{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.666","julian_year":2026.666,"time":"2026-09-01T10:31:15.066Z","years_from_j2000":26.666,"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":"k2-187-e","name":"K2-187 e","class":"super_earth","category":"exoplanet","object_type":"Super-Earth","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1079.3036388851385,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":132.5235618,"dec_deg":23.1924709,"epoch_ra_deg":132.915149,"epoch_dec_deg":23.092777,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"K2-187","semi_major_axis_km":16545524.499419998,"periapsis_km":null,"mass_kg":2.5501156795469186e+25,"mass_msun":0.0000128249,"constellation":"Cancer","discovered":"2018","featured":false,"url":"https://spacecatalog.org/object/k2-187-e","radius_km":12118.39,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"K2-187","host_v_mag":13.102,"uncertainties":{"radius_km":[1913.43,1913.43],"distance_ly":[18.065801761730416,18.678975751837896],"host_mass_solar":[0.024169,0.025227],"inclination_deg":[2,1],"host_radius_solar":[0.11,0.11],"host_temperature_k":[63,63],"semi_major_axis_km":[194477.23190999997,194477.23190999997],"orbital_period_days":[0.0000036,0.0000036]},"host_mass_solar":0.966999,"inclination_deg":90.1,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.83,"planets_in_system":4,"discovery_facility":"K2","host_temperature_k":5438,"orbital_period_days":13.606629,"transit_midpoint_bjd":2457155.08495,"equilibrium_temperature_k":698},"designations":[{"catalog":"Exoplanet","designation":"K2-187 e"}],"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":"2026-08-30T09:56:50.739Z","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."}