{"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":"2026-09-05T22:41:29.129Z","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-210169","name":"HD 210169","class":"ka4hf0mf5_iii_eusrba_yellow_white_giant","category":"star","object_type":"kA4hF0mF5(III)EuSrBa yellow-white giant","mag":8.47,"mag_band":"V","abs_mag":3.004,"abs_mag_band":"V","distance_ly":404.1589585423466,"distance_method":"parallax","ra_deg":331.9401,"dec_deg":33.415714,"epoch_ra_deg":332.236589,"epoch_dec_deg":33.546696,"epoch_moved_arcsec":0.371,"pm_ra_mas_yr":-5.42,"pm_dec_mas_yr":-12.81,"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-210169","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"spectral_type":"kA4hF0mF5(III)EuSrBa","color_index_bv":0.338,"luminosity_solar":5.475200153037679,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (2020AJ....160...52M, quality D)","proper_motion_ra_mas_yr":-5.42,"proper_motion_dec_mas_yr":-12.81},"designations":[{"catalog":"HD","designation":"HD 210169"},{"catalog":"HIP","designation":"HIP 109234"}],"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."}