{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.684","julian_year":2026.684,"time":"2026-09-07T15:52:36.057Z","years_from_j2000":26.684,"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-96-b","name":"GJ 96 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":38.91534820727324,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":35.5624031,"dec_deg":47.8802075,"epoch_ra_deg":36.001531,"epoch_dec_deg":48.002903,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"GJ 96","semi_major_axis_km":43532980.37369999,"periapsis_km":null,"mass_kg":1.1741282028077852e+26,"mass_msun":0.0000590486,"constellation":"Andromeda","discovered":"2018","featured":false,"url":"https://spacecatalog.org/object/gj-96-b","radius_km":29785.727000000003,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"GJ 96","host_v_mag":9.4,"eccentricity":0.44,"uncertainties":{"mass_kg":[1.3735986095920172e+25,1.4452646240055138e+25],"distance_ly":[0.030332543127657135,0.030332543127657135],"eccentricity":[0.11,0.09],"host_mass_solar":[0.07,0.07],"host_radius_solar":[0.017411,0.017411],"host_temperature_k":[62,62],"semi_major_axis_km":[747989.3535,747989.3535],"orbital_period_days":[0.38,0.33],"argument_of_periastron_deg":[14.52,12.45]},"host_mass_solar":0.6,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.580612,"planets_in_system":1,"discovery_facility":"Haute-Provence Observatory","host_spectral_type":"M2","host_temperature_k":3785,"orbital_period_days":73.94,"periastron_epoch_bjd":2455556.39,"equilibrium_temperature_k":257.81,"argument_of_periastron_deg":339.58},"designations":[{"catalog":"Exoplanet","designation":"GJ 96 b"},{"catalog":"Host star","designation":"GJ 96"}],"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."}