{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.683","julian_year":2026.683,"time":"2026-09-07T15:18:31.168Z","years_from_j2000":26.683,"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-181234-b","name":"HD 181234 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":155.72597179188088,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":289.9998695,"dec_deg":-9.32497,"epoch_ra_deg":290.367252,"epoch_dec_deg":-9.275521,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 181234","semi_major_axis_km":1111063385.6888998,"periapsis_km":null,"mass_kg":1.7802510621100367e+28,"mass_msun":0.00895314,"constellation":"Aquila","discovered":"2019","featured":false,"url":"https://spacecatalog.org/object/hd-181234-b","radius_km":79726.25,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 181234","host_v_mag":8.59,"eccentricity":0.726,"uncertainties":{"mass_kg":[1.8848377275524516e+27,1.9171058457542877e+27],"distance_ly":[0.420741727254599,0.42335097827633295],"eccentricity":[0.01,0.01],"host_mass_solar":[0.118,0.118],"inclination_deg":[41.61,24.466],"host_radius_solar":[0.023986,0.023986],"host_temperature_k":[60,60],"semi_major_axis_km":[50863276.038,45477752.69279999],"orbital_period_days":[121.82598,113.6102],"argument_of_periastron_deg":[2.643,2.558]},"host_mass_solar":0.94,"inclination_deg":98.732,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.059423,"planets_in_system":1,"discovery_facility":"La Silla Observatory","host_spectral_type":"G8 IV","host_temperature_k":5386,"orbital_period_days":7593.40512,"periastron_epoch_bjd":2450080.111,"transit_midpoint_bjd":2457580,"equilibrium_temperature_k":98.09,"argument_of_periastron_deg":95.367},"designations":[{"catalog":"Exoplanet","designation":"HD 181234 b"},{"catalog":"Host star","designation":"HD 181234"}],"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."}