{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.677","julian_year":2026.677,"time":"2026-09-05T03:39:31.469Z","years_from_j2000":26.677,"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-210191","name":"35 Aqr","class":"b2iii_blue_white_giant","category":"star","object_type":"B2III blue-white giant","mag":5.8,"mag_band":"V","abs_mag":-3.469,"abs_mag_band":"V","distance_ly":2329.6883656686846,"distance_method":"parallax","ra_deg":332.2458,"dec_deg":-18.519592,"epoch_ra_deg":332.613706,"epoch_dec_deg":-18.38816,"epoch_moved_arcsec":0.199,"pm_ra_mas_yr":0.17,"pm_dec_mas_yr":-7.47,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Aquarius","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-210191","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"22091-1831","companions":[{"measured":2020,"magnitude":12.44,"components":"AD","discoverer_code":"BU  170","separation_arcsec":81.3,"position_angle_deg":28},{"measured":2020,"magnitude":8.5,"components":"A,BC","discoverer_code":"BU  170","separation_arcsec":161,"position_angle_deg":40}],"radius_solar":16.473,"spectral_type":"B2III","color_index_bv":-0.154,"luminosity_solar":2126.179859862522,"radial_velocity_km_s":-5,"spectral_type_source":"SIMBAD (1988MSS...C04....0H, quality C)","surface_gravity_log_g":3.008,"surface_temperature_k":16102,"proper_motion_ra_mas_yr":0.17,"proper_motion_dec_mas_yr":-7.47,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4) — low confidence: above 7,500 K GSP-Phot's temperature and extinction are degenerate"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"35 Aqr"},{"catalog":"HD","designation":"HD 210191"},{"catalog":"HIP","designation":"HIP 109332"},{"catalog":"HR","designation":"HR 8439"}],"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."}