{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.676","julian_year":2026.676,"time":"2026-09-04T21:55:06.622Z","years_from_j2000":26.676,"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":"hip-105993","name":"HIP 105993","class":"gwl_yellow_star","category":"star","object_type":"Gwl: yellow star","mag":10.17,"mag_band":"V","abs_mag":2.716,"abs_mag_band":"V","distance_ly":1009.7719915015948,"distance_method":"parallax","ra_deg":322.005495,"dec_deg":-3.128037,"epoch_ra_deg":322.354766,"epoch_dec_deg":-3.011509,"epoch_moved_arcsec":0.819,"pm_ra_mas_yr":18.48,"pm_dec_mas_yr":-24.54,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Aquarius","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hip-105993","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":502932900,"mass_solar":2.661,"radius_solar":6.168,"spectral_type":"Gwl:","uncertainties":{"metallicity_fe_h":[0.195,0.195]},"color_index_bv":0.719,"luminosity_solar":7.138385536016626,"metallicity_fe_h":-1.53,"variable_mag_max":10.119,"variable_mag_min":10.239,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1981AJ.....86..553B, quality E)","surface_gravity_log_g":3.17,"surface_temperature_k":6249,"metallicity_fe_h_source":"Median of 4 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":18.48,"proper_motion_dec_mas_yr":-24.54,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":65.4006},"designations":[{"catalog":"HIP","designation":"HIP 105993"}],"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."}