{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T20:49:35.825Z","years_from_j2000":26.681,"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-89744-b","name":"HD 89744 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":126.01508272015187,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":155.5433193,"dec_deg":41.2289354,"epoch_ra_deg":155.943092,"epoch_dec_deg":41.093517,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 89744","semi_major_axis_km":137181247.4319,"periapsis_km":null,"mass_kg":1.5849419847058121e+28,"mass_msun":0.0079709,"constellation":"Ursa Major","discovered":"1999","featured":false,"url":"https://spacecatalog.org/object/hd-89744-b","radius_km":80364.06,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 89744","host_v_mag":5.73469,"eccentricity":0.677,"uncertainties":{"mass_kg":[3.416641404156241e+26,3.416641404156241e+26],"distance_ly":[0.35029194966778243,0.3522488879340829],"eccentricity":[0.003,0.003],"host_radius_solar":[0.106369,0.097324],"semi_major_axis_km":[1346380.8362999998,1346380.8362999998],"orbital_period_days":[0.02,0.02],"argument_of_periastron_deg":[0.4,0.4]},"host_mass_solar":1.86,"stars_in_system":2,"discovery_method":"Radial Velocity","host_radius_solar":2.13257,"planets_in_system":1,"discovery_facility":"Fred Lawrence Whipple Observatory","host_spectral_type":"F7 V","host_temperature_k":6291,"orbital_period_days":256.78,"periastron_epoch_bjd":2453816.1,"equilibrium_temperature_k":462.62,"argument_of_periastron_deg":193.7},"designations":[{"catalog":"Exoplanet","designation":"HD 89744 b"},{"catalog":"Host star","designation":"HD 89744"}],"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."}