{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.672","julian_year":2026.672,"time":"2026-09-03T14:31:19.647Z","years_from_j2000":26.672,"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-951-b","name":"Kepler-951 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":1247.577498840538,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":287.7375794,"dec_deg":38.1146488,"epoch_ra_deg":287.969363,"epoch_dec_deg":38.158296,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-951","semi_major_axis_km":46240701.83336999,"periapsis_km":null,"mass_kg":1.594568820700298e+26,"mass_msun":0.0000801932,"constellation":"Lyra","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/kepler-951-b","radius_km":35653.579,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-951","host_v_mag":14.841,"eccentricity":0,"uncertainties":{"radius_km":[1658.306,1530.7440000000001],"distance_ly":[11.10888622503228,11.307841615439495],"host_mass_solar":[0.039,0.036],"host_radius_solar":[0.034,0.029],"host_temperature_k":[91.65,86.05],"orbital_period_days":[0.00008419,0.00008419]},"host_mass_solar":0.77,"inclination_deg":89.96,"stars_in_system":2,"discovery_method":"Transit","host_radius_solar":0.73,"planets_in_system":1,"discovery_facility":"Kepler","host_temperature_k":4834,"orbital_period_days":71.52530845,"transit_midpoint_bjd":2455024.692545,"equilibrium_temperature_k":340},"designations":[{"catalog":"Exoplanet","designation":"Kepler-951 b"},{"catalog":"Host star","designation":"Kepler-951"}],"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."}