{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.682","julian_year":2026.682,"time":"2026-09-07T05:08:32.153Z","years_from_j2000":26.682,"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-9404-b","name":"GJ 9404 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":77.89886309748928,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":184.8472095,"dec_deg":28.3827126,"epoch_ra_deg":185.18564,"epoch_dec_deg":28.233511,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"GJ 9404","semi_major_axis_km":14107079.207009997,"periapsis_km":null,"mass_kg":7.1068797626717415e+25,"mass_msun":0.0000357415,"constellation":"Coma Berenices","discovered":"2023","featured":false,"url":"https://spacecatalog.org/object/gj-9404-b","radius_km":22195.788,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"GJ 9404","host_v_mag":10.62,"eccentricity":0.49,"uncertainties":{"mass_kg":[1.134711894880362e+25,1.134711894880362e+25],"distance_ly":[0.08251756356233608,0.08284371994005282],"eccentricity":[0.13,0.11],"host_mass_solar":[0.07,0.07],"host_radius_solar":[0.018869,0.018869],"semi_major_axis_km":[538552.3345199999,538552.3345199999],"orbital_period_days":[0.0067,0.0044],"argument_of_periastron_deg":[19,19]},"host_mass_solar":0.62,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.626041,"planets_in_system":1,"discovery_facility":"Roque de los Muchachos Observatory","host_spectral_type":"M2V","host_temperature_k":3811,"orbital_period_days":13.4586,"periastron_epoch_bjd":2457095.3,"equilibrium_temperature_k":473.5,"argument_of_periastron_deg":109},"designations":[{"catalog":"Exoplanet","designation":"GJ 9404 b"},{"catalog":"Host star","designation":"GJ 9404"}],"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."}