{"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":"2026-09-08T17:17:24.239Z","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-1898-b","name":"TOI-1898 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":259.8429153121306,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":144.5553,"dec_deg":23.5467464,"epoch_ra_deg":144.937944,"epoch_dec_deg":23.425919,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-1898","semi_major_axis_km":40241827.2183,"periapsis_km":null,"mass_kg":7.704096549450879e+26,"mass_msun":0.00038745,"constellation":"Leo","discovered":"2024","featured":false,"url":"https://spacecatalog.org/object/toi-1898-b","radius_km":59925.644626411005,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-1898","host_v_mag":7.87,"eccentricity":0.485,"uncertainties":{"mass_kg":[4.777734294233103e+25,4.180517507453966e+25],"radius_km":[1971.718244061,1494.33461615],"distance_ly":[1.4275864652661858,1.4425896586411562],"eccentricity":[0.039,0.039],"host_mass_solar":[0.0375,0.0261],"inclination_deg":[0.089,0.113],"host_radius_solar":[0.0312,0.0292],"host_temperature_k":[85,88],"semi_major_axis_km":[747989.3535,747989.3535],"orbital_period_days":[0.000061,0.000061],"argument_of_periastron_deg":[5,5]},"host_mass_solar":1.2484,"inclination_deg":87.531,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.6131,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_temperature_k":6241,"orbital_period_days":45.52234,"transit_midpoint_bjd":2458894.2511,"equilibrium_temperature_k":674.54,"argument_of_periastron_deg":70.99},"designations":[{"catalog":"Exoplanet","designation":"TOI-1898 b"},{"catalog":"Host star","designation":"TOI-1898"}],"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."}