{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.683","julian_year":2026.683,"time":"2026-09-07T11:19:04.806Z","years_from_j2000":26.683,"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-291725","name":"HD 291725","class":"g0_yellow_star","category":"star","object_type":"G0 yellow star","mag":9.42,"mag_band":"V","abs_mag":4.683,"abs_mag_band":"V","distance_ly":288.88974999882834,"distance_method":"parallax","ra_deg":97.96422000000001,"dec_deg":0.649858,"epoch_ra_deg":98.30839,"epoch_dec_deg":0.630403,"epoch_moved_arcsec":6.591,"pm_ra_mas_yr":-234.91,"pm_dec_mas_yr":-76.32,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Monoceros","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-291725","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"06319+0039","age_years":2880578800,"companions":[{"measured":2016,"magnitude":14.27,"components":null,"discoverer_code":"GIC  62","separation_arcsec":436.5,"position_angle_deg":252}],"mass_solar":0.996,"radius_solar":0.943,"spectral_type":"G0","uncertainties":{"metallicity_fe_h":[0.125,0.125]},"color_index_bv":0.657,"luminosity_solar":1.1662724050819646,"metallicity_fe_h":-0.415,"radial_velocity_km_s":73.7,"spectral_type_source":"SIMBAD (1995A&AS..110..367N, quality E)","surface_gravity_log_g":4.397,"surface_temperature_k":5705,"metallicity_fe_h_source":"Median of 2 spectroscopic determinations in 3 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-234.91,"proper_motion_dec_mas_yr":-76.32,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":0.8467},"designations":[{"catalog":"HD","designation":"HD 291725"},{"catalog":"HIP","designation":"HIP 31127"}],"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."}