{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.682","julian_year":2026.682,"time":"2026-09-07T03:00:00.236Z","years_from_j2000":26.682,"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-163607-b","name":"HD 163607 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":221.0867314171831,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":268.4181383,"dec_deg":56.3924701,"epoch_ra_deg":268.537514,"epoch_dec_deg":56.3862,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 163607","semi_major_axis_km":54154429.193399996,"periapsis_km":null,"mass_kg":1.487377891276017e+27,"mass_msun":0.000748024,"constellation":"Draco","discovered":"2012","featured":false,"url":"https://spacecatalog.org/object/hd-163607-b","radius_km":88655.59000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 163607","host_v_mag":8,"eccentricity":0.7441,"uncertainties":{"mass_kg":[1.8601714311517314e+25,1.8601714311517314e+25],"distance_ly":[0.5322872084337253,0.5345703030777424],"eccentricity":[0.0071,0.0071],"semi_major_axis_km":[2393565.9312,2393565.9312],"orbital_period_days":[0.0094,0.0094],"argument_of_periastron_deg":[1.3,1.3]},"host_mass_solar":1.12,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.76,"planets_in_system":2,"discovery_facility":"W. M. Keck Observatory","host_spectral_type":"G5","host_temperature_k":5522,"orbital_period_days":75.2203,"periastron_epoch_bjd":2454185.93,"equilibrium_temperature_k":587.13,"argument_of_periastron_deg":79.6},"designations":[{"catalog":"Exoplanet","designation":"HD 163607 b"},{"catalog":"Host star","designation":"HD 163607"}],"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."}