{"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":"2026-09-08T23:58:15.806Z","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":"hd-177565-b","name":"HD 177565 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":55.178809825740935,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":286.7175787,"dec_deg":-37.8122394,"epoch_ra_deg":287.173385,"epoch_dec_deg":-37.770855,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 177565","semi_major_axis_km":36801076.1922,"periapsis_km":null,"mass_kg":9.017973480364982e+25,"mass_msun":0.0000453527,"constellation":"Corona Australis","discovered":"2017","featured":false,"url":"https://spacecatalog.org/object/hd-177565-b","radius_km":25512.4,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 177565","host_v_mag":6.15,"eccentricity":0.0593,"uncertainties":{"mass_kg":[3.6131615600137843e+25,3.8221874353864827e+25],"distance_ly":[0.06262202452161474,0.06262202452161474],"eccentricity":[0.05745,0.1717],"host_mass_solar":[0.1,0.1],"host_radius_solar":[0.02187,0.014886],"host_temperature_k":[19,19],"semi_major_axis_km":[2842359.5432999996,2842359.5432999996],"orbital_period_days":[0.293,0.586],"argument_of_periastron_deg":[306.08,45.84]},"host_mass_solar":1,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.971489,"planets_in_system":1,"discovery_facility":"La Silla Observatory","host_spectral_type":"G8V","host_temperature_k":5627,"orbital_period_days":44.505,"equilibrium_temperature_k":539.21,"argument_of_periastron_deg":309.97},"designations":[{"catalog":"Exoplanet","designation":"HD 177565 b"},{"catalog":"Host star","designation":"HD 177565"}],"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."}