{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.684","julian_year":2026.684,"time":"2026-09-07T19:03:44.194Z","years_from_j2000":26.684,"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":"hats-2-b","name":"HATS-2 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1115.210194507975,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":176.7388264,"dec_deg":-22.5630097,"epoch_ra_deg":177.078771,"epoch_dec_deg":-22.712253,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HATS-2","semi_major_axis_km":3466182.6641189996,"periapsis_km":null,"mass_kg":2.6004307016667073e+27,"mass_msun":0.00130779,"constellation":"Crater","discovered":"2013","featured":false,"url":"https://spacecatalog.org/object/hats-2-b","radius_km":80214.02380793501,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HATS-2","host_v_mag":13.565,"eccentricity":0,"uncertainties":{"mass_kg":[3.036999359610753e+26,3.036999359610753e+26],"radius_km":[1715.808015674,1715.808015674],"distance_ly":[11.735106470248427,11.982985317313153],"host_mass_solar":[0.052,0.052],"inclination_deg":[0.18,0.18],"host_radius_solar":[0.02,0.02],"host_temperature_k":[95,95],"semi_major_axis_km":[65823.063108,65823.063108],"orbital_period_days":[8e-8,8e-8]},"host_mass_solar":0.904,"inclination_deg":87.83,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.876,"planets_in_system":1,"discovery_facility":"HATSouth","host_spectral_type":"K","host_temperature_k":5227,"orbital_period_days":1.35413379,"transit_midpoint_bjd":2458591.084931,"equilibrium_temperature_k":1550,"argument_of_periastron_deg":0},"designations":[{"catalog":"Exoplanet","designation":"HATS-2 b"},{"catalog":"Host star","designation":"HATS-2"}],"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."}