{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.684","julian_year":2026.684,"time":"2026-09-07T16:24:39.335Z","years_from_j2000":26.684,"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-115813","name":"HD 115813","class":"a3v_white_main_sequence_star","category":"star","object_type":"A3V white main-sequence star","mag":7.27,"mag_band":"V","abs_mag":0.323,"abs_mag_band":"V","distance_ly":799.4027586561838,"distance_method":"parallax","ra_deg":199.93377,"dec_deg":-11.67298,"epoch_ra_deg":200.28804,"epoch_dec_deg":-11.814371,"epoch_moved_arcsec":0.964,"pm_ra_mas_yr":-31.07,"pm_dec_mas_yr":-18.43,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Virgo","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-115813","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"13197-1140","age_years":772851770,"companions":[{"measured":2016,"magnitude":11.35,"components":null,"discoverer_code":"HU  740","separation_arcsec":4.1,"position_angle_deg":273}],"mass_solar":2.146,"radius_solar":3.018,"spectral_type":"A3V","color_index_bv":0.1,"luminosity_solar":64.68446641717216,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1999MSS...C05....0H, quality C)","surface_gravity_log_g":3.734,"surface_temperature_k":7964,"proper_motion_ra_mas_yr":-31.07,"proper_motion_dec_mas_yr":-18.43,"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":32.4378},"designations":[{"catalog":"HD","designation":"HD 115813"},{"catalog":"HIP","designation":"HIP 65023"}],"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."}