{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.671","julian_year":2026.671,"time":"2026-09-02T22:28:17.095Z","years_from_j2000":26.671,"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-216879","name":"HD 216879","class":"ka5hf1mf4_iii_yellow_white_giant","category":"star","object_type":"kA5hF1mF4(III) yellow-white giant","mag":7.38,"mag_band":"V","abs_mag":1.038,"abs_mag_band":"V","distance_ly":605.1140137013414,"distance_method":"parallax","ra_deg":344.098785,"dec_deg":22.955894,"epoch_ra_deg":344.425083,"epoch_dec_deg":23.099122,"epoch_moved_arcsec":1.479,"pm_ra_mas_yr":55.37,"pm_dec_mas_yr":-3.29,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Pegasus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-216879","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"22564+2257","companions":[{"measured":2017,"magnitude":8.82,"components":null,"discoverer_code":"COU 240","separation_arcsec":0.8,"position_angle_deg":289}],"spectral_type":"kA5hF1mF4(III)","color_index_bv":0.393,"luminosity_solar":33.48112173860538,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (2020AJ....160...52M, quality D)","surface_temperature_k":6998,"proper_motion_ra_mas_yr":55.37,"proper_motion_dec_mas_yr":-3.29,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 216879"},{"catalog":"HIP","designation":"HIP 113282"}],"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."}