{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.686","julian_year":2026.686,"time":"2026-09-08T14:18:37.413Z","years_from_j2000":26.686,"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":"hd-80913-b","name":"HD 80913 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":200.13053183612692,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":138.1021548,"dec_deg":-81.768451,"epoch_ra_deg":137.736756,"epoch_dec_deg":-81.877934,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 80913","semi_major_axis_km":1488498813.4649997,"periapsis_km":null,"mass_kg":4.482231429866715e+28,"mass_msun":0.0225418,"constellation":"Chamaeleon","discovered":"2022","featured":false,"url":"https://spacecatalog.org/object/hd-80913-b","radius_km":76537.20000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 80913","host_v_mag":7.49,"eccentricity":0.313,"uncertainties":{"mass_kg":[7.328659079678615e+27,6.821859811537598e+27],"distance_ly":[0.2729928881489142,0.27364520090434774],"eccentricity":[0.131,0.152],"host_mass_solar":[0.139,0.139],"inclination_deg":[4.587,5.989],"host_radius_solar":[0.054,0.078],"host_temperature_k":[118.71,91.58],"semi_major_axis_km":[210932997.68699998,251773216.3881],"orbital_period_days":[1973.20021,2660.45783],"argument_of_periastron_deg":[13.42,18.217]},"host_mass_solar":1.11,"inclination_deg":22.331,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.6542,"planets_in_system":1,"discovery_facility":"Multiple Observatories","host_temperature_k":6013.24,"orbital_period_days":10839.83341,"periastron_epoch_bjd":2450316.351,"equilibrium_temperature_k":118.23,"argument_of_periastron_deg":96.716},"designations":[{"catalog":"Exoplanet","designation":"HD 80913 b"},{"catalog":"Host star","designation":"HD 80913"}],"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."}