{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.684","julian_year":2026.684,"time":"2026-09-07T15:50:36.539Z","years_from_j2000":26.684,"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":"hd-26161-b","name":"HD 26161 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":133.4397065024958,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":62.4122255,"dec_deg":31.6524346,"epoch_ra_deg":62.837834,"epoch_dec_deg":31.72326,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 26161","semi_major_axis_km":1508993721.7508998,"periapsis_km":null,"mass_kg":5.402062610907627e+28,"mass_msun":0.0271678,"constellation":"Perseus","discovered":"2021","featured":false,"url":"https://spacecatalog.org/object/hd-26161-b","radius_km":75899.39,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 26161","host_v_mag":6.89333,"eccentricity":0.922,"uncertainties":{"mass_kg":[4.213836611221033e+26,3.8055500100504574e+28],"distance_ly":[0.24820500344244176,0.24918347257559195],"eccentricity":[0.099,0.037],"host_mass_solar":[0.146,0.146],"inclination_deg":[30.662,50.85],"host_radius_solar":[0.031574,0.031574],"host_temperature_k":[87.6,87.6],"semi_major_axis_km":[162313689.70949998,839992043.9805],"orbital_period_days":[1387.88781,10474.0807],"argument_of_periastron_deg":[11.818,5.03]},"host_mass_solar":1.12,"inclination_deg":59.558,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.455981,"planets_in_system":1,"discovery_facility":"Multiple Observatories","host_temperature_k":6057.62,"orbital_period_days":10942.29013,"periastron_epoch_bjd":2448488.814,"transit_midpoint_bjd":2460540,"equilibrium_temperature_k":110.98,"argument_of_periastron_deg":8.508},"designations":[{"catalog":"Exoplanet","designation":"HD 26161 b"},{"catalog":"Host star","designation":"HD 26161"}],"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."}