{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.685","julian_year":2026.685,"time":"2026-09-08T04:50:15.640Z","years_from_j2000":26.685,"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-9689-b","name":"GJ 9689 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":99.87006132599998,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":303.467731,"dec_deg":13.3888921,"epoch_ra_deg":303.781967,"epoch_dec_deg":13.469806,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"GJ 9689","semi_major_axis_km":17039197.47273,"periapsis_km":null,"mass_kg":5.763141992418681e+25,"mass_msun":0.0000289837,"constellation":"Aquila","discovered":"2020","featured":false,"url":"https://spacecatalog.org/object/gj-9689-b","radius_km":19580.767,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"GJ 9689","host_v_mag":11.297,"eccentricity":0.29,"uncertainties":{"mass_kg":[8.420756693585845e+24,8.420756693585845e+24],"distance_ly":[0.1364964440744571,0.1364964440744571],"eccentricity":[0.13,0.11],"host_mass_solar":[0.06,0.06],"host_radius_solar":[0.06,0.06],"host_temperature_k":[69,69],"semi_major_axis_km":[583431.6957299999,583431.6957299999],"orbital_period_days":[0.01,0.01],"argument_of_periastron_deg":[22.88,20.67]},"host_mass_solar":0.59,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.57,"planets_in_system":1,"discovery_facility":"Roque de los Muchachos Observatory","host_spectral_type":"M0.5","host_temperature_k":3836,"orbital_period_days":18.27,"periastron_epoch_bjd":2456406.17,"equilibrium_temperature_k":453.04,"argument_of_periastron_deg":173.73},"designations":[{"catalog":"Exoplanet","designation":"GJ 9689 b"},{"catalog":"Host star","designation":"GJ 9689"}],"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."}