{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.666","julian_year":2026.666,"time":"2026-09-01T09:19:12.643Z","years_from_j2000":26.666,"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-101150","name":"HD 101150","class":"a5iv_white_subgiant","category":"star","object_type":"A5IV white subgiant","mag":6.49,"mag_band":"V","abs_mag":-0.131,"abs_mag_band":"V","distance_ly":688.0937408509021,"distance_method":"parallax","ra_deg":174.7047,"dec_deg":64.346965,"epoch_ra_deg":175.081294,"epoch_dec_deg":64.198312,"epoch_moved_arcsec":0.334,"pm_ra_mas_yr":12.47,"pm_dec_mas_yr":1.05,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Ursa Major","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-101150","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"11388+6421","age_years":287878450,"companions":[{"measured":2019,"magnitude":8.01,"components":null,"discoverer_code":"STF1559","separation_arcsec":2,"position_angle_deg":326}],"mass_solar":3.203,"radius_solar":4.439,"spectral_type":"A5IV","color_index_bv":0.154,"luminosity_solar":98.26525828295317,"radial_velocity_km_s":-22,"spectral_type_source":"SIMBAD (quality C)","surface_gravity_log_g":3.662,"surface_temperature_k":9999,"proper_motion_ra_mas_yr":12.47,"proper_motion_dec_mas_yr":1.05,"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":178.9037},"designations":[{"catalog":"HD","designation":"HD 101150"},{"catalog":"HIP","designation":"HIP 56816"},{"catalog":"HR","designation":"HR 4481"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-30T09:56:50.739Z","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."}