{"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":"2026-09-08T09:15:31.930Z","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-4311-c","name":"TOI-4311 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":440.2719711522776,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":41.6855224,"dec_deg":-31.1793201,"epoch_ra_deg":41.970617,"epoch_dec_deg":-31.066308,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-4311","semi_major_axis_km":16695122.37012,"periapsis_km":null,"mass_kg":8.110203964460693e+25,"mass_msun":0.0000407874,"constellation":"Fornax","discovered":"2026","featured":false,"url":"https://spacecatalog.org/object/toi-4311-c","radius_km":15753.907000000003,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-4311","host_v_mag":11.388,"uncertainties":{"radius_km":[701.591,765.3720000000001],"distance_ly":[3.0006386749940397,3.039777440320049],"host_mass_solar":[0.049,0.047],"inclination_deg":[0.21,0.24],"host_radius_solar":[0.0062,0.0062],"host_temperature_k":[66,66],"semi_major_axis_km":[344075.10260999994,329115.31554],"orbital_period_days":[0.000075,0.000081]},"host_mass_solar":0.816,"inclination_deg":89.05,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.8441,"planets_in_system":2,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_spectral_type":"K","host_temperature_k":5063,"orbital_period_days":15.070425,"transit_midpoint_bjd":2458394.7242,"eccentricity_upper_limit":0.22,"equilibrium_temperature_k":671},"designations":[{"catalog":"Exoplanet","designation":"TOI-4311 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."}