{"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":"2026-09-07T14:08:02.766Z","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-149143-b","name":"HD 149143 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":239.00771974720732,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":248.2126715,"dec_deg":2.0844547,"epoch_ra_deg":248.551969,"epoch_dec_deg":2.027207,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 149143","semi_major_axis_km":7928687.147099999,"periapsis_km":null,"mass_kg":2.5245183708487786e+27,"mass_msun":0.00126962,"constellation":"Ophiuchus","discovered":"2005","featured":false,"url":"https://spacecatalog.org/object/hd-149143-b","radius_km":86742.16,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 149143","host_v_mag":7.89,"eccentricity":0.0167,"uncertainties":{"mass_kg":[2.8472011701302012e+26,2.8472011701302012e+26],"distance_ly":[1.1702490832476755,1.1816645564677615],"eccentricity":[0.004,0.004],"host_mass_solar":[0.2,0.2],"host_radius_solar":[0.08,0.08],"semi_major_axis_km":[433833.82502999995,433833.82502999995],"orbital_period_days":[0.00001,0.00001],"argument_of_periastron_deg":[17,17]},"host_mass_solar":1.2,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.44,"planets_in_system":1,"discovery_facility":"Haute-Provence Observatory","host_spectral_type":"G0","host_temperature_k":5856,"orbital_period_days":4.07182,"periastron_epoch_bjd":2463199.12,"equilibrium_temperature_k":1471.9,"argument_of_periastron_deg":217},"designations":[{"catalog":"Exoplanet","designation":"HD 149143 b"},{"catalog":"Host star","designation":"HD 149143"}],"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."}