{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.683","julian_year":2026.683,"time":"2026-09-07T12:46:08.376Z","years_from_j2000":26.683,"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-198160","name":"HD 198160","class":"a2iii_a3iii_white_giant","category":"star","object_type":"A2III+A3III white giant","mag":5.67,"mag_band":"V","abs_mag":1.256,"abs_mag_band":"V","distance_ly":248.97440633747553,"distance_method":"parallax","ra_deg":312.910215,"dec_deg":-62.429335,"epoch_ra_deg":313.467238,"epoch_dec_deg":-62.329005,"epoch_moved_arcsec":2.578,"pm_ra_mas_yr":83.04,"pm_dec_mas_yr":-49.38,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Pavo","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-198160","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"20516-6226","companions":[{"measured":2020,"magnitude":6.58,"components":"AB","discoverer_code":"RMK  26","separation_arcsec":2.4,"position_angle_deg":78}],"spectral_type":"A2III+A3III","color_index_bv":0.203,"luminosity_solar":27.390502512868633,"metallicity_fe_h":-0.85,"radial_velocity_km_s":-16,"spectral_type_source":"SIMBAD (1984ApJS...55..657C, quality C)","surface_gravity_log_g":3.98,"surface_temperature_k":7970,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":83.04,"proper_motion_dec_mas_yr":-49.38,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 198160"},{"catalog":"HIP","designation":"HIP 102962"},{"catalog":"HR","designation":"HR 7959"}],"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."}