{"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":"2026-09-07T18:51:37.430Z","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-128-01","name":"TOI-128.01","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":223.3280780448526,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":79.5209381,"dec_deg":-80.964384,"epoch_ra_deg":78.94537,"epoch_dec_deg":-80.934175,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-128","semi_major_axis_km":8049889.845962432,"periapsis_km":null,"mass_kg":3.3205253344920064e+25,"mass_msun":0.0000166994,"constellation":"Mensa","discovered":"2024","featured":false,"url":"https://spacecatalog.org/object/toi-128-01","radius_km":14152.876338000002,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-128","host_v_mag":8.44,"uncertainties":{"radius_km":[693.8097180000001,693.8097180000001],"distance_ly":[0.38747377672749117,0.38877840223835813]},"host_mass_solar":0.851969,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.13,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_temperature_k":6086,"orbital_period_days":4.9404681,"transit_midpoint_bjd":2460175.867159,"equilibrium_temperature_k":1344.51},"designations":[{"catalog":"Exoplanet","designation":"TOI-128.01"},{"catalog":"Host star","designation":"TOI-128"}],"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."}