":8.31,"eccentricity":0.45,"uncertainties":{"mass_kg":[1.307904763046312e+25,1.4572089597410965e+25],"radius_km":[5421.385,7781.282],"distance_ly":[0.02185247730702181,0.02185247730702181],"eccentricity":[0.22,0.19],"host_mass_solar":[0.08,0.08],"host_radius_solar":[0.14,0.14],"host_temperature_k":[109,109],"semi_major_axis_km":[1481018.91993,1376300.4104399998],"orbital_period_days":[0.26,0.1],"argument_of_periastron_deg":[52,36]},"host_mass_solar":0.65,"stars_in_system":2,"discovery_method":"Radial Velocity","host_radius_solar":0.68,"planets_in_system":2,"discovery_facility":"W. M. Keck Observatory","host_spectral_type":"K7 V","host_temperature_k":4120,"orbital_period_days":50.8,"periastron_epoch_bjd":2454203.07,"transit_midpoint_bjd":2455179.9,"equilibrium_temperature_k":308.6,"argument_of_periastron_deg":111},"designations":[{"catalog":"Exoplanet","designation":"GJ 414 A b"}],"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."}