{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.684","julian_year":2026.684,"time":"2026-09-07T19:03:57.940Z","years_from_j2000":26.684,"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-1515-b","name":"Kepler-1515 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1759.0298378657178,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":290.9739057,"dec_deg":48.1782059,"epoch_ra_deg":291.161106,"epoch_dec_deg":48.229826,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-1515","semi_major_axis_km":112549958.02114499,"periapsis_km":null,"mass_kg":3.9535751284778934e+26,"mass_msun":0.000198831,"constellation":"Cygnus","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/kepler-1515-b","radius_km":60910.85500000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-1515","host_v_mag":12.1,"eccentricity":0,"uncertainties":{"radius_km":[4081.9840000000004,4911.137000000001],"distance_ly":[21.030563235175617,21.536105620636565],"host_mass_solar":[0.054,0.06],"host_radius_solar":[0.095,0.113],"host_temperature_k":[81.34,94.24],"semi_major_axis_km":[656734.6523729999,656734.6523729999],"orbital_period_days":[0.0001275,0.0001275]},"host_mass_solar":1.3,"inclination_deg":89.99,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.41,"planets_in_system":1,"discovery_facility":"Kepler","host_temperature_k":6511,"orbital_period_days":214.3114164,"transit_midpoint_bjd":2455169.331329,"equilibrium_temperature_k":380},"designations":[{"catalog":"Exoplanet","designation":"Kepler-1515 b"},{"catalog":"Host star","designation":"Kepler-1515"}],"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."}