{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.665","julian_year":2026.665,"time":"2026-08-31T23:53:15.237Z","years_from_j2000":26.665,"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-652-b","name":"Kepler-652 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":1286.8499882814112,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":288.0080899,"dec_deg":46.4736108,"epoch_ra_deg":288.201629,"epoch_dec_deg":46.517851,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-652","semi_major_axis_km":7417062.429306,"periapsis_km":null,"mass_kg":4.037185478626972e+25,"mass_msun":0.0000203036,"constellation":"Lyra","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/kepler-652-b","radius_km":15881.469000000003,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-652","host_v_mag":13.618,"eccentricity":0,"uncertainties":{"radius_km":[318.90500000000003,382.68600000000004],"distance_ly":[6.950392409143801,7.025408376018653],"host_mass_solar":[0.017,0.019],"host_radius_solar":[0.015,0.017],"host_temperature_k":[40.88,43.22],"semi_major_axis_km":[52359.254745,52359.254745],"orbital_period_days":[0.000001716,0.000001716]},"host_mass_solar":0.97,"inclination_deg":89.94,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.88,"planets_in_system":1,"discovery_facility":"Kepler","host_temperature_k":5490,"orbital_period_days":4.182002531,"transit_midpoint_bjd":2455005.789509,"equilibrium_temperature_k":974},"designations":[{"catalog":"Exoplanet","designation":"Kepler-652 b"},{"catalog":"Host star","designation":"Kepler-652"}],"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."}