{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.673","julian_year":2026.673,"time":"2026-09-03T19:07:11.488Z","years_from_j2000":26.673,"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-79452","name":"HD 79452","class":"g6iii_yellow_giant","category":"star","object_type":"G6III yellow giant","mag":5.98,"mag_band":"V","abs_mag":0.41,"abs_mag_band":"V","distance_ly":424.1304920190759,"distance_method":"parallax","ra_deg":138.809445,"dec_deg":34.633516,"epoch_ra_deg":139.220868,"epoch_dec_deg":34.522524,"epoch_moved_arcsec":4.391,"pm_ra_mas_yr":-157.52,"pm_dec_mas_yr":47.81,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Lynx","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-79452","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"09152+3438","age_years":503121200,"companions":[{"measured":2015,"magnitude":10.99,"components":null,"discoverer_code":"BUP 126","separation_arcsec":142.9,"position_angle_deg":259}],"mass_solar":2.679,"radius_solar":8.689,"spectral_type":"G6III","uncertainties":{"metallicity_fe_h":[0.126,0.126]},"color_index_bv":0.839,"luminosity_solar":59.70352865838366,"metallicity_fe_h":-0.65,"radial_velocity_km_s":56,"spectral_type_source":"SIMBAD (1955ApJS....2..195R, quality C)","surface_gravity_log_g":2.927,"surface_temperature_k":5631,"metallicity_fe_h_source":"Median of 6 spectroscopic determinations in 9 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-157.52,"proper_motion_dec_mas_yr":47.81,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":67.349},"designations":[{"catalog":"HD","designation":"HD 79452"},{"catalog":"HIP","designation":"HIP 45412"},{"catalog":"HR","designation":"HR 3664"}],"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."}