{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T19:54:42.442Z","years_from_j2000":26.681,"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-17051","name":"ι Hor","class":"f8v_yellow_white_main_sequence_star","category":"star","object_type":"F8V yellow-white main-sequence star","mag":5.4,"mag_band":"V","abs_mag":4.226,"abs_mag_band":"V","distance_ly":55.99256998814421,"distance_method":"parallax","ra_deg":40.638974999999995,"dec_deg":-50.800294,"epoch_ra_deg":40.869767,"epoch_dec_deg":-50.683876,"epoch_moved_arcsec":10.653,"pm_ra_mas_yr":333.73,"pm_dec_mas_yr":219.21,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Horologium","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-17051","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":5373447400,"mass_solar":1.077,"radius_solar":1.215,"spectral_type":"F8V","uncertainties":{"metallicity_fe_h":[0.082,0.082]},"color_index_bv":0.561,"luminosity_solar":1.7766423082036151,"metallicity_fe_h":0.153,"radial_velocity_km_s":15.5,"spectral_type_source":"SIMBAD (2006A&A...460..695T, quality C)","surface_gravity_log_g":4.244,"surface_temperature_k":6006,"metallicity_fe_h_source":"Median of 16 spectroscopic determinations in 17 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":333.73,"proper_motion_dec_mas_yr":219.21,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":1.7414},"designations":[{"catalog":"Bayer/Flamsteed","designation":"Iota Hor"},{"catalog":"Gliese","designation":"Gl 108"},{"catalog":"HD","designation":"HD 17051"},{"catalog":"HIP","designation":"HIP 12653"},{"catalog":"HR","designation":"HR 810"}],"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."}