{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.687","julian_year":2026.687,"time":"2026-09-08T18:24:33.796Z","years_from_j2000":26.687,"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-105854-b","name":"HIP 105854 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":256.4831784652704,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":321.5962275,"dec_deg":-37.8294782,"epoch_ra_deg":322.013621,"epoch_dec_deg":-37.713339,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HIP 105854","semi_major_axis_km":121174275.267,"periapsis_km":null,"mass_kg":1.5564066680251114e+28,"mass_msun":0.00782739,"constellation":"Microscopium","discovered":"2014","featured":false,"url":"https://spacecatalog.org/object/hip-105854-b","radius_km":80364.06,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HIP 105854","host_v_mag":5.64,"eccentricity":0.02,"uncertainties":{"mass_kg":[3.798298763915317e+26,3.798298763915317e+26],"distance_ly":[2.425624981079421,2.425624981079421],"eccentricity":[0.03,0.03],"host_mass_solar":[0.1,0.1],"host_radius_solar":[0.580153,0.546805],"host_temperature_k":[100,100],"semi_major_axis_km":[4487936.120999999,4487936.120999999],"orbital_period_days":[0.5,0.5],"argument_of_periastron_deg":[4.9,4.9]},"host_mass_solar":2.1,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":10.305119,"planets_in_system":1,"discovery_facility":"Multiple Observatories","host_spectral_type":"K2 III","host_temperature_k":4780,"orbital_period_days":184.2,"periastron_epoch_bjd":2455262.4,"equilibrium_temperature_k":822.14,"argument_of_periastron_deg":343.2},"designations":[{"catalog":"Exoplanet","designation":"HIP 105854 b"},{"catalog":"Host star","designation":"HIP 105854"}],"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."}