{"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":"2026-09-04T07:18:44.245Z","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":"k2-167-b","name":"K2-167 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":263.8585526345791,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":336.5761233,"dec_deg":-18.011665,"epoch_ra_deg":336.939998,"epoch_dec_deg":-17.875195,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"K2-167","semi_major_axis_km":13942521.54924,"periapsis_km":null,"mass_kg":3.881909114064396e+25,"mass_msun":0.0000195227,"constellation":"Aquarius","discovered":"2018","featured":false,"url":"https://spacecatalog.org/object/k2-167-b","radius_km":15084.811973033002,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"K2-167","host_v_mag":8.24,"eccentricity":0.48,"uncertainties":{"mass_kg":[8.958251801687069e+24,9.555468588466207e+24],"radius_km":[929.3960031750001,1358.347975203],"distance_ly":[1.525433378581209,1.5430458229779132],"eccentricity":[0.26,0.26],"host_mass_solar":[0.097,0.1],"inclination_deg":[1.1,1.6],"host_radius_solar":[0.071,0.077],"host_temperature_k":[170,170],"semi_major_axis_km":[433833.82502999995,418874.03796],"orbital_period_days":[0.000019,0.000023],"argument_of_periastron_deg":[100,120]},"host_mass_solar":1.084,"inclination_deg":86.8,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.499,"planets_in_system":1,"discovery_facility":"K2","host_spectral_type":"F7 V","host_temperature_k":6310,"orbital_period_days":9.978541,"transit_midpoint_bjd":2457299.2465,"equilibrium_temperature_k":1220,"argument_of_periastron_deg":140},"designations":[{"catalog":"Exoplanet","designation":"K2-167 b"},{"catalog":"Host star","designation":"K2-167"}],"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."}