{"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":"2026-09-05T02:16:05.213Z","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":"k2-416-b","name":"K2-416 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":392.4019995947912,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":349.2211822,"dec_deg":-5.2015032,"epoch_ra_deg":349.567984,"epoch_dec_deg":-5.054954,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"K2-416","semi_major_axis_km":13164612.621599998,"periapsis_km":null,"mass_kg":9.870247918734948e+27,"mass_msun":0.00496389,"constellation":"Aquarius","discovered":"2023","featured":false,"url":"https://spacecatalog.org/object/k2-416-b","radius_km":16965.746000000003,"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":"K2-416","host_v_mag":14.794,"uncertainties":{"radius_km":[892.9340000000001,1211.8390000000002],"distance_ly":[1.953676702523293,1.9732460851862976],"host_mass_solar":[0.012,0.012],"inclination_deg":[0.86,0.53],"host_radius_solar":[0.017,0.017],"host_temperature_k":[72,72],"semi_major_axis_km":[3141555.2846999997,1495978.707],"orbital_period_days":[0.0024,0.0026]},"host_mass_solar":0.548,"inclination_deg":89.25,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.554,"planets_in_system":1,"discovery_facility":"K2","host_spectral_type":"M V","host_temperature_k":3746,"orbital_period_days":13.102,"transit_midpoint_bjd":2458371.8384,"equilibrium_temperature_k":447},"designations":[{"catalog":"Exoplanet","designation":"K2-416 b"},{"catalog":"Host star","designation":"K2-416"}],"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."}