{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T13:30:25.750Z","years_from_j2000":26.681,"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":"hip-65891-b","name":"HIP 65891 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":490.186943198048,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":202.6050857,"dec_deg":-58.6643937,"epoch_ra_deg":203.041356,"epoch_dec_deg":-58.803133,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HIP 65891","semi_major_axis_km":421865995.37399995,"periapsis_km":null,"mass_kg":1.1578560058515996e+28,"mass_msun":0.00582302,"constellation":"Centaurus","discovered":"2015","featured":false,"url":"https://spacecatalog.org/object/hip-65891-b","radius_km":81001.87,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HIP 65891","host_v_mag":6.75,"eccentricity":0.09,"uncertainties":{"mass_kg":[2.467561979683737e+27,2.467561979683737e+27],"distance_ly":[2.1004470724958275,2.120016455158832],"eccentricity":[0.05,0.05],"host_mass_solar":[0.21,0.21],"inclination_deg":[39.9,39.8],"host_radius_solar":[1.02,1.02],"host_temperature_k":[100,100],"semi_major_axis_km":[13463808.362999998,13463808.362999998],"orbital_period_days":[22,22.8],"argument_of_periastron_deg":[18.5,24.6]},"host_mass_solar":2.5,"inclination_deg":89.9,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":8.93,"planets_in_system":1,"discovery_facility":"Multiple Observatories","host_spectral_type":"K0 III","host_temperature_k":5000,"orbital_period_days":1089.6,"periastron_epoch_bjd":2458220.9,"equilibrium_temperature_k":429.05,"argument_of_periastron_deg":363.8},"designations":[{"catalog":"Exoplanet","designation":"HIP 65891 b"},{"catalog":"Host star","designation":"HIP 65891"}],"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."}