{"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":"2026-09-03T06:56:59.345Z","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-102249","name":"λ Mus","class":"a7v_white_main_sequence_star","category":"star","object_type":"A7V white main-sequence star","mag":3.63,"mag_band":"V","abs_mag":0.675,"abs_mag_band":"V","distance_ly":127.15663004216047,"distance_method":"parallax","ra_deg":176.402115,"dec_deg":-66.728763,"epoch_ra_deg":176.717984,"epoch_dec_deg":-66.877596,"epoch_moved_arcsec":2.821,"pm_ra_mas_yr":-100.42,"pm_dec_mas_yr":33.21,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Musca","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-102249","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"11456-6644","companions":[{"measured":2015,"magnitude":11.4,"components":null,"discoverer_code":"HJ 4471","separation_arcsec":31.9,"position_angle_deg":271}],"spectral_type":"A7V","color_index_bv":0.16,"luminosity_solar":46.77351412871981,"radial_velocity_km_s":16,"spectral_type_source":"SIMBAD (2006AJ....132..161G, quality C)","surface_temperature_k":7889,"proper_motion_ra_mas_yr":-100.42,"proper_motion_dec_mas_yr":33.21,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"Lambda Mus"},{"catalog":"HD","designation":"HD 102249"},{"catalog":"HIP","designation":"HIP 57363"},{"catalog":"HR","designation":"HR 4520"}],"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."}