{"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":"2026-09-02T17:05:14.018Z","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-129087","name":"HD 129087","class":"a0v_white_main_sequence_star","category":"star","object_type":"A0V white main-sequence star","mag":8.87,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":null,"distance_method":null,"ra_deg":220.64739,"dec_deg":-54.578681,"epoch_ra_deg":221.126668,"epoch_dec_deg":-54.693273,"epoch_moved_arcsec":0.421,"pm_ra_mas_yr":-11.58,"pm_dec_mas_yr":-10.74,"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-129087","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"14426-5435","age_years":270041020,"companions":[{"measured":2016,"magnitude":13.7,"components":null,"discoverer_code":"RST2918","separation_arcsec":2.6,"position_angle_deg":137}],"mass_solar":2.845,"radius_solar":2.778,"spectral_type":"A0V","color_index_bv":0.147,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1975MSS...C01....0H, quality C)","surface_gravity_log_g":3.888,"surface_temperature_k":10723,"proper_motion_ra_mas_yr":-11.58,"proper_motion_dec_mas_yr":-10.74,"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":90.9505},"designations":[{"catalog":"HD","designation":"HD 129087"},{"catalog":"HIP","designation":"HIP 71920"}],"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."}