{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.667","julian_year":2026.667,"time":"2026-09-01T15:38:44.047Z","years_from_j2000":26.667,"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-546","name":"HD 546","class":"k1v_orange_dwarf","category":"star","object_type":"K1V orange dwarf","mag":8.84,"mag_band":"V","abs_mag":5.126,"abs_mag_band":"V","distance_ly":180.39611404599762,"distance_method":"parallax","ra_deg":2.45868,"dec_deg":-33.789024,"epoch_ra_deg":2.799022,"epoch_dec_deg":-33.640655,"epoch_moved_arcsec":4.18,"pm_ra_mas_yr":-68.9,"pm_dec_mas_yr":-140.78,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Sculptor","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-546","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"00098-3347","companions":[{"measured":2025,"magnitude":9.74,"components":null,"discoverer_code":"SEE   3","separation_arcsec":1,"position_angle_deg":129}],"spectral_type":"K1V","color_index_bv":0.833,"luminosity_solar":0.7755324957585902,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1982MSS...C03....0H, quality C)","surface_temperature_k":5164,"proper_motion_ra_mas_yr":-68.9,"proper_motion_dec_mas_yr":-140.78,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 546"},{"catalog":"HIP","designation":"HIP 794"}],"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."}