{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.654","julian_year":2026.654,"time":"2026-08-27T22:30:20.394Z","years_from_j2000":26.654,"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":"k2-286-b","name":"K2-286 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":248.36351544201207,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":233.3698192,"dec_deg":-16.7737113,"epoch_ra_deg":233.749692,"epoch_dec_deg":-16.864341,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"K2-286","semi_major_axis_km":26448903.53976,"periapsis_km":null,"mass_kg":3.0219169411024377e+25,"mass_msun":0.0000151977,"constellation":"Libra","discovered":"2018","featured":false,"url":"https://spacecatalog.org/object/k2-286-b","radius_km":13394.010000000002,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"K2-286","host_v_mag":12.881,"uncertainties":{"radius_km":[1275.6200000000001,1275.6200000000001],"distance_ly":[0.766467487634347,0.7710336769223815],"host_mass_solar":[0.02,0.02],"inclination_deg":[0.25,0.21],"host_radius_solar":[0.02,0.02],"host_temperature_k":[100,100],"semi_major_axis_km":[3066756.34935,2617962.7372500002],"orbital_period_days":[0.005,0.005]},"host_mass_solar":0.64,"inclination_deg":89.67,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.62,"planets_in_system":1,"discovery_facility":"K2","host_spectral_type":"M0 V","host_temperature_k":3926,"orbital_period_days":27.359,"transit_midpoint_bjd":2458010.417,"equilibrium_temperature_k":347},"designations":[{"catalog":"Exoplanet","designation":"K2-286 b"},{"catalog":"Host star","designation":"K2-286"}],"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":"2026-08-27T19:16:43.430Z","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."}