{"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":"2026-09-03T07:55:49.322Z","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":"k2-90-b","name":"K2-90 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":437.6627201305436,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":59.1527391,"dec_deg":22.4724517,"epoch_ra_deg":59.549596,"epoch_dec_deg":22.550633,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"K2-90","semi_major_axis_km":14361395.587199999,"periapsis_km":null,"mass_kg":4.341766039884333e+25,"mass_msun":0.0000218354,"constellation":"Taurus","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/k2-90-b","radius_km":16583.06,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"K2-90","host_v_mag":13.707,"eccentricity":0.07,"uncertainties":{"radius_km":[637.8100000000001,637.8100000000001],"distance_ly":[1.3665952226331548,1.3731183501874897],"eccentricity":[0.061103,0.133697],"host_mass_solar":[0.018,0.022],"inclination_deg":[0.09,0.09],"host_radius_solar":[0.01,0.009],"host_temperature_k":[50,58],"semi_major_axis_km":[149597.8707,149597.8707],"orbital_period_days":[0.000099,0.000083],"argument_of_periastron_deg":[138.6208,120.0811]},"host_mass_solar":0.629,"inclination_deg":89.24,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.619,"planets_in_system":2,"discovery_facility":"K2","host_temperature_k":4484,"orbital_period_days":13.733314,"transit_midpoint_bjd":2457078.66112,"equilibrium_temperature_k":502,"argument_of_periastron_deg":16.4},"designations":[{"catalog":"Exoplanet","designation":"K2-90 b"},{"catalog":"Host star","designation":"K2-90"}],"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."}