{"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":"2026-09-08T16:19:34.481Z","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-4342-c","name":"TOI-4342 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":200.65270819685142,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":324.3894196,"dec_deg":-77.9791468,"epoch_ra_deg":325.145769,"epoch_dec_deg":-77.858287,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-4342","semi_major_axis_km":12027668.80428,"periapsis_km":null,"mass_kg":2.866640576539862e+25,"mass_msun":0.0000144167,"constellation":"Octans","discovered":"2023","featured":false,"url":"https://spacecatalog.org/object/toi-4342-c","radius_km":14982.156900000002,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-4342","host_v_mag":12.669,"eccentricity":0,"uncertainties":{"mass_kg":[8.361035014907931e+24,8.361035014907931e+24],"radius_km":[586.7852,599.5414000000001],"distance_ly":[0.3333318180265118,0.3333318180265118],"host_mass_solar":[0.013,0.013],"inclination_deg":[0.26,0.26],"host_radius_solar":[0.018,0.018],"host_temperature_k":[92,92],"semi_major_axis_km":[46375.339917,47871.318624],"orbital_period_days":[0.00015,0.00015]},"host_mass_solar":0.587,"inclination_deg":89.61,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.598,"planets_in_system":2,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_spectral_type":"M0 V","host_temperature_k":3866,"orbital_period_days":10.688662,"transit_midpoint_bjd":2458659.3486,"equilibrium_temperature_k":514,"argument_of_periastron_deg":90},"designations":[{"catalog":"Exoplanet","designation":"TOI-4342 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."}