{"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":"2026-09-07T07:00:05.759Z","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":"hip-19976-b","name":"HIP 19976 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":131.3454564011766,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":64.2597881,"dec_deg":-40.7985198,"epoch_ra_deg":64.488624,"epoch_dec_deg":-40.731757,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HIP 19976","semi_major_axis_km":35005901.7438,"periapsis_km":null,"mass_kg":1.2907247280734568e+26,"mass_msun":0.0000649124,"constellation":"Horologium","discovered":"2022","featured":false,"url":"https://spacecatalog.org/object/hip-19976-b","radius_km":31507.814000000006,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HIP 19976","host_v_mag":10.48,"eccentricity":0.304,"uncertainties":{"mass_kg":[3.0369993584163196e+25,1.7083121379893983e+25],"distance_ly":[0.13926877328504944,0.13959492966276618],"eccentricity":[0.145,0.2],"host_mass_solar":[0.084,0.084],"host_radius_solar":[0.059049,0.074293],"host_temperature_k":[112.75,130.32],"semi_major_axis_km":[1495978.707,1346380.8362999998],"orbital_period_days":[0.0783,0.06282],"argument_of_periastron_deg":[44.076,26.723]},"host_mass_solar":0.67,"stars_in_system":2,"discovery_method":"Radial Velocity","host_radius_solar":0.772319,"planets_in_system":1,"discovery_facility":"Multiple Observatories","host_temperature_k":4316,"orbital_period_days":50.65905,"periastron_epoch_bjd":2455579.02,"equilibrium_temperature_k":378.1,"argument_of_periastron_deg":188.919},"designations":[{"catalog":"Exoplanet","designation":"HIP 19976 b"},{"catalog":"Host star","designation":"HIP 19976"}],"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."}