{"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":"2026-09-07T01:15:21.055Z","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-27-b","name":"HATS-27 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":2664.658467180468,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":193.5524603,"dec_deg":-46.5877159,"epoch_ra_deg":193.931983,"epoch_dec_deg":-46.73355,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HATS-27","semi_major_axis_km":9140429.89977,"periapsis_km":null,"mass_kg":1.0060110801126711e+27,"mass_msun":0.000505937,"constellation":"Centaurus","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/hats-27-b","radius_km":107238.18435000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HATS-27","host_v_mag":12.782,"uncertainties":{"mass_kg":[2.4675743474461742e+26,2.4675743474461742e+26],"radius_km":[7864.133519000001,14298.42458],"distance_ly":[121.92051555429586,133.95894745582086],"host_mass_solar":[0.048,0.048],"inclination_deg":[1.3,1.3],"host_radius_solar":[0.1,0.17],"host_temperature_k":[64,64],"semi_major_axis_km":[101726.55207599999,101726.55207599999],"orbital_period_days":[0.000014,0.000014]},"host_mass_solar":1.415,"inclination_deg":87.3,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.74,"planets_in_system":1,"discovery_facility":"HATSouth","host_spectral_type":"F","host_temperature_k":6438,"orbital_period_days":4.637038,"transit_midpoint_bjd":2457029.3374,"eccentricity_upper_limit":0.581,"equilibrium_temperature_k":1659},"designations":[{"catalog":"Exoplanet","designation":"HATS-27 b"},{"catalog":"Host star","designation":"HATS-27"}],"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."}