{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.685","julian_year":2026.685,"time":"2026-09-08T08:08:19.915Z","years_from_j2000":26.685,"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-97658-b","name":"HD 97658 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":70.32518585052878,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":168.6376584,"dec_deg":25.7105962,"epoch_ra_deg":168.996959,"epoch_dec_deg":25.564291,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 97658","semi_major_axis_km":12042628.591349998,"periapsis_km":null,"mass_kg":4.956899330266845e+25,"mass_msun":0.000024929,"constellation":"Leo","discovered":"2010","featured":false,"url":"https://spacecatalog.org/object/hd-97658-b","radius_km":13521.572000000002,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 97658","host_v_mag":7.76,"eccentricity":0.05,"uncertainties":{"mass_kg":[6.569384654570517e+24,6.569384654570517e+24],"radius_km":[382.68600000000004,382.68600000000004],"distance_ly":[0.08251756356233608,0.08284371994005282],"eccentricity":[0.03,0.04],"host_mass_solar":[0.08,0.08],"inclination_deg":[0.24,0.41],"host_radius_solar":[0.008,0.008],"host_temperature_k":[43,43],"semi_major_axis_km":[164557.65777,149597.8707],"orbital_period_days":[8e-7,8e-7],"argument_of_periastron_deg":[51,69]},"host_mass_solar":0.85,"inclination_deg":89.05,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.728,"planets_in_system":1,"discovery_facility":"W. M. Keck Observatory","host_spectral_type":"K1 V","host_temperature_k":5212,"orbital_period_days":9.4897116,"transit_midpoint_bjd":2458904.9366,"equilibrium_temperature_k":751,"argument_of_periastron_deg":-10},"designations":[{"catalog":"Exoplanet","designation":"HD 97658 b"},{"catalog":"Host star","designation":"HD 97658"}],"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."}