{"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":"2026-09-07T23:34:34.813Z","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":"toi-3894-b","name":"TOI-3894 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1361.2625658574862,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":201.3748265,"dec_deg":52.7681036,"epoch_ra_deg":201.649918,"epoch_dec_deg":52.62809,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-3894","semi_major_axis_km":8009469.997277999,"periapsis_km":null,"mass_kg":1.5564621718005108e+27,"mass_msun":0.000782767,"constellation":"Ursa Major","discovered":"2024","featured":false,"url":"https://spacecatalog.org/object/toi-3894-b","radius_km":97443.595704889,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-3894","host_v_mag":11.992,"eccentricity":0.05,"uncertainties":{"mass_kg":[2.657374439659409e+26,2.657374439659409e+26],"radius_km":[3646.092017362,3932.0599987140004],"distance_ly":[12.870130664702696,13.111486384213084],"eccentricity":[0.035,0.052],"host_mass_solar":[0.075,0.089],"inclination_deg":[0.46,0.4],"host_radius_solar":[0.052,0.055],"host_temperature_k":[110,110],"semi_major_axis_km":[127158.19009499998,91254.701127],"orbital_period_days":[0.0000022,0.0000022],"argument_of_periastron_deg":[93,89]},"host_mass_solar":1.138,"inclination_deg":84.63,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.502,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_temperature_k":6000,"orbital_period_days":4.33454,"transit_midpoint_bjd":2459250.50777,"equilibrium_temperature_k":1531,"argument_of_periastron_deg":108},"designations":[{"catalog":"Exoplanet","designation":"TOI-3894 b"},{"catalog":"Host star","designation":"TOI-3894"}],"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."}