{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.674","julian_year":2026.674,"time":"2026-09-04T05:49:59.203Z","years_from_j2000":26.674,"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-198327","name":"HD 198327","class":"m4_red_star","category":"star","object_type":"M4 red star","mag":8.73,"mag_band":"V","abs_mag":-0.618,"abs_mag_band":"V","distance_ly":2415.973035393649,"distance_method":"parallax","ra_deg":309.93033,"dec_deg":80.49997,"epoch_ra_deg":309.575043,"epoch_dec_deg":80.593793,"epoch_moved_arcsec":0.161,"pm_ra_mas_yr":-5.23,"pm_dec_mas_yr":-2.99,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Draco","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-198327","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"20397+8030","companions":[{"measured":1991,"magnitude":9.61,"components":null,"discoverer_code":"HDS2946","separation_arcsec":0.2,"position_angle_deg":143}],"spectral_type":"M4","color_index_bv":1.666,"luminosity_solar":153.88631498199555,"variable_mag_max":8.559,"variable_mag_min":9.039,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1956PMcCO..13a...0B, quality D)","proper_motion_ra_mas_yr":-5.23,"proper_motion_dec_mas_yr":-2.99},"designations":[{"catalog":"HD","designation":"HD 198327"},{"catalog":"HIP","designation":"HIP 101960"}],"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."}