{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T18:28:14.210Z","years_from_j2000":26.681,"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-2018-b","name":"TOI-2018 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":91.30943488006862,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":229.8374423,"dec_deg":29.2078771,"epoch_ra_deg":230.118581,"epoch_dec_deg":29.109938,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-2018","semi_major_axis_km":null,"periapsis_km":null,"mass_kg":5.494394438368069e+25,"mass_msun":0.0000276321,"constellation":"Corona Borealis","discovered":"2023","featured":false,"url":"https://spacecatalog.org/object/toi-2018-b","radius_km":14465.530799999999,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-2018","host_v_mag":10.25,"eccentricity":0,"uncertainties":{"mass_kg":[1.2541552522361896e+25,1.2541552522361896e+25],"radius_km":[440.0889000000001,440.0889000000001],"distance_ly":[0.06947130845366635,0.06979746483138309],"host_mass_solar":[0.02,0.02],"inclination_deg":[0.22,0.22],"host_radius_solar":[0.01,0.01],"host_temperature_k":[42,34],"orbital_period_days":[0.000022,0.000022]},"host_mass_solar":0.57,"inclination_deg":88.52,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.62,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_spectral_type":"K V","host_temperature_k":4174,"orbital_period_days":7.435583,"transit_midpoint_bjd":2458958.258,"equilibrium_temperature_k":576.34},"designations":[{"catalog":"Exoplanet","designation":"TOI-2018 b"},{"catalog":"Host star","designation":"TOI-2018"}],"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."}