{"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":"2026-08-27T21:07:27.720Z","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-1679","name":"HD 1679","class":"k1iii_orange_giant","category":"star","object_type":"K1III orange giant","mag":6.92,"mag_band":"V","abs_mag":2.38,"abs_mag_band":"V","distance_ly":263.88040511188615,"distance_method":"parallax","ra_deg":5.267835,"dec_deg":-2.909599,"epoch_ra_deg":5.611846,"epoch_dec_deg":-2.760574,"epoch_moved_arcsec":2.352,"pm_ra_mas_yr":88.13,"pm_dec_mas_yr":4.6,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Pisces","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-1679","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":5081521000,"mass_solar":1.263,"radius_solar":4.976,"spectral_type":"K1III","uncertainties":{"metallicity_fe_h":[0.11,0.11]},"color_index_bv":1.036,"luminosity_solar":9.727472237769652,"metallicity_fe_h":0.28,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1999MSS...C05....0H, quality C)","surface_gravity_log_g":3.158,"surface_temperature_k":4841,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":88.13,"proper_motion_dec_mas_yr":4.6,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":12.2732},"designations":[{"catalog":"HD","designation":"HD 1679"},{"catalog":"HIP","designation":"HIP 1684"}],"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."}