{"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":"2026-09-03T11:49:46.821Z","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-46184","name":"HD 46184","class":"k1iii_orange_giant","category":"star","object_type":"K1III orange giant","mag":5.16,"mag_band":"V","abs_mag":-0.093,"abs_mag_band":"V","distance_ly":366.46800137702206,"distance_method":"parallax","ra_deg":97.84602000000001,"dec_deg":-12.391953,"epoch_ra_deg":98.157767,"epoch_dec_deg":-12.410622,"epoch_moved_arcsec":1.22,"pm_ra_mas_yr":42.1,"pm_dec_mas_yr":-17.87,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Canis Major","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-46184","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"06314-1224","companions":[{"measured":1998,"magnitude":13.6,"components":null,"discoverer_code":"RST3460","separation_arcsec":15.2,"position_angle_deg":296}],"spectral_type":"K1III","uncertainties":{"metallicity_fe_h":[0.15,0.15]},"color_index_bv":1.262,"luminosity_solar":94.8855326727801,"metallicity_fe_h":0.06,"radial_velocity_km_s":17,"spectral_type_source":"SIMBAD (1988MSS...C04....0H, quality C)","surface_gravity_log_g":1.68,"surface_temperature_k":4345,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":42.1,"proper_motion_dec_mas_yr":-17.87,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 46184"},{"catalog":"HIP","designation":"HIP 31084"},{"catalog":"HR","designation":"HR 2379"}],"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."}