{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.687","julian_year":2026.687,"time":"2026-09-08T18:05:53.061Z","years_from_j2000":26.687,"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-29399-b","name":"HD 29399 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":144.00391157674113,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":68.3903471,"dec_deg":-62.8237576,"epoch_ra_deg":68.465662,"epoch_dec_deg":-62.766599,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 29399","semi_major_axis_km":286180726.6491,"periapsis_km":null,"mass_kg":2.9800556216180515e+27,"mass_msun":0.00149871,"constellation":"Reticulum","discovered":"2022","featured":false,"url":"https://spacecatalog.org/object/hd-29399-b","radius_km":86104.35,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 29399","host_v_mag":5.79,"eccentricity":0.05,"uncertainties":{"mass_kg":[2.0879370597323927e+26,2.0879370597323927e+26],"distance_ly":[0.3486611677791987,0.3486611677791987],"eccentricity":[0.05,0.05],"host_mass_solar":[0.1,0.1],"host_radius_solar":[0.11,0.11],"host_temperature_k":[52,52],"semi_major_axis_km":[1196782.9656,1196782.9656],"orbital_period_days":[5.9,5.9],"argument_of_periastron_deg":[85.1,85.1]},"host_mass_solar":1.17,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":4.5,"planets_in_system":1,"discovery_facility":"La Silla Observatory","host_spectral_type":"K1 III","host_temperature_k":4845,"orbital_period_days":892.7,"periastron_epoch_bjd":2455965,"equilibrium_temperature_k":358.32,"argument_of_periastron_deg":-13.1},"designations":[{"catalog":"Exoplanet","designation":"HD 29399 b"},{"catalog":"Host star","designation":"HD 29399"}],"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."}