{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.672","julian_year":2026.672,"time":"2026-09-03T14:11:03.915Z","years_from_j2000":26.672,"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-99211","name":"15 γ Crt","class":"a7v_n_white_main_sequence_star","category":"star","object_type":"A7V(n) white main-sequence star","mag":4.06,"mag_band":"V","abs_mag":2.05,"abs_mag_band":"V","distance_ly":82.3212174229506,"distance_method":"parallax","ra_deg":171.22053,"dec_deg":-17.68401,"epoch_ra_deg":171.555934,"epoch_dec_deg":-17.831449,"epoch_moved_arcsec":2.589,"pm_ra_mas_yr":-97.01,"pm_dec_mas_yr":3.22,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Crater","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-99211","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"11249-1741","companions":[{"measured":2017,"magnitude":7.9,"components":null,"discoverer_code":"HJ  840","separation_arcsec":4.4,"position_angle_deg":92}],"spectral_type":"A7V(n)","color_index_bv":0.216,"luminosity_solar":13.182567385564068,"metallicity_fe_h":-0.11,"radial_velocity_km_s":1,"spectral_type_source":"SIMBAD (2006AJ....132..161G, quality C)","surface_gravity_log_g":4.07,"surface_temperature_k":7682,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":-97.01,"proper_motion_dec_mas_yr":3.22,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"15 Gamma Crt"},{"catalog":"HD","designation":"HD 99211"},{"catalog":"HIP","designation":"HIP 55705"},{"catalog":"HR","designation":"HR 4405"}],"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."}