{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T17:21:17.431Z","years_from_j2000":26.681,"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-165155-b","name":"HD 165155 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":206.644200855508,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":271.4893395,"dec_deg":-29.9172536,"epoch_ra_deg":271.919617,"epoch_dec_deg":-29.915098,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 165155","semi_major_axis_km":169045593.89099997,"periapsis_km":null,"mass_kg":5.485607587784188e+27,"mass_msun":0.00275879,"constellation":"Sagittarius","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/hd-165155-b","radius_km":84190.92,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 165155","host_v_mag":9.36,"eccentricity":0.2,"uncertainties":{"mass_kg":[4.365708460866308e+26,4.365708460866308e+26],"distance_ly":[0.7071070268898997,0.7123255289333676],"eccentricity":[0.03,0.03],"host_mass_solar":[0.05,0.05],"host_radius_solar":[0.11,0.11],"host_temperature_k":[100,100],"semi_major_axis_km":[5983914.828,5983914.828],"orbital_period_days":[2.1,2.1],"argument_of_periastron_deg":[11.46,11.46]},"host_mass_solar":1.02,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.95,"planets_in_system":1,"discovery_facility":"Multiple Observatories","host_spectral_type":"G8 V","host_temperature_k":5426,"orbital_period_days":434.5,"equilibrium_temperature_k":239.9,"argument_of_periastron_deg":211.99},"designations":[{"catalog":"Exoplanet","designation":"HD 165155 b"},{"catalog":"Host star","designation":"HD 165155"}],"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."}