{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.682","julian_year":2026.682,"time":"2026-09-07T00:08:19.938Z","years_from_j2000":26.682,"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-16905-b","name":"HD 16905 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":129.61487066101154,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":40.0136203,"dec_deg":-61.3550396,"epoch_ra_deg":40.185113,"epoch_dec_deg":-61.239151,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 16905","semi_major_axis_km":1316461262.16,"periapsis_km":null,"mass_kg":2.1448807977250945e+28,"mass_msun":0.0107869,"constellation":"Horologium","discovered":"2022","featured":false,"url":"https://spacecatalog.org/object/hd-16905-b","radius_km":79088.44,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 16905","host_v_mag":9.44,"eccentricity":0.68,"uncertainties":{"mass_kg":[1.3286872198297045e+27,1.1388747598540323e+27],"distance_ly":[0.14742268272796802,0.14742268272796802],"eccentricity":[0.01,0.02],"host_mass_solar":[0.04,0.04],"inclination_deg":[3,3],"host_radius_solar":[0.058694,0.062814],"host_temperature_k":[149.78,140.4],"semi_major_axis_km":[44879361.20999999,59839148.28],"orbital_period_days":[522,618],"argument_of_periastron_deg":[1,1]},"host_mass_solar":0.85,"inclination_deg":43,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.77494,"planets_in_system":1,"discovery_facility":"Multiple Observatories","host_spectral_type":"K3 V","host_temperature_k":4866.12,"orbital_period_days":10256,"periastron_epoch_bjd":2455856,"equilibrium_temperature_k":69.63,"argument_of_periastron_deg":248},"designations":[{"catalog":"Exoplanet","designation":"HD 16905 b"},{"catalog":"Host star","designation":"HD 16905"}],"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."}