{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.676","julian_year":2026.676,"time":"2026-09-05T01:19:58.635Z","years_from_j2000":26.676,"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-173572","name":"HD 173572","class":"f0v_yellow_white_main_sequence_star","category":"star","object_type":"F0V yellow-white main-sequence star","mag":8.81,"mag_band":"V","abs_mag":3.144,"abs_mag_band":"V","distance_ly":443.1473657782284,"distance_method":"parallax","ra_deg":281.823885,"dec_deg":-30.861697,"epoch_ra_deg":282.255614,"epoch_dec_deg":-30.832876,"epoch_moved_arcsec":0.473,"pm_ra_mas_yr":-2.48,"pm_dec_mas_yr":-17.54,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Sagittarius","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-173572","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":1334591600,"mass_solar":1.505,"radius_solar":1.705,"spectral_type":"F0V","color_index_bv":0.406,"luminosity_solar":4.812824218676022,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1982MSS...C03....0H, quality C)","surface_gravity_log_g":4.096,"surface_temperature_k":7034,"proper_motion_ra_mas_yr":-2.48,"proper_motion_dec_mas_yr":-17.54,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":6.4497},"designations":[{"catalog":"HD","designation":"HD 173572"},{"catalog":"HIP","designation":"HIP 92184"}],"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."}