{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.654","julian_year":2026.654,"time":"2026-08-27T20:45:10.310Z","years_from_j2000":26.654,"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-153172","name":"HD 153172","class":"a8_9v_white_main_sequence_star","category":"star","object_type":"A8/9V white main-sequence star","mag":8.21,"mag_band":"V","abs_mag":3.012,"abs_mag_band":"V","distance_ly":357.2358189493719,"distance_method":"parallax","ra_deg":254.69638500000002,"dec_deg":-23.986696,"epoch_ra_deg":255.104422,"epoch_dec_deg":-24.027986,"epoch_moved_arcsec":0.559,"pm_ra_mas_yr":12.06,"pm_dec_mas_yr":-17.18,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Ophiuchus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-153172","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":954191700,"mass_solar":1.594,"radius_solar":1.644,"spectral_type":"A8/9V","color_index_bv":0.279,"luminosity_solar":5.435005651294466,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1988MSS...C04....0H, quality D)","surface_gravity_log_g":4.026,"surface_temperature_k":7480,"proper_motion_ra_mas_yr":12.06,"proper_motion_dec_mas_yr":-17.18,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4) — low confidence: Gaia's classifier calls the source a binary, which GSP-Phot fitted as one star","bolometric_luminosity_solar":7.8814},"designations":[{"catalog":"HD","designation":"HD 153172"},{"catalog":"HIP","designation":"HIP 83097"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-27T19:16:43.430Z","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."}