{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.668","julian_year":2026.668,"time":"2026-09-01T21:21:03.125Z","years_from_j2000":26.668,"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":"k2-7-b","name":"K2-7 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":2408.83771231834,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":167.0937488,"dec_deg":-1.065855,"epoch_ra_deg":167.437042,"epoch_dec_deg":-1.211134,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"K2-7","semi_major_axis_km":27929922.459689997,"periapsis_km":null,"mass_kg":9.13741683772081e+25,"mass_msun":0.0000459534,"constellation":"Leo","discovered":"2015","featured":false,"url":"https://spacecatalog.org/object/k2-7-b","radius_km":25737.119916205003,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"K2-7","host_v_mag":13.453,"eccentricity":0.24,"uncertainties":{"radius_km":[1644.3160203360003,1930.284001688],"distance_ly":[49.29201336433143,51.35332167150125],"eccentricity":[0.17,0.4],"host_mass_solar":[0.068,0.098],"inclination_deg":[0.47,0.58],"host_radius_solar":[0.074,0.082],"host_temperature_k":[140,140],"semi_major_axis_km":[613351.26987,837748.07592],"orbital_period_days":[0.0051,0.0046],"argument_of_periastron_deg":[130,110]},"host_mass_solar":1.056,"inclination_deg":89.08,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.533,"planets_in_system":1,"discovery_facility":"K2","host_temperature_k":5700,"orbital_period_days":28.6781,"transit_midpoint_bjd":2456853.2946,"equilibrium_temperature_k":786,"argument_of_periastron_deg":-30},"designations":[{"catalog":"Exoplanet","designation":"K2-7 b"},{"catalog":"Host star","designation":"K2-7"}],"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."}