{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.680","julian_year":2026.68,"time":"2026-09-06T09:04:49.577Z","years_from_j2000":26.68,"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-9779-b","name":"LTT 9779 b","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":262.35138401315004,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":358.6688767,"dec_deg":-37.6282237,"epoch_ra_deg":359.01716,"epoch_dec_deg":-37.478745,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"LTT 9779","semi_major_axis_km":2511748.2490529995,"periapsis_km":null,"mass_kg":1.7510396188364325e+26,"mass_msun":0.0000880623,"constellation":"Sculptor","discovered":"2020","featured":false,"url":"https://spacecatalog.org/object/ltt-9779-b","radius_km":30104.632,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"LTT 9779","host_v_mag":9.79,"eccentricity":0,"uncertainties":{"mass_kg":[4.837455972911017e+24,4.658290936877276e+24],"radius_km":[1466.9630000000002,1466.9630000000002],"distance_ly":[1.0273925898077418,1.0352203428729436],"host_mass_solar":[0.03,0.02],"inclination_deg":[0.43,0.43],"host_radius_solar":[0.006,0.006],"host_temperature_k":[13,14],"semi_major_axis_km":[17951.744484,20943.701897999996],"orbital_period_days":[0.0000093,0.0000093]},"host_mass_solar":1.02,"inclination_deg":76.39,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.949,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_spectral_type":"G7 V","host_temperature_k":5443,"orbital_period_days":0.792052,"transit_midpoint_bjd":2458354.2143,"equilibrium_temperature_k":1978,"argument_of_periastron_deg":90},"designations":[{"catalog":"Exoplanet","designation":"LTT 9779 b"},{"catalog":"Host star","designation":"LTT 9779"}],"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."}