{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.685","julian_year":2026.685,"time":"2026-09-08T04:50:12.351Z","years_from_j2000":26.685,"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":"v830-tau-b","name":"V830 Tau b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":424.365324611032,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":68.2918259,"dec_deg":24.5619241,"epoch_ra_deg":68.699415,"epoch_dec_deg":24.618909,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"V830 Tau","semi_major_axis_km":8527078.6299,"periapsis_km":null,"mass_kg":1.328693879394094e+27,"mass_msun":0.000668219,"constellation":"Taurus","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/v830-tau-b","radius_km":89293.40000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"V830 Tau","host_v_mag":12.23,"eccentricity":0,"uncertainties":{"mass_kg":[2.277760936104161e+26,2.277760936104161e+26],"distance_ly":[2.2749407345742854,2.2749407345742854],"host_mass_solar":[0.05,0.05],"inclination_deg":[10,10],"host_radius_solar":[0.2,0.2],"host_temperature_k":[50,50],"semi_major_axis_km":[149597.8707,149597.8707],"orbital_period_days":[0.008,0.008]},"host_mass_solar":1,"inclination_deg":55,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":2,"planets_in_system":1,"discovery_facility":"Multiple Observatories","host_temperature_k":4250,"orbital_period_days":4.927,"equilibrium_temperature_k":1213.95},"designations":[{"catalog":"Exoplanet","designation":"V830 Tau b"},{"catalog":"Host star","designation":"V830 Tau"}],"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."}