{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.672","julian_year":2026.672,"time":"2026-09-03T14:23:11.431Z","years_from_j2000":26.672,"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":"k2-5-c","name":"K2-5 c","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":661.9115376296907,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":169.3034598,"dec_deg":-1.8778254,"epoch_ra_deg":169.646507,"epoch_dec_deg":-2.024383,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"K2-5","semi_major_axis_km":12237105.823259998,"periapsis_km":null,"mass_kg":3.4220521882444606e+25,"mass_msun":0.00001721,"constellation":"Leo","discovered":"2015","featured":false,"url":"https://spacecatalog.org/object/k2-5-c","radius_km":14414.506,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"K2-5","host_v_mag":14.974,"uncertainties":{"radius_km":[3954.422,3954.422],"distance_ly":[5.3457030307774245,5.430503688983778],"host_mass_solar":[0.13,0.13],"inclination_deg":[2.47,2.47],"host_radius_solar":[0.12,0.12],"host_temperature_k":[375,375],"semi_major_axis_km":[882627.4371299999,882627.4371299999],"orbital_period_days":[0.00134,0.00134]},"host_mass_solar":0.61,"inclination_deg":86.95,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.57,"planets_in_system":2,"discovery_facility":"K2","host_spectral_type":"K7.5 V","host_temperature_k":3930,"orbital_period_days":10.93241,"transit_midpoint_bjd":2456814.601,"equilibrium_temperature_k":456},"designations":[{"catalog":"Exoplanet","designation":"K2-5 c"}],"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."}