HD 17943

HD 17943, or HR 859, is a high proper-motion star in the constellation of Eridanus. It has a right ascension of 02h 52m 50.74s and a declination of −09° 26′ 28.4″. Its apparent magnitude is equal to 6.325. Based on parallax measurements from the Gaia spacecraft, it is at a distance of 306 light-years (94 parsecs). It belongs to spectral class A4V.[2][1]

HD 17943
Observation data
Epoch J2000      Equinox J2000
Constellation Eridanus
Right ascension 02h 52m 50.74s[1]
Declination −09° 26′ 28.4″[1]
Apparent magnitude (V) 6.325[2]
Characteristics
Evolutionary stage main-sequence star
Spectral type A4V[2]
Astrometry
Radial velocity (Rv)38.07±0.28[1] km/s
Proper motion (μ) RA: 109.825 mas/yr[1]
Dec.: 40.094 mas/yr[1]
Parallax (π)10.6465 ± 0.0374 mas[1]
Distance306 ± 1 ly
(93.9 ± 0.3 pc)
Absolute magnitude (MV)1.30
Other designations
BD−10 569, HD 17943, HIP 13421, HR 859, SAO 130160, TYC 5286-1109-1,[2] 33 G. Eridani
Database references
SIMBADdata

This star is incorrectly called by the Bayer designation "Sigma Eridani" in the 1991 edition of the Bright Star Catalogue. Bayer's Sigma Eridani is in fact non-existent.[3][4][5]

References
  1. Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. "HD 17943". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 13 January 2024.
  3. Johann Bayer (1603). Uranometria. p. 117.
  4. Hoffleit, D.; Warren, W. H. Jr. (November 1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". Bibcode:1995yCat.5050....0H. Remarks for HR 859
  5. Toone, John (March 2019). "Sigma Enigma. The case of sigma Eridanus" (PDF). British Astronomical Association Variable Star Section Circular (179): 18. Bibcode:2019BAAVC.179...18T.
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