{"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":"2026-09-06T23:23:35.866Z","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":"hats-8-b","name":"HATS-8 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":2591.7592551969983,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":294.9416887,"dec_deg":-25.7483655,"epoch_ra_deg":295.351601,"epoch_dec_deg":-25.686887,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HATS-8","semi_major_axis_km":6981732.625569,"periapsis_km":null,"mass_kg":2.619425076519785e+26,"mass_msun":0.000131735,"constellation":"Sagittarius","discovered":"2015","featured":false,"url":"https://spacecatalog.org/object/hats-8-b","radius_km":62412.6232917,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HATS-8","host_v_mag":14.512,"uncertainties":{"mass_kg":[3.606454815498255e+25,3.606454815498255e+25],"radius_km":[5361.9092175,8793.5311167],"distance_ly":[60.41720740824955,63.313476042374226],"host_mass_solar":[0.037,0.037],"inclination_deg":[1.8,1.2],"host_radius_solar":[0.059,0.149],"host_temperature_k":[50,50],"semi_major_axis_km":[82278.828885,82278.828885],"orbital_period_days":[0.00001,0.00001]},"host_mass_solar":1.056,"inclination_deg":87.8,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.086,"planets_in_system":1,"discovery_facility":"HATSouth","host_temperature_k":5679,"orbital_period_days":3.583893,"transit_midpoint_bjd":2456672.1102,"eccentricity_upper_limit":0.376,"equilibrium_temperature_k":1324},"designations":[{"catalog":"Exoplanet","designation":"HATS-8 b"},{"catalog":"Host star","designation":"HATS-8"}],"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."}