{"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":"2026-09-07T05:52:30.531Z","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":"hip-116454-b","name":"HIP 116454 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":203.68172247670682,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":353.9543517,"dec_deg":0.4447043,"epoch_ra_deg":354.298436,"epoch_dec_deg":0.593258,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HIP 116454","semi_major_axis_km":11848151.35944,"periapsis_km":null,"mass_kg":5.793002831757638e+25,"mass_msun":0.0000291338,"constellation":"Pisces","discovered":"2014","featured":false,"url":"https://spacecatalog.org/object/hip-116454-b","radius_km":15747.5289,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HIP 116454","host_v_mag":10.19,"eccentricity":0.215,"uncertainties":{"mass_kg":[7.166601441349655e+24,7.166601441349655e+24],"radius_km":[580.4071,637.8100000000001],"distance_ly":[0.593604607444473,0.5971923275993573],"eccentricity":[0.094,0.056],"host_mass_solar":[0.03,0.033],"inclination_deg":[0.45,0.68],"host_radius_solar":[0.022,0.024],"host_temperature_k":[78,79],"semi_major_axis_km":[149597.8707,164557.65777],"orbital_period_days":[0.0000045,0.0000041],"argument_of_periastron_deg":[20,19]},"host_mass_solar":0.8,"inclination_deg":88.91,"stars_in_system":2,"discovery_method":"Transit","host_radius_solar":0.758,"planets_in_system":1,"discovery_facility":"K2","host_spectral_type":"K1","host_temperature_k":5048,"orbital_period_days":9.1004157,"periastron_epoch_bjd":2456689.01,"transit_midpoint_bjd":2458072.29291,"equilibrium_temperature_k":753.2,"argument_of_periastron_deg":88},"designations":[{"catalog":"Exoplanet","designation":"HIP 116454 b"},{"catalog":"Host star","designation":"HIP 116454"}],"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."}