{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.680","julian_year":2026.68,"time":"2026-09-06T05:23:57.488Z","years_from_j2000":26.68,"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-13808-b","name":"HD 13808 b","class":"neptune_like_planet","category":"exoplanet","object_type":"Neptune-like planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":92.07557621132524,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":33.1780708,"dec_deg":-53.7437591,"epoch_ra_deg":33.413184,"epoch_dec_deg":-53.617499,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 13808","semi_major_axis_km":15736200.018933,"periapsis_km":null,"mass_kg":6.688828011926345e+25,"mass_msun":0.0000336391,"constellation":"Eridanus","discovered":"2021","featured":false,"url":"https://spacecatalog.org/object/hd-13808-b","radius_km":21366.635000000002,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 13808","host_v_mag":8.36,"eccentricity":0.071,"uncertainties":{"mass_kg":[3.9416307927423103e+24,7.166601441349655e+24],"distance_ly":[0.0841483454509198,0.08382218907320306],"eccentricity":[0.047,0.027],"host_mass_solar":[0.022,0.022],"host_radius_solar":[0.022,0.017],"host_temperature_k":[50,50],"semi_major_axis_km":[164557.65777,139126.01975099999],"orbital_period_days":[0.0015,0.0015]},"host_mass_solar":0.771,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.781,"planets_in_system":2,"discovery_facility":"La Silla Observatory","host_spectral_type":"K2 V","host_temperature_k":5035,"orbital_period_days":14.1815,"equilibrium_temperature_k":661.56},"designations":[{"catalog":"Exoplanet","designation":"HD 13808 b"},{"catalog":"Host star","designation":"HD 13808"}],"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."}