{"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":"2026-09-04T01:45:10.879Z","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-1691-b","name":"Kepler-1691 b","class":"super_earth","category":"exoplanet","object_type":"Super-Earth","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":4134.586553401841,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":286.2543962,"dec_deg":41.0218373,"epoch_ra_deg":286.473031,"epoch_dec_deg":41.061758,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-1691","semi_major_axis_km":7405094.59965,"periapsis_km":null,"mass_kg":2.4008114828521342e+25,"mass_msun":0.000012074,"constellation":"Lyra","discovered":"2020","featured":false,"url":"https://spacecatalog.org/object/kepler-1691-b","radius_km":11701.962894285001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-1691","host_v_mag":14.893,"eccentricity":0,"uncertainties":{"distance_ly":[101.3041709188205,106.39221041120169],"host_temperature_k":[122,122]},"host_mass_solar":1.11,"inclination_deg":88.47,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.13152,"planets_in_system":1,"discovery_facility":"Kepler","host_temperature_k":6000,"orbital_period_days":3.8482,"transit_midpoint_bjd":2454964.9203,"equilibrium_temperature_k":1283},"designations":[{"catalog":"Exoplanet","designation":"Kepler-1691 b"},{"catalog":"Host star","designation":"Kepler-1691"}],"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."}