{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.680","julian_year":2026.68,"time":"2026-09-06T12:52:39.638Z","years_from_j2000":26.68,"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-133954","name":"HD 133954","class":"a2_3iii_white_giant","category":"star","object_type":"A2/3III white giant","mag":8.13,"mag_band":"V","abs_mag":2.05,"abs_mag_band":"V","distance_ly":536.4414622167035,"distance_method":"parallax","ra_deg":227.177145,"dec_deg":-44.484545,"epoch_ra_deg":227.627954,"epoch_dec_deg":-44.587628,"epoch_moved_arcsec":0.789,"pm_ra_mas_yr":-19.14,"pm_dec_mas_yr":-22.56,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Lupus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-133954","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"15087-4429","age_years":217739310,"companions":[{"measured":2016,"magnitude":10.6,"components":"AB","discoverer_code":"JNN 201","separation_arcsec":1.8,"position_angle_deg":211}],"mass_solar":1.792,"radius_solar":1.569,"spectral_type":"A2/3III","color_index_bv":0.154,"luminosity_solar":13.182567385564068,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1978MSS...C02....0H, quality D)","surface_gravity_log_g":4.231,"surface_temperature_k":8465,"proper_motion_ra_mas_yr":-19.14,"proper_motion_dec_mas_yr":-22.56,"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":11.0669},"designations":[{"catalog":"HD","designation":"HD 133954"},{"catalog":"HIP","designation":"HIP 74104"}],"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."}