{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.677","julian_year":2026.677,"time":"2026-09-05T04:47:09.233Z","years_from_j2000":26.677,"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":"k2-316-b","name":"K2-316 b","class":"super_earth","category":"exoplanet","object_type":"Super-Earth","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":366.880263038456,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":233.6247336,"dec_deg":-23.2594663,"epoch_ra_deg":234.020279,"epoch_dec_deg":-23.349578,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"K2-316","semi_major_axis_km":2199088.69929,"periapsis_km":null,"mass_kg":1.3915151131953915e+25,"mass_msun":0.00000699813,"constellation":"Libra","discovered":"2020","featured":false,"url":"https://spacecatalog.org/object/k2-316-b","radius_km":8482.873000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"K2-316","host_v_mag":17.14,"uncertainties":{"radius_km":[574.029,637.8100000000001],"distance_ly":[3.105008715863397,3.157193736298076],"host_mass_solar":[0.005,0.005],"inclination_deg":[3.98,2.19],"host_radius_solar":[0.003,0.003],"host_temperature_k":[3,3],"semi_major_axis_km":[463753.39916999993,149597.8707],"orbital_period_days":[0.001,0.001]},"host_mass_solar":0.408,"inclination_deg":87.02,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.379,"planets_in_system":2,"discovery_facility":"K2","host_temperature_k":3436,"orbital_period_days":1.133,"transit_midpoint_bjd":2457991.605,"equilibrium_temperature_k":841},"designations":[{"catalog":"Exoplanet","designation":"K2-316 b"}],"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."}