{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.674","julian_year":2026.674,"time":"2026-09-04T01:32:14.839Z","years_from_j2000":26.674,"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-279-b","name":"Kepler-279 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":3383.5462624334964,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":287.391295,"dec_deg":42.194822,"epoch_ra_deg":287.605386,"epoch_dec_deg":42.237588,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-279","semi_major_axis_km":16754961.518399999,"periapsis_km":null,"mass_kg":2.4969215803485012e+28,"mass_msun":0.0125574,"constellation":"Lyra","discovered":"2014","featured":false,"url":"https://spacecatalog.org/object/kepler-279-b","radius_km":23088.722,"radius_kind":null,"data_quality":"The published mass and radius imply a density no material has. One of the two is likely an upper limit rather than a measurement.","description":null,"properties":{"host_star":"Kepler-279","host_v_mag":13.647,"eccentricity":0,"uncertainties":{"radius_km":[4528.451,4528.451],"distance_ly":[70.2866993979582,70.2866993979582],"host_mass_solar":[0.1,0.1],"host_radius_solar":[0.315,0.315],"host_temperature_k":[259,259],"orbital_period_days":[0.000051,0.000051]},"host_mass_solar":1.2,"inclination_deg":83.92,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.746,"planets_in_system":4,"discovery_facility":"Kepler","host_temperature_k":6363,"orbital_period_days":12.309681,"transit_midpoint_bjd":2454970.68644,"equilibrium_temperature_k":1104},"designations":[{"catalog":"Exoplanet","designation":"Kepler-279 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."}