{"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":"2026-09-05T05:06:14.616Z","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":"k2-216-b","name":"K2-216 b","class":"super_earth","category":"exoplanet","object_type":"Super-Earth","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":376.5834152755291,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":11.4802354,"dec_deg":6.3470302,"epoch_ra_deg":11.827519,"epoch_dec_deg":6.493938,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"K2-216","semi_major_axis_km":4188740.3795999996,"periapsis_km":null,"mass_kg":4.777734294233103e+25,"mass_msun":0.0000240279,"constellation":"Pisces","discovered":"2018","featured":false,"url":"https://spacecatalog.org/object/k2-216-b","radius_km":11161.675000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"K2-216","host_v_mag":12.403,"eccentricity":0,"uncertainties":{"mass_kg":[9.555468588466207e+24,9.555468588466207e+24],"radius_km":[637.8100000000001,1084.277],"distance_ly":[2.286356207794371,2.315710281788878],"host_mass_solar":[0.03,0.03],"inclination_deg":[4,2.2],"host_radius_solar":[0.03,0.03],"host_temperature_k":[69,69],"semi_major_axis_km":[1047185.0948999999,448793.61209999997],"orbital_period_days":[0.00005,0.00005]},"host_mass_solar":0.7,"inclination_deg":86.9,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.72,"planets_in_system":1,"discovery_facility":"K2","host_spectral_type":"K5 V","host_temperature_k":4503,"orbital_period_days":2.1748,"transit_midpoint_bjd":2457394.0417,"equilibrium_temperature_k":1103},"designations":[{"catalog":"Exoplanet","designation":"K2-216 b"},{"catalog":"Host star","designation":"K2-216"}],"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."}