{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.680","julian_year":2026.68,"time":"2026-09-06T06:05:05.666Z","years_from_j2000":26.68,"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-127321","name":"HD 127321","class":"g1v_yellow_main_sequence_star","category":"star","object_type":"G1V yellow main-sequence star","mag":8.14,"mag_band":"V","abs_mag":3.633,"abs_mag_band":"V","distance_ly":259.88564179761147,"distance_method":"parallax","ra_deg":217.801425,"dec_deg":-19.977799,"epoch_ra_deg":218.17849,"epoch_dec_deg":-20.09745,"epoch_moved_arcsec":1.362,"pm_ra_mas_yr":-5.51,"pm_dec_mas_yr":-50.75,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Libra","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-127321","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"14312-1959","age_years":5321025400,"companions":[{"measured":1917,"magnitude":10.6,"components":null,"discoverer_code":"ARA 698","separation_arcsec":4.2,"position_angle_deg":286}],"mass_solar":1.182,"radius_solar":1.764,"spectral_type":"G1V","color_index_bv":0.615,"luminosity_solar":3.067608976917936,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1988MSS...C04....0H, quality C)","surface_gravity_log_g":3.963,"surface_temperature_k":5962,"proper_motion_ra_mas_yr":-5.51,"proper_motion_dec_mas_yr":-50.75,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":3.507},"designations":[{"catalog":"HD","designation":"HD 127321"},{"catalog":"HIP","designation":"HIP 70991"}],"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."}