{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.669","julian_year":2026.669,"time":"2026-09-02T06:18:30.387Z","years_from_j2000":26.669,"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":"k2-271-b","name":"K2-271 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1841.0027202772667,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":125.2239144,"dec_deg":16.0907958,"epoch_ra_deg":125.603344,"epoch_dec_deg":16.006062,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"K2-271","semi_major_axis_km":11519036.043899998,"periapsis_km":null,"mass_kg":2.4963661687367963e+26,"mass_msun":0.000125546,"constellation":"Cancer","discovered":"2018","featured":false,"url":"https://spacecatalog.org/object/k2-271-b","radius_km":46432.56800000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"K2-271","host_v_mag":13.845,"uncertainties":{"radius_km":[1466.9630000000002,1466.9630000000002],"distance_ly":[44.68342374719385,44.68342374719385],"host_mass_solar":[0.03,0.03],"host_radius_solar":[0.03,0.03],"host_temperature_k":[71,71],"semi_major_axis_km":[134638.08362999998,119678.29656],"orbital_period_days":[0.000127,0.000127]},"host_mass_solar":0.83,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.99,"planets_in_system":1,"discovery_facility":"K2","host_temperature_k":5644,"orbital_period_days":8.562421,"transit_midpoint_bjd":2457149.71271,"equilibrium_temperature_k":893},"designations":[{"catalog":"Exoplanet","designation":"K2-271 b"},{"catalog":"Host star","designation":"K2-271"}],"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":"2026-09-01T22:58:55.274Z","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."}