{"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":"2026-09-05T08:37:29.778Z","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":"hats-61-b","name":"HATS-61 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":2217.0838547311123,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":61.6578005,"dec_deg":-25.3496674,"epoch_ra_deg":61.940126,"epoch_dec_deg":-25.276987,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HATS-61","semi_major_axis_km":11830199.614955999,"periapsis_km":null,"mass_kg":6.453655985628456e+27,"mass_msun":0.00324564,"constellation":"Eridanus","discovered":"2018","featured":false,"url":"https://spacecatalog.org/object/hats-61-b","radius_km":85433.08686550001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HATS-61","host_v_mag":13.352,"uncertainties":{"mass_kg":[2.657387758788188e+26,2.657387758788188e+26],"radius_km":[4789.9722343,4789.9722343],"distance_ly":[27.782000253912205,28.479974902226033],"host_mass_solar":[0.014,0.014],"inclination_deg":[0.18,0.18],"host_radius_solar":[0.024,0.024],"host_temperature_k":[21,21],"semi_major_axis_km":[49367.297330999994,49367.297330999994],"orbital_period_days":[0.000024,0.000024]},"host_mass_solar":1.076,"inclination_deg":87.15,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.664,"planets_in_system":1,"discovery_facility":"HATSouth","host_temperature_k":5542,"orbital_period_days":7.817953,"transit_midpoint_bjd":2457673.0611,"eccentricity_upper_limit":0.092,"equilibrium_temperature_k":1226.1},"designations":[{"catalog":"Exoplanet","designation":"HATS-61 b"},{"catalog":"Host star","designation":"HATS-61"}],"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."}