{"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":"2026-09-07T15:44:28.307Z","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":"tic-434398831-b","name":"TIC 434398831 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":707.795216846882,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":93.9592639,"dec_deg":16.0238459,"epoch_ra_deg":94.346408,"epoch_dec_deg":16.015311,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TIC 434398831","semi_major_axis_km":6942837.179187,"periapsis_km":null,"mass_kg":7.226323120027569e+25,"mass_msun":0.0000363422,"constellation":"Orion","discovered":"2025","featured":false,"url":"https://spacecatalog.org/object/tic-434398831-b","radius_km":22387.131,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TIC 434398831","host_v_mag":11.682,"eccentricity":0.04,"uncertainties":{"radius_km":[1339.401,1403.182],"distance_ly":[6.9993158658013135,7.142824671996681],"eccentricity":[0.034,0.088],"host_mass_solar":[0.018,0.014],"inclination_deg":[1.1,1.1],"host_radius_solar":[0.048,0.048],"host_temperature_k":[50,50],"semi_major_axis_km":[25431.638018999998,25431.638018999998],"orbital_period_days":[0.000011,0.000012],"argument_of_periastron_deg":[51,110]},"host_mass_solar":0.992,"inclination_deg":88.2,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.909,"planets_in_system":2,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_spectral_type":"G4 V","host_temperature_k":5638,"orbital_period_days":3.685504,"transit_midpoint_bjd":2458468.635,"equilibrium_temperature_k":1250,"argument_of_periastron_deg":-61},"designations":[{"catalog":"Exoplanet","designation":"TIC 434398831 b"},{"catalog":"Host star","designation":"TIC 434398831"}],"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."}