{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.686","julian_year":2026.686,"time":"2026-09-08T13:38:56.864Z","years_from_j2000":26.686,"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":"epic-220674823-c","name":"EPIC 220674823 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":797.7458842573827,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":13.0800239,"dec_deg":10.7947051,"epoch_ra_deg":13.430474,"epoch_dec_deg":10.940848,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"EPIC 220674823","semi_major_axis_km":16126650.46146,"periapsis_km":null,"mass_kg":4.71801261555519e+25,"mass_msun":0.0000237276,"constellation":"Pisces","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/epic-220674823-c","radius_km":17297.4072,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"EPIC 220674823","host_v_mag":12.101,"eccentricity":0.18,"uncertainties":{"mass_kg":[1.2541552522361896e+25,1.2541552522361896e+25],"radius_km":[452.8451,452.8451],"distance_ly":[9.693367545741614,9.92820013769767],"eccentricity":[0.048,0.038],"host_mass_solar":[0.024,0.024],"inclination_deg":[0.4,0.44],"host_radius_solar":[0.012,0.012],"host_temperature_k":[46,46],"semi_major_axis_km":[179517.44483999998,164557.65777],"orbital_period_days":[0.000021,0.000021],"argument_of_periastron_deg":[74,58]},"host_mass_solar":0.913,"inclination_deg":89.34,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.99,"planets_in_system":2,"discovery_facility":"K2","host_spectral_type":"G5 V","host_temperature_k":5578,"orbital_period_days":13.340603,"transit_midpoint_bjd":2459473.5249,"equilibrium_temperature_k":838,"argument_of_periastron_deg":178},"designations":[{"catalog":"Exoplanet","designation":"EPIC 220674823 c"},{"catalog":"Host star","designation":"EPIC 220674823"}],"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."}