{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.664","julian_year":2026.664,"time":"2026-08-31T13:10:20.711Z","years_from_j2000":26.664,"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-655-b","name":"Kepler-655 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":2454.5289592726785,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":297.2590664,"dec_deg":46.843165,"epoch_ra_deg":297.460166,"epoch_dec_deg":46.909787,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-655","semi_major_axis_km":38442164.83377899,"periapsis_km":null,"mass_kg":4.658290936877275e+25,"mass_msun":0.0000234272,"constellation":"Cygnus","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/kepler-655-b","radius_km":17284.651,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-655","host_v_mag":13.568,"eccentricity":0,"uncertainties":{"radius_km":[1722.0870000000002,2615.021],"distance_ly":[29.68838428166657,29.68838428166657],"host_mass_solar":[0.051,0.06],"host_radius_solar":[0.121,0.184],"host_temperature_k":[62.57,72.99],"semi_major_axis_km":[388954.46381999995,388954.46381999995],"orbital_period_days":[0.0001651,0.0001651]},"host_mass_solar":1.15,"inclination_deg":89.98,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.24,"planets_in_system":1,"discovery_facility":"Kepler","host_temperature_k":6170,"orbital_period_days":46.4063358,"transit_midpoint_bjd":2455025.99547,"equilibrium_temperature_k":588},"designations":[{"catalog":"Exoplanet","designation":"Kepler-655 b"},{"catalog":"Host star","designation":"Kepler-655"}],"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."}