{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.686","julian_year":2026.686,"time":"2026-09-08T17:17:25.031Z","years_from_j2000":26.686,"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-3884-b","name":"TOI-3884 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":140.7195168531335,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":181.5718341,"dec_deg":12.5070258,"epoch_ra_deg":181.915643,"epoch_dec_deg":12.357425,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-3884","semi_major_axis_km":5400483.13227,"periapsis_km":null,"mass_kg":1.9463295081132107e+26,"mass_msun":0.0000978837,"constellation":"Virgo","discovered":"2022","featured":false,"url":"https://spacecatalog.org/object/toi-3884-b","radius_km":41011.183,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-3884","host_v_mag":15.744,"eccentricity":0.06,"uncertainties":{"mass_kg":[4.407459886430038e+25,4.365654711355498e+25],"radius_km":[1275.6200000000001,1275.6200000000001],"distance_ly":[0.5472904018086955,0.5512042783412964],"eccentricity":[0.04,0.06],"host_mass_solar":[0.018,0.018],"inclination_deg":[0.18,0.13],"host_radius_solar":[0.012,0.012],"host_temperature_k":[88,88],"semi_major_axis_km":[119678.29656,119678.29656],"orbital_period_days":[0.0000098,0.0000098],"argument_of_periastron_deg":[2,245]},"host_mass_solar":0.298,"inclination_deg":89.81,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.302,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_spectral_type":"M4","host_temperature_k":3180,"orbital_period_days":4.5445828,"transit_midpoint_bjd":2459556.51669,"equilibrium_temperature_k":441,"argument_of_periastron_deg":-112},"designations":[{"catalog":"Exoplanet","designation":"TOI-3884 b"},{"catalog":"Host star","designation":"TOI-3884"}],"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."}