{"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":"2026-09-07T10:30:22.700Z","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":"hd-164595-b","name":"HD 164595 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":92.1522229600887,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":270.1613723,"dec_deg":29.5726698,"epoch_ra_deg":270.420744,"epoch_dec_deg":29.571129,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 164595","semi_major_axis_km":34407510.261,"periapsis_km":null,"mass_kg":9.639078938615286e+25,"mass_msun":0.0000484763,"constellation":"Hercules","discovered":"2015","featured":false,"url":"https://spacecatalog.org/object/hd-164595-b","radius_km":26532.896,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 164595","host_v_mag":7.08597,"eccentricity":0.088,"uncertainties":{"mass_kg":[1.6244296600392554e+25,1.6244296600392554e+25],"distance_ly":[0.06751437018736589,0.06784052656508263],"eccentricity":[0.066,0.12],"host_mass_solar":[0.03,0.03],"host_radius_solar":[0.022022,0.016087],"host_temperature_k":[40,40],"orbital_period_days":[0.24,0.24],"argument_of_periastron_deg":[110,160]},"host_mass_solar":0.99,"stars_in_system":2,"discovery_method":"Radial Velocity","host_radius_solar":1.023606,"planets_in_system":1,"discovery_facility":"Haute-Provence Observatory","host_spectral_type":"G2 V","host_temperature_k":5790,"orbital_period_days":40,"periastron_epoch_bjd":2456280,"equilibrium_temperature_k":589,"argument_of_periastron_deg":145},"designations":[{"catalog":"Exoplanet","designation":"HD 164595 b"},{"catalog":"Host star","designation":"HD 164595"}],"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."}