{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.679","julian_year":2026.679,"time":"2026-09-06T04:20:27.247Z","years_from_j2000":26.679,"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-135379","name":"β Cir","class":"a3va_white_main_sequence_star","category":"star","object_type":"A3Va white main-sequence star","mag":4.07,"mag_band":"V","abs_mag":1.645,"abs_mag_band":"V","distance_ly":99.65055808379662,"distance_method":"parallax","ra_deg":229.37875499999998,"dec_deg":-58.801208,"epoch_ra_deg":229.907636,"epoch_dec_deg":-58.9008,"epoch_moved_arcsec":4.467,"pm_ra_mas_yr":-98.39,"pm_dec_mas_yr":-135.46,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Circinus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-135379","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"15175-5848","companions":[{"measured":2016,"magnitude":13.21,"components":null,"discoverer_code":"SML   1","separation_arcsec":217.6,"position_angle_deg":199}],"spectral_type":"A3Va","uncertainties":{"metallicity_fe_h":[0.04,0.04]},"color_index_bv":0.088,"luminosity_solar":19.14255925021086,"metallicity_fe_h":0.16,"radial_velocity_km_s":9.6,"spectral_type_source":"SIMBAD (2006AJ....132..161G, quality C)","surface_gravity_log_g":4.21,"surface_temperature_k":8680,"metallicity_fe_h_source":"Median of 2 spectroscopic determinations in 4 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-98.39,"proper_motion_dec_mas_yr":-135.46,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"Beta Cir"},{"catalog":"Gliese","designation":"Gl 580.1"},{"catalog":"HD","designation":"HD 135379"},{"catalog":"HIP","designation":"HIP 74824"},{"catalog":"HR","designation":"HR 5670"}],"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."}