{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T20:03:57.620Z","years_from_j2000":26.681,"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":"lkca-15-b","name":"LkCa 15 b","class":"exoplanet","category":"exoplanet","object_type":"Exoplanet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":515.822834486584,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":69.8241791,"dec_deg":22.3508662,"epoch_ra_deg":70.225953,"epoch_dec_deg":22.404116,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"LkCa 15","semi_major_axis_km":2199088699.2899995,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Taurus","discovered":"2015","featured":false,"url":"https://spacecatalog.org/object/lkca-15-b","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"LkCa 15","host_v_mag":12.025,"uncertainties":{"distance_ly":[3.9269227877095907,3.988892499475772],"host_temperature_k":[130,130],"semi_major_axis_km":[314155528.46999997,314155528.46999997]},"inclination_deg":50,"stars_in_system":1,"discovery_method":"Imaging","host_radius_solar":1.60711,"planets_in_system":2,"discovery_facility":"Large Binocular Telescope Observatory","host_temperature_k":4194,"equilibrium_temperature_k":66.87},"designations":[{"catalog":"Exoplanet","designation":"LkCa 15 b"}],"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."}