{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.683","julian_year":2026.683,"time":"2026-09-07T10:04:27.602Z","years_from_j2000":26.683,"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":"k2-225-b","name":"K2-225 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":1166.9157650674103,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":186.5410958,"dec_deg":-9.6248232,"epoch_ra_deg":186.887946,"epoch_dec_deg":-9.773644,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"K2-225","semi_major_axis_km":21078339.981629997,"periapsis_km":null,"mass_kg":7.584653192095051e+25,"mass_msun":0.0000381443,"constellation":"Virgo","discovered":"2018","featured":false,"url":"https://spacecatalog.org/object/k2-225-b","radius_km":23020.423965799,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"K2-225","host_v_mag":11.836,"eccentricity":0.23,"uncertainties":{"radius_km":[1429.8399705410002,1787.300011012],"distance_ly":[18.62679073140322,19.23018003017919],"eccentricity":[0.16,0.39],"host_mass_solar":[0.096,0.11],"inclination_deg":[0.6,0.85],"host_radius_solar":[0.087,0.094],"host_temperature_k":[140,140],"semi_major_axis_km":[463753.39916999993,493672.97331],"orbital_period_days":[0.0019,0.0021],"argument_of_periastron_deg":[120,130]},"host_mass_solar":1.482,"inclination_deg":88.64,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.7,"planets_in_system":1,"discovery_facility":"K2","host_temperature_k":5520,"orbital_period_days":15.8723,"transit_midpoint_bjd":2457619.1111,"equilibrium_temperature_k":923,"argument_of_periastron_deg":-160},"designations":[{"catalog":"Exoplanet","designation":"K2-225 b"},{"catalog":"Host star","designation":"K2-225"}],"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."}