{"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":"2026-09-08T17:24:04.395Z","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-1839-c","name":"TOI-1839 c","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":378.62189263625874,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":196.8331106,"dec_deg":5.8520458,"epoch_ra_deg":197.173208,"epoch_dec_deg":5.708308,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-1839","semi_major_axis_km":null,"periapsis_km":null,"mass_kg":3.816215267518691e+25,"mass_msun":0.0000191923,"constellation":"Virgo","discovered":"2026","featured":false,"url":"https://spacecatalog.org/object/toi-1839-c","radius_km":15362.753817126,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-1839","host_v_mag":10.9,"uncertainties":{"radius_km":[1715.2508248580002,2719.551872243],"distance_ly":[1.8362604065452652,1.849306661653935],"host_mass_solar":[0.133653,0.115539],"inclination_deg":[4.47222,2.171],"orbital_period_days":[0.00003772055,0.00003823532]},"host_mass_solar":0.934,"inclination_deg":86.8958,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.848099,"planets_in_system":2,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_temperature_k":5315.91,"orbital_period_days":4.02393854207,"transit_midpoint_bjd":2459690.23538058},"designations":[{"catalog":"Exoplanet","designation":"TOI-1839 c"}],"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."}