{"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":"2026-09-02T08:49:07.847Z","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-5516","name":"38 η And","class":"g8_iii_yellow_giant","category":"star","object_type":"G8-III yellow giant","mag":4.4,"mag_band":"V","abs_mag":0.161,"abs_mag_band":"V","distance_ly":229.68747509757364,"distance_method":"parallax","ra_deg":14.301675,"dec_deg":23.417648,"epoch_ra_deg":14.660602,"epoch_dec_deg":23.562606,"epoch_moved_arcsec":1.694,"pm_ra_mas_yr":-43.72,"pm_dec_mas_yr":-46.06,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Andromeda","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-5516","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"00572+2325","companions":[{"measured":2001,"magnitude":12.34,"components":"AB","discoverer_code":"FOX 116","separation_arcsec":129.3,"position_angle_deg":232}],"spectral_type":"G8-III","color_index_bv":0.94,"luminosity_solar":75.09309424540648,"metallicity_fe_h":-0.54,"radial_velocity_km_s":-10,"spectral_type_source":"SIMBAD (1989ApJS...71..245K, quality C)","surface_gravity_log_g":2.7,"surface_temperature_k":4925,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":-43.72,"proper_motion_dec_mas_yr":-46.06,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"38 Eta And"},{"catalog":"HD","designation":"HD 5516"},{"catalog":"HIP","designation":"HIP 4463"},{"catalog":"HR","designation":"HR 271"}],"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."}