{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.683","julian_year":2026.683,"time":"2026-09-07T12:54:33.525Z","years_from_j2000":26.683,"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":"ltt-1445-a-c","name":"LTT 1445 A c","class":"terrestrial_planet","category":"exoplanet","object_type":"Terrestrial planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":22.404627438858483,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":45.4624781,"dec_deg":-16.5944956,"epoch_ra_deg":45.775462,"epoch_dec_deg":-16.48823,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"LTT 1445 A","semi_major_axis_km":3980799.339327,"periapsis_km":null,"mass_kg":9.197138516398724e+24,"mass_msun":0.00000462537,"constellation":"Eridanus","discovered":"2022","featured":false,"url":"https://spacecatalog.org/object/ltt-1445-a-c","radius_km":7315.680700000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"LTT 1445 A","host_v_mag":10.59,"uncertainties":{"mass_kg":[1.134711894880362e+24,1.1944335735582758e+24],"radius_km":[344.41740000000004,350.7955],"distance_ly":[0.012410250172122087,0.012410250172122087],"host_mass_solar":[0.014,0.014],"inclination_deg":[0.29,0.18],"host_radius_solar":[0.01,0.011],"host_temperature_k":[150,150],"semi_major_axis_km":[73302.956643,70310.999229],"orbital_period_days":[0.0000036,0.0000034],"argument_of_periastron_deg":[108,136]},"host_mass_solar":0.257,"inclination_deg":87.43,"stars_in_system":3,"discovery_method":"Transit","host_radius_solar":0.265,"planets_in_system":2,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_spectral_type":"M3.0","host_temperature_k":3340,"orbital_period_days":3.1239035,"transit_midpoint_bjd":2458412.58159,"eccentricity_upper_limit":0.223,"equilibrium_temperature_k":508,"argument_of_periastron_deg":163},"designations":[{"catalog":"Exoplanet","designation":"LTT 1445 A 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."}