{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.669","julian_year":2026.669,"time":"2026-09-02T10:43:23.470Z","years_from_j2000":26.669,"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-150100","name":"16 Dra","class":"b9_5v_da_blue_white_main_sequence_star","category":"star","object_type":"B9.5V+DA: blue-white main-sequence star","mag":5.53,"mag_band":"V","abs_mag":-0.055,"abs_mag_band":"V","distance_ly":426.9064089498231,"distance_method":"parallax","ra_deg":249.04761,"dec_deg":52.900048,"epoch_ra_deg":249.208061,"epoch_dec_deg":52.844851,"epoch_moved_arcsec":0.839,"pm_ra_mas_yr":-12.94,"pm_dec_mas_yr":28.67,"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-150100","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"16362+5255","age_years":266995500,"companions":[{"measured":2020,"magnitude":11.19,"components":"CD","discoverer_code":"STFA 30","separation_arcsec":125.5,"position_angle_deg":123}],"mass_solar":3.048,"radius_solar":3.202,"spectral_type":"B9.5V+DA:","color_index_bv":-0.06,"luminosity_solar":91.62204901219992,"radial_velocity_km_s":-9,"spectral_type_source":"SIMBAD (2014yCat....1.2023S, quality C)","surface_gravity_log_g":3.818,"surface_temperature_k":10780,"proper_motion_ra_mas_yr":-12.94,"proper_motion_dec_mas_yr":28.67,"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","bolometric_luminosity_solar":129.9919},"designations":[{"catalog":"Bayer/Flamsteed","designation":"16 Dra"},{"catalog":"HD","designation":"HD 150100"},{"catalog":"HIP","designation":"HIP 81290"},{"catalog":"HR","designation":"HR 6184"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-01T22:58:55.274Z","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."}