{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.670","julian_year":2026.67,"time":"2026-09-02T17:51:20.752Z","years_from_j2000":26.67,"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-90197","name":"HD 90197","class":"g3_5v_yellow_main_sequence_star","category":"star","object_type":"G3/5V yellow main-sequence star","mag":7.12,"mag_band":"V","abs_mag":3.036,"abs_mag_band":"V","distance_ly":213.87313081122193,"distance_method":"parallax","ra_deg":156.05773499999998,"dec_deg":-24.606519,"epoch_ra_deg":156.370299,"epoch_dec_deg":-24.741845,"epoch_moved_arcsec":9.325,"pm_ra_mas_yr":-342.39,"pm_dec_mas_yr":70.77,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Hydra","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-90197","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"spectral_type":"G3/5V","uncertainties":{"metallicity_fe_h":[0.04,0.04]},"color_index_bv":0.665,"luminosity_solar":5.316183950739625,"metallicity_fe_h":-0.71,"radial_velocity_km_s":56.9,"spectral_type_source":"SIMBAD (1988MSS...C04....0H, quality D)","surface_gravity_log_g":3.67,"surface_temperature_k":5565,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":-342.39,"proper_motion_dec_mas_yr":70.77,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 90197"},{"catalog":"HIP","designation":"HIP 50941"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-01T22:58:55.274Z","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."}