{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.682","julian_year":2026.682,"time":"2026-09-06T22:25:38.096Z","years_from_j2000":26.682,"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":"koi-4777-01","name":"KOI-4777.01","class":"terrestrial_planet","category":"exoplanet","object_type":"Terrestrial planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":561.7880527982047,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":287.2621474,"dec_deg":42.0322257,"epoch_ra_deg":287.476986,"epoch_dec_deg":42.074686,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"KOI-4777","semi_major_axis_km":1196782.9656,"periapsis_km":null,"mass_kg":5.924390524849048e+26,"mass_msun":0.000297946,"constellation":"Lyra","discovered":"2022","featured":false,"url":"https://spacecatalog.org/object/koi-4777-01","radius_km":3252.831,"radius_kind":null,"data_quality":"The published mass and radius imply a density no material has. One of the two is likely an upper limit rather than a measurement.","description":null,"properties":{"host_star":"KOI-4777","host_v_mag":16.413,"eccentricity":0,"uncertainties":{"radius_km":[191.34300000000002,191.34300000000002],"distance_ly":[3.9986771908072742,4.054123775019121],"host_mass_solar":[0.02,0.02],"inclination_deg":[2,2],"host_radius_solar":[0.01,0.01],"host_temperature_k":[69,69],"semi_major_axis_km":[44879.361209999995,44879.361209999995],"orbital_period_days":[0.000001,0.000001]},"host_mass_solar":0.41,"inclination_deg":87,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.4,"planets_in_system":1,"discovery_facility":"Kepler","host_temperature_k":3515,"orbital_period_days":0.412,"transit_midpoint_bjd":2454965.219,"equilibrium_temperature_k":1180,"argument_of_periastron_deg":90},"designations":[{"catalog":"Exoplanet","designation":"KOI-4777.01"},{"catalog":"Host star","designation":"KOI-4777"}],"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."}