{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.680","julian_year":2026.68,"time":"2026-09-06T11:49:24.626Z","years_from_j2000":26.68,"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-158259-b","name":"HD 158259 b","class":"super_earth","category":"exoplanet","object_type":"Super-Earth","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":88.22464785962366,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":261.3495847,"dec_deg":52.7904721,"epoch_ra_deg":261.499562,"epoch_dec_deg":52.765905,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 158259","semi_major_axis_km":null,"periapsis_km":null,"mass_kg":1.3258212666496864e+25,"mass_msun":0.00000666775,"constellation":"Draco","discovered":"2020","featured":false,"url":"https://spacecatalog.org/object/hd-158259-b","radius_km":8178.510068000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 158259","host_v_mag":6.47915,"uncertainties":{"mass_kg":[2.6874755405061206e+24,2.329145468438638e+24],"radius_km":[424.24059712,424.24059712],"distance_ly":[0.07012362120909983,0.07012362120909983],"host_mass_solar":[0.1,0.1],"host_radius_solar":[0.08,0.03],"host_temperature_k":[124.62,124.62],"orbital_period_days":[0.0001,0.00009]},"host_mass_solar":1.08,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.21,"planets_in_system":5,"discovery_facility":"Haute-Provence Observatory","host_spectral_type":"G0","host_temperature_k":5801.89,"orbital_period_days":2.178,"transit_midpoint_bjd":2460338.523071,"equilibrium_temperature_k":1462},"designations":[{"catalog":"Exoplanet","designation":"HD 158259 b"}],"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."}