{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.674","julian_year":2026.674,"time":"2026-09-04T01:31:59.837Z","years_from_j2000":26.674,"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":"kepler-887-c","name":"Kepler-887 c","class":"terrestrial_planet","category":"exoplanet","object_type":"Terrestrial planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":2891.663306071321,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":290.0907893,"dec_deg":39.8169085,"epoch_ra_deg":290.317136,"epoch_dec_deg":39.86639,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-887","semi_major_axis_km":11982789.44307,"periapsis_km":null,"mass_kg":9.017973480364983e+24,"mass_msun":0.00000453527,"constellation":"Lyra","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/kepler-887-c","radius_km":7207.253,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-887","host_v_mag":13.52,"eccentricity":0,"uncertainties":{"radius_km":[701.591,1084.277],"distance_ly":[39.71606211456785,40.81847067125044],"host_mass_solar":[0.039,0.052],"host_radius_solar":[0.117,0.186],"host_temperature_k":[49.68,62.11],"semi_major_axis_km":[107710.466904,107710.466904],"orbital_period_days":[0.00004957,0.00004957]},"host_mass_solar":1.19,"inclination_deg":88.3,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.29,"planets_in_system":2,"discovery_facility":"Kepler","host_temperature_k":6194,"orbital_period_days":7.63846023,"transit_midpoint_bjd":2454971.24467,"equilibrium_temperature_k":1089},"designations":[{"catalog":"Exoplanet","designation":"Kepler-887 c"},{"catalog":"Host star","designation":"Kepler-887"}],"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."}