{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.685","julian_year":2026.685,"time":"2026-09-08T07:33:01.483Z","years_from_j2000":26.685,"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":"wasp-55-b","name":"WASP-55 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":970.1912842837793,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":203.7581951,"dec_deg":-17.5034961,"epoch_ra_deg":204.121038,"epoch_dec_deg":-17.641159,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"WASP-55","semi_major_axis_km":8347561.18506,"periapsis_km":null,"mass_kg":1.112301015445494e+27,"mass_msun":0.000559392,"constellation":"Virgo","discovered":"2012","featured":false,"url":"https://spacecatalog.org/object/wasp-55-b","radius_km":93940.487741984,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"WASP-55","host_v_mag":11.753,"eccentricity":0,"uncertainties":{"mass_kg":[6.073998716832639e+25,6.263811178599961e+25],"radius_km":[1787.300011012,1501.331965879],"distance_ly":[12.583113052311962,12.912530993805872],"host_mass_solar":[0.025,0.025],"inclination_deg":[0.38,0.57],"host_radius_solar":[0.013,0.012],"host_temperature_k":[71,71],"semi_major_axis_km":[89758.72241999999,89758.72241999999],"orbital_period_days":[0.0000013,0.0000013]},"host_mass_solar":1.071,"inclination_deg":88.74,"stars_in_system":2,"discovery_method":"Transit","host_radius_solar":1.09,"planets_in_system":1,"discovery_facility":"SuperWASP","host_temperature_k":6096,"orbital_period_days":4.465631,"transit_midpoint_bjd":2455737.93919,"equilibrium_temperature_k":1342},"designations":[{"catalog":"Exoplanet","designation":"WASP-55 b"},{"catalog":"Host star","designation":"WASP-55"}],"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."}