{"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":"2026-09-03T06:40:53.041Z","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-177-b","name":"Kepler-177 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":4681.779108297222,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":286.0471442,"dec_deg":45.0532038,"epoch_ra_deg":286.246589,"epoch_dec_deg":45.092569,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-177","semi_major_axis_km":31566646.696406998,"periapsis_km":null,"mass_kg":3.4877460347901655e+25,"mass_msun":0.0000175404,"constellation":"Lyra","discovered":"2013","featured":false,"url":"https://spacecatalog.org/object/kepler-177-b","radius_km":22323.350000000002,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-177","host_v_mag":15.171,"eccentricity":0,"uncertainties":{"mass_kg":[4.897177651588931e+24,5.136064366300586e+24],"radius_km":[956.715,1211.8390000000002],"distance_ly":[129.84285396903556,137.31183501874898],"host_mass_solar":[0.023,0.025],"host_radius_solar":[0.051,0.053],"host_temperature_k":[60,60],"semi_major_axis_km":[270772.145967,270772.145967],"orbital_period_days":[0.0014,0.0015]},"host_mass_solar":0.921,"inclination_deg":89.93,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.324,"planets_in_system":2,"discovery_facility":"Kepler","host_temperature_k":5732,"orbital_period_days":36.8601,"transit_midpoint_bjd":2454971.90683,"equilibrium_temperature_k":549},"designations":[{"catalog":"Exoplanet","designation":"Kepler-177 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."}