{"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":"2026-09-01T19:07:38.722Z","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":"gj-876-e","name":"GJ 876 e","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":15.248365124099871,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":343.3239737,"dec_deg":-14.2665958,"epoch_ra_deg":343.679262,"epoch_dec_deg":-14.123942,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"GJ 876","semi_major_axis_km":50010568.175009996,"periapsis_km":null,"mass_kg":8.719365086975413e+25,"mass_msun":0.0000438509,"constellation":"Aquarius","discovered":"2010","featured":false,"url":"https://spacecatalog.org/object/gj-876-e","radius_km":25002.152000000002,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"GJ 876","host_v_mag":10.16,"eccentricity":0.055,"uncertainties":{"mass_kg":[1.0152685375245345e+25,1.0152685375245345e+25],"distance_ly":[0.0054468115078696155,0.0054468115078696155],"eccentricity":[0.012,0.012],"host_mass_solar":[0.03,0.03],"host_temperature_k":[48.39,48.39],"semi_major_axis_km":[194477.23190999997,194477.23190999997],"orbital_period_days":[0.7,0.7],"argument_of_periastron_deg":[22,22]},"host_mass_solar":0.32,"inclination_deg":59,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.3,"planets_in_system":4,"discovery_facility":"W. M. Keck Observatory","host_spectral_type":"M2.5V","host_temperature_k":3293.74,"orbital_period_days":124.26,"periastron_epoch_bjd":2450602.093,"equilibrium_temperature_k":150.46,"argument_of_periastron_deg":239},"designations":[{"catalog":"Exoplanet","designation":"GJ 876 e"},{"catalog":"Host star","designation":"GJ 876"}],"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."}