{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.687","julian_year":2026.687,"time":"2026-09-08T19:39:23.797Z","years_from_j2000":26.687,"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-1739-b","name":"TOI-1739 b","class":"super_earth","category":"exoplanet","object_type":"Super-Earth","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":231.5119938745211,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":240.172481,"dec_deg":83.2586589,"epoch_ra_deg":239.438966,"epoch_dec_deg":83.181413,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-1739","semi_major_axis_km":11051093.904350398,"periapsis_km":null,"mass_kg":2.6576147011671636e+25,"mass_msun":0.0000133655,"constellation":"Ursa Minor","discovered":"2024","featured":false,"url":"https://spacecatalog.org/object/toi-1739-b","radius_km":12411.7826,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-1739","host_v_mag":10.692,"uncertainties":{"radius_km":[1077.8989000000001,1441.4506000000001],"distance_ly":[0.335614912670529,0.3365933818036792],"host_mass_solar":[0.09,0.09],"inclination_deg":[0.7,0.47],"host_radius_solar":[0.054,0.054],"host_temperature_k":[125,125],"semi_major_axis_km":[468989.3246445,430841.867616],"orbital_period_days":[0.000010106,0.000009161]},"host_mass_solar":0.78,"inclination_deg":89.27,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.781,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_temperature_k":4814,"orbital_period_days":8.303341406,"transit_midpoint_bjd":2459631.82035,"equilibrium_temperature_k":755.55},"designations":[{"catalog":"Exoplanet","designation":"TOI-1739 b"},{"catalog":"Host star","designation":"TOI-1739"}],"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."}