{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.683","julian_year":2026.683,"time":"2026-09-07T06:59:25.652Z","years_from_j2000":26.683,"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-16760-b","name":"HD 16760 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":163.65095207328008,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":40.5892123,"dec_deg":38.6182163,"epoch_ra_deg":41.010297,"epoch_dec_deg":38.732947,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 16760","semi_major_axis_km":172935138.5292,"periapsis_km":null,"mass_kg":4.080967889476949e+28,"mass_msun":0.0205238,"constellation":"Perseus","discovered":"2009","featured":false,"url":"https://spacecatalog.org/object/hd-16760-b","radius_km":77175.01000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 16760","host_v_mag":8.7,"eccentricity":0.079,"uncertainties":{"mass_kg":[8.541560698905244e+27,9.490622998783604e+27],"eccentricity":[0.002,0.002],"host_mass_solar":[0.01,0.01],"inclination_deg":[28.8,32.2],"host_radius_solar":[0.005,0.005],"host_temperature_k":[11,11],"semi_major_axis_km":[598391.4828,598391.4828],"orbital_period_days":[0.08,0.08],"argument_of_periastron_deg":[1.7,1.6]},"host_mass_solar":0.93,"inclination_deg":43.3,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.835,"planets_in_system":1,"discovery_facility":"Multiple Facilities","host_spectral_type":"G5 V","host_temperature_k":5518,"orbital_period_days":466.08,"periastron_epoch_bjd":2457995,"equilibrium_temperature_k":226.14,"argument_of_periastron_deg":240.4},"designations":[{"catalog":"Exoplanet","designation":"HD 16760 b"},{"catalog":"Host star","designation":"HD 16760"}],"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."}