{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.674","julian_year":2026.674,"time":"2026-09-04T01:17:44.086Z","years_from_j2000":26.674,"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":"kepler-444-c","name":"Kepler-444 c","class":"terrestrial_planet","category":"exoplanet","object_type":"Terrestrial planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":118.85007941447043,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":289.7528323,"dec_deg":41.631884,"epoch_ra_deg":289.971131,"epoch_dec_deg":41.680522,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-444","semi_major_axis_km":7301872.068866999,"periapsis_km":null,"mass_kg":4.7359291191585636e+23,"mass_msun":2.38177e-7,"constellation":"Lyra","discovered":"2015","featured":false,"url":"https://spacecatalog.org/object/kepler-444-c","radius_km":3169.9157,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-444","host_v_mag":8.87,"eccentricity":0.31,"uncertainties":{"radius_km":[108.42770000000002,133.94010000000003],"distance_ly":[0.1285056128203969,0.12883176919811365],"eccentricity":[0.15,0.12],"host_mass_solar":[0.043,0.043],"inclination_deg":[1,1.2],"host_radius_solar":[0.014,0.014],"host_temperature_k":[74,74],"semi_major_axis_km":[139126.01975099999,139126.01975099999],"orbital_period_days":[0.0000071,0.000007]},"host_mass_solar":0.758,"inclination_deg":88.2,"stars_in_system":3,"discovery_method":"Transit","host_radius_solar":0.752,"planets_in_system":5,"discovery_facility":"Kepler","host_spectral_type":"K","host_temperature_k":5046,"orbital_period_days":4.5458841,"transit_midpoint_bjd":2454964.522,"equilibrium_temperature_k":868},"designations":[{"catalog":"Exoplanet","designation":"Kepler-444 c"},{"catalog":"Host star","designation":"Kepler-444"}],"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."}