{"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":"2026-09-05T06:54:59.140Z","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":"hat-p-44-c","name":"HAT-P-44 c","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1134.5349598876921,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":213.1438604,"dec_deg":47.0147826,"epoch_ra_deg":213.402224,"epoch_dec_deg":46.888511,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HAT-P-44","semi_major_axis_km":262095469.46639997,"periapsis_km":null,"mass_kg":7.59241701032318e+27,"mass_msun":0.00381834,"constellation":"Boötes","discovered":"2014","featured":false,"url":"https://spacecatalog.org/object/hat-p-44-c","radius_km":82915.3,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HAT-P-44","host_v_mag":13.225,"eccentricity":0.494,"uncertainties":{"mass_kg":[1.518722288779348e+27,2.6570174843803847e+27],"distance_ly":[7.172178745991188,7.260240967974708],"eccentricity":[0.081,0.081],"host_mass_solar":[0.041,0.041],"host_radius_solar":[0.037,0.08],"host_temperature_k":[100,100],"semi_major_axis_km":[3739946.7675,3739946.7675],"orbital_period_days":[1.7,1.7]},"host_mass_solar":0.942,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.949,"planets_in_system":2,"discovery_facility":"W. M. Keck Observatory","host_temperature_k":5295,"orbital_period_days":872.2,"transit_midpoint_bjd":2455711.2,"equilibrium_temperature_k":187.92},"designations":[{"catalog":"Exoplanet","designation":"HAT-P-44 c"},{"catalog":"Host star","designation":"HAT-P-44"}],"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."}