{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.665","julian_year":2026.665,"time":"2026-08-31T23:52:05.219Z","years_from_j2000":26.665,"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-6872","name":"HD 6872","class":"f4v_yellow_white_main_sequence_star","category":"star","object_type":"F4V yellow-white main-sequence star","mag":8.09,"mag_band":"V","abs_mag":3.595,"abs_mag_band":"V","distance_ly":258.44403060810345,"distance_method":"parallax","ra_deg":17.531295,"dec_deg":51.746685,"epoch_ra_deg":17.929408,"epoch_dec_deg":51.889666,"epoch_moved_arcsec":2.089,"pm_ra_mas_yr":-77.51,"pm_dec_mas_yr":-11.39,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cassiopeia","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-6872","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"01101+5145","age_years":2928577700,"companions":[{"measured":2024,"magnitude":8.59,"components":"AB","discoverer_code":"STT  23","separation_arcsec":14.6,"position_angle_deg":191},{"measured":2015,"magnitude":12.45,"components":"AC","discoverer_code":"STT  23","separation_arcsec":57.5,"position_angle_deg":93}],"mass_solar":1.301,"radius_solar":1.608,"spectral_type":"F4V","uncertainties":{"metallicity_fe_h":[0.03,0.03]},"color_index_bv":0.47,"luminosity_solar":3.1768740706497707,"metallicity_fe_h":-0.05,"variable_mag_max":7.974,"variable_mag_min":8.274,"radial_velocity_km_s":-29.3,"spectral_type_source":"SIMBAD (1988ApJ...331..922A, quality C)","surface_gravity_log_g":4.111,"surface_temperature_k":6367,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":-77.51,"proper_motion_dec_mas_yr":-11.39,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":3.8244},"designations":[{"catalog":"HD","designation":"HD 6872"},{"catalog":"HIP","designation":"HIP 5480"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-30T09:56:50.739Z","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."}