{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.667","julian_year":2026.667,"time":"2026-09-01T16:54:23.278Z","years_from_j2000":26.667,"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-150-d","name":"Kepler-150 d","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":2906.353389323683,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":288.2341025,"dec_deg":40.520897,"epoch_ra_deg":288.456116,"epoch_dec_deg":40.565743,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-150","semi_major_axis_km":15558178.552799998,"periapsis_km":null,"mass_kg":4.8971776515889305e+25,"mass_msun":0.0000246286,"constellation":"Lyra","discovered":"2014","featured":false,"url":"https://spacecatalog.org/object/kepler-150-d","radius_km":17794.899,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-150","host_v_mag":15.161,"eccentricity":0,"uncertainties":{"radius_km":[2615.021,2615.021],"distance_ly":[53.50269220065459,55.5150770511669],"host_mass_solar":[0.021,0.018],"host_radius_solar":[0.136,0.136],"host_temperature_k":[100,100],"orbital_period_days":[0.000036,0.000036]},"host_mass_solar":0.956,"inclination_deg":89.95,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.939,"planets_in_system":5,"discovery_facility":"Kepler","host_temperature_k":5560,"orbital_period_days":12.56093,"transit_midpoint_bjd":2454999.79588,"equilibrium_temperature_k":734},"designations":[{"catalog":"Exoplanet","designation":"Kepler-150 d"}],"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."}