{"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":"2026-09-07T02:04:55.705Z","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-103774-b","name":"HD 103774 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":183.9812249498601,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":179.2310729,"dec_deg":-12.1079951,"epoch_ra_deg":179.574476,"epoch_dec_deg":-12.257534,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 103774","semi_major_axis_km":10471850.949000001,"periapsis_km":null,"mass_kg":6.927714726638e+26,"mass_msun":0.000348405,"constellation":"Corvus","discovered":"2013","featured":false,"url":"https://spacecatalog.org/object/hd-103774-b","radius_km":84828.73000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 103774","host_v_mag":7.13463,"eccentricity":0.09,"uncertainties":{"mass_kg":[4.180517507453966e+25,4.180517507453966e+25],"distance_ly":[0.5786014140695028,0.582189134224387],"eccentricity":[0.04,0.04],"host_mass_solar":[0.03,0.03],"host_radius_solar":[0.042346,0.050143],"host_temperature_k":[77,77],"semi_major_axis_km":[149597.8707,149597.8707],"orbital_period_days":[0.0005,0.0005],"argument_of_periastron_deg":[64,64]},"host_mass_solar":1.335,"stars_in_system":2,"discovery_method":"Radial Velocity","host_radius_solar":1.581047,"planets_in_system":1,"discovery_facility":"La Silla Observatory","host_spectral_type":"F5 V","host_temperature_k":6489,"orbital_period_days":5.8881,"periastron_epoch_bjd":2455675.4,"equilibrium_temperature_k":1487.08,"argument_of_periastron_deg":-42},"designations":[{"catalog":"Exoplanet","designation":"HD 103774 b"},{"catalog":"Host star","designation":"HD 103774"}],"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."}