{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.687","julian_year":2026.687,"time":"2026-09-08T19:38:52.260Z","years_from_j2000":26.687,"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-37-b","name":"HAT-P-37 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1273.9472419789367,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":284.2960393,"dec_deg":51.2691212,"epoch_ra_deg":284.458828,"epoch_dec_deg":51.304023,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HAT-P-37","semi_major_axis_km":5669759.29953,"periapsis_km":null,"mass_kg":2.2188275835847957e+27,"mass_msun":0.00111588,"constellation":"Draco","discovered":"2011","featured":false,"url":"https://spacecatalog.org/object/hat-p-37-b","radius_km":84216.4324,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HAT-P-37","host_v_mag":13.427,"eccentricity":0.058,"uncertainties":{"mass_kg":[1.9549891515215078e+26,1.9549891515215078e+26],"radius_km":[5504.3003,5504.3003],"distance_ly":[8.760560305471728,8.881238165226923],"eccentricity":[0.038,0.038],"host_mass_solar":[0.043,0.043],"inclination_deg":[0.5,0.4],"host_radius_solar":[0.044,0.059],"host_temperature_k":[100,100],"semi_major_axis_km":[89758.72241999999,89758.72241999999],"orbital_period_days":[0.000007,0.000007],"argument_of_periastron_deg":[84,84]},"host_mass_solar":0.929,"inclination_deg":86.9,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.877,"planets_in_system":1,"discovery_facility":"HATNet","host_temperature_k":5500,"orbital_period_days":2.797436,"transit_midpoint_bjd":2455642.14318,"equilibrium_temperature_k":1271,"argument_of_periastron_deg":164},"designations":[{"catalog":"Exoplanet","designation":"HAT-P-37 b"},{"catalog":"Host star","designation":"HAT-P-37"}],"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."}