{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.671","julian_year":2026.671,"time":"2026-09-02T22:54:19.300Z","years_from_j2000":26.671,"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":"k2-87-b","name":"K2-87 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1602.2171130232848,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":66.2363638,"dec_deg":18.8273617,"epoch_ra_deg":66.626875,"epoch_dec_deg":18.889239,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"K2-87","semi_major_axis_km":14062199.8458,"periapsis_km":null,"mass_kg":2.681503372638329e+26,"mass_msun":0.000134857,"constellation":"Taurus","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/k2-87-b","radius_km":48473.56,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"K2-87","host_v_mag":14.136,"uncertainties":{"radius_km":[2551.2400000000002,2551.2400000000002],"distance_ly":[22.377589075145764,23.007070884139083],"host_mass_solar":[0.044,0.042],"inclination_deg":[0.17,0.17],"host_radius_solar":[0.062,0.083],"host_temperature_k":[49,58],"semi_major_axis_km":[149597.8707,149597.8707],"orbital_period_days":[0.000055,0.000055]},"host_mass_solar":1.164,"inclination_deg":87.74,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.401,"planets_in_system":1,"discovery_facility":"K2","host_temperature_k":5747,"orbital_period_days":9.726618,"transit_midpoint_bjd":2457072.30232,"equilibrium_temperature_k":979},"designations":[{"catalog":"Exoplanet","designation":"K2-87 b"},{"catalog":"Host star","designation":"K2-87"}],"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."}