{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.679","julian_year":2026.679,"time":"2026-09-05T20:10:12.655Z","years_from_j2000":26.679,"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-107328","name":"16 Vir","class":"k0_5iiibfe_0_5_orange_giant","category":"star","object_type":"K0.5IIIbFe-0.5 orange giant","mag":4.97,"mag_band":"V","abs_mag":0.094,"abs_mag_band":"V","distance_ly":307.98522744501054,"distance_method":"parallax","ra_deg":185.08741500000002,"dec_deg":3.312574,"epoch_ra_deg":185.428759,"epoch_dec_deg":3.162985,"epoch_moved_arcsec":8.016,"pm_ra_mas_yr":-293.82,"pm_dec_mas_yr":-62.85,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Virgo","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-107328","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"12203+0319","companions":[{"measured":2015,"magnitude":12.9,"components":null,"discoverer_code":"BUP 141","separation_arcsec":2.3,"position_angle_deg":13}],"spectral_type":"K0.5IIIbFe-0.5","uncertainties":{"metallicity_fe_h":[0.114,0.114]},"color_index_bv":1.172,"luminosity_solar":79.87300061113133,"metallicity_fe_h":-0.33,"radial_velocity_km_s":36,"spectral_type_source":"SIMBAD (1989ApJS...71..245K, quality B)","surface_gravity_log_g":2.15,"surface_temperature_k":4390,"metallicity_fe_h_source":"Median of 5 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":-293.82,"proper_motion_dec_mas_yr":-62.85,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"16 Vir"},{"catalog":"HD","designation":"HD 107328"},{"catalog":"HIP","designation":"HIP 60172"},{"catalog":"HR","designation":"HR 4695"}],"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."}