{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.670","julian_year":2026.67,"time":"2026-09-02T20:27:48.547Z","years_from_j2000":26.67,"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-160922","name":"28 ω Dra","class":"f4v_yellow_white_main_sequence_star","category":"star","object_type":"F4V yellow-white main-sequence star","mag":4.77,"mag_band":"V","abs_mag":2.946,"abs_mag_band":"V","distance_ly":75.55151564706188,"distance_method":"parallax","ra_deg":264.237885,"dec_deg":68.75797,"epoch_ra_deg":264.200069,"epoch_dec_deg":68.743002,"epoch_moved_arcsec":8.563,"pm_ra_mas_yr":1.34,"pm_dec_mas_yr":321.05,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Draco","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-160922","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"17370+6845","age_years":2490461300,"companions":[{"measured":2010,"magnitude":13.2,"components":null,"discoverer_code":"FOX 203","separation_arcsec":77.2,"position_angle_deg":249}],"mass_solar":1.426,"radius_solar":1.965,"spectral_type":"F4V","color_index_bv":0.43,"luminosity_solar":5.7756384639453335,"radial_velocity_km_s":-14.4,"spectral_type_source":"SIMBAD (2009ApJS..180..117A, quality C)","surface_gravity_log_g":3.9,"surface_temperature_k":6392,"proper_motion_ra_mas_yr":1.34,"proper_motion_dec_mas_yr":321.05,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":5.8031},"designations":[{"catalog":"Bayer/Flamsteed","designation":"28 Omega Dra"},{"catalog":"Gliese","designation":"GJ 4017"},{"catalog":"HD","designation":"HD 160922"},{"catalog":"HIP","designation":"HIP 86201"},{"catalog":"HR","designation":"HR 6596"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"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."}