{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.675","julian_year":2026.675,"time":"2026-09-04T15:13:34.226Z","years_from_j2000":26.675,"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-307727","name":"HD 307727","class":"k6_v_k_orange_star","category":"star","object_type":"K6+V(k) orange star","mag":9.5,"mag_band":"V","abs_mag":7.394,"abs_mag_band":"V","distance_ly":86.03450778325573,"distance_method":"parallax","ra_deg":156.69898500000002,"dec_deg":-62.902567,"epoch_ra_deg":156.91888,"epoch_dec_deg":-63.041688,"epoch_moved_arcsec":12.052,"pm_ra_mas_yr":-285.89,"pm_dec_mas_yr":-349.84,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Carina","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-307727","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"10268-6254","age_years":5022760000,"companions":[{"measured":2015,"magnitude":11.06,"components":"AB","discoverer_code":"HDS1501","separation_arcsec":4,"position_angle_deg":340}],"mass_solar":0.68,"radius_solar":0.64,"spectral_type":"K6+V(k)","color_index_bv":1.23,"luminosity_solar":0.09602846792093805,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (2006AJ....132..161G, quality C)","surface_gravity_log_g":4.656,"surface_temperature_k":4302,"proper_motion_ra_mas_yr":-285.89,"proper_motion_dec_mas_yr":-349.84,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":0.1275},"designations":[{"catalog":"HD","designation":"HD 307727"},{"catalog":"HIP","designation":"HIP 51138"}],"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."}