{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T19:59:37.528Z","years_from_j2000":26.681,"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-83951","name":"13 LMi","class":"f3v_yellow_white_main_sequence_star","category":"star","object_type":"F3V yellow-white main-sequence star","mag":6.12,"mag_band":"V","abs_mag":2.487,"abs_mag_band":"V","distance_ly":173.7647025742608,"distance_method":"parallax","ra_deg":145.678095,"dec_deg":35.093371,"epoch_ra_deg":146.082282,"epoch_dec_deg":34.970445,"epoch_moved_arcsec":1.511,"pm_ra_mas_yr":-20,"pm_dec_mas_yr":-53,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Leo Minor","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-83951","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"09427+3506","age_years":1746852400,"companions":[{"measured":2010,"magnitude":8.31,"components":null,"discoverer_code":"TOK 530","separation_arcsec":336.7,"position_angle_deg":205}],"mass_solar":1.55,"radius_solar":2.065,"spectral_type":"F3V","uncertainties":{"metallicity_fe_h":[0.082,0.082]},"color_index_bv":0.386,"luminosity_solar":8.814547044472212,"metallicity_fe_h":0.03,"radial_velocity_km_s":-8,"spectral_type_source":"SIMBAD (1994AJ....108..271G, quality D)","surface_gravity_log_g":3.923,"surface_temperature_k":6747,"metallicity_fe_h_source":"Median of 3 spectroscopic determinations in 5 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-20,"proper_motion_dec_mas_yr":-53,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4) — low confidence: Gaia's classifier calls the source a binary, which GSP-Phot fitted as one star","bolometric_luminosity_solar":8.0229},"designations":[{"catalog":"Bayer/Flamsteed","designation":"13 LMi"},{"catalog":"HD","designation":"HD 83951"},{"catalog":"HIP","designation":"HIP 47631"},{"catalog":"HR","designation":"HR 3857"}],"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."}