{"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":"2026-09-03T02:22:11.039Z","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-190964","name":"HD 190964","class":"m0iii_red_giant","category":"star","object_type":"M0III red giant","mag":6.14,"mag_band":"V","abs_mag":-0.565,"abs_mag_band":"V","distance_ly":715.2550655180195,"distance_method":"parallax","ra_deg":301.278105,"dec_deg":51.839398,"epoch_ra_deg":301.458378,"epoch_dec_deg":51.915478,"epoch_moved_arcsec":1.238,"pm_ra_mas_yr":34.34,"pm_dec_mas_yr":31.21,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cygnus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-190964","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"spectral_type":"M0III","color_index_bv":1.601,"luminosity_solar":146.55478409559115,"radial_velocity_km_s":-56,"spectral_type_source":"SIMBAD (1990A&AS...85.1069S, quality C)","proper_motion_ra_mas_yr":34.34,"proper_motion_dec_mas_yr":31.21},"designations":[{"catalog":"HD","designation":"HD 190964"},{"catalog":"HIP","designation":"HIP 98915"},{"catalog":"HR","designation":"HR 7687"}],"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."}