{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.677","julian_year":2026.677,"time":"2026-09-05T04:54:45.881Z","years_from_j2000":26.677,"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-10647-b","name":"HD 10647 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":56.541491171841486,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":25.6233526,"dec_deg":-53.7412852,"epoch_ra_deg":25.881934,"epoch_dec_deg":-53.605615,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 10647","semi_major_axis_km":301439709.4605,"periapsis_km":null,"mass_kg":1.7841851505026745e+27,"mass_msun":0.000897292,"constellation":"Eridanus","discovered":"2006","featured":false,"url":"https://spacecatalog.org/object/hd-10647-b","radius_km":88017.78000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 10647","host_v_mag":5.52,"eccentricity":0.15,"uncertainties":{"mass_kg":[1.5187222887793477e+26,1.5187222887793477e+26],"distance_ly":[0.07273287223083379,0.07273287223083379],"eccentricity":[0.08,0.08],"host_mass_solar":[0.02,0.02],"host_radius_solar":[0.02,0.02],"host_temperature_k":[20,20],"semi_major_axis_km":[1645576.5776999998,1645576.5776999998],"orbital_period_days":[8.1,8.1],"argument_of_periastron_deg":[39,39]},"host_mass_solar":1.11,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.1,"planets_in_system":1,"discovery_facility":"W. M. Keck Observatory","host_spectral_type":"F9 V","host_temperature_k":6218,"orbital_period_days":989.2,"periastron_epoch_bjd":2453654,"transit_midpoint_bjd":2452357,"equilibrium_temperature_k":221.54,"argument_of_periastron_deg":212},"designations":[{"catalog":"Exoplanet","designation":"HD 10647 b"},{"catalog":"Host star","designation":"HD 10647"}],"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."}