{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.669","julian_year":2026.669,"time":"2026-09-02T11:03:42.039Z","years_from_j2000":26.669,"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-24552","name":"HD 24552","class":"g1v_yellow_main_sequence_star","category":"star","object_type":"G1V yellow main-sequence star","mag":7.97,"mag_band":"V","abs_mag":4.645,"abs_mag_band":"V","distance_ly":150.78894270238254,"distance_method":"parallax","ra_deg":58.594305,"dec_deg":1.26162,"epoch_ra_deg":58.941355,"epoch_dec_deg":1.340227,"epoch_moved_arcsec":3.177,"pm_ra_mas_yr":22.34,"pm_dec_mas_yr":-117.01,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Taurus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-24552","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"03544+0116","age_years":5600246000,"companions":[{"measured":2016,"magnitude":13.71,"components":null,"discoverer_code":"TOK  81","separation_arcsec":15.4,"position_angle_deg":264}],"mass_solar":0.997,"radius_solar":1.032,"spectral_type":"G1V","uncertainties":{"metallicity_fe_h":[0.051,0.051]},"color_index_bv":0.631,"luminosity_solar":1.2078138351067802,"metallicity_fe_h":0,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1999MSS...C05....0H, quality C)","surface_gravity_log_g":4.399,"surface_temperature_k":5788,"metallicity_fe_h_source":"Median of 5 spectroscopic determinations in 7 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":22.34,"proper_motion_dec_mas_yr":-117.01,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":1.0723},"designations":[{"catalog":"HD","designation":"HD 24552"},{"catalog":"HIP","designation":"HIP 18261"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-01T22:58:55.274Z","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."}