HD 17943

HD 17943

Location of HD 17943 (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Eridanus[1]
Right ascension	02^h 52^m 50.74^s[2]
Declination	−09° 26′ 28.4″[2]
Apparent magnitude (V)	6.325[3]
Characteristics
Evolutionary stage	main-sequence star[4]
Spectral type	A4V[5]
Astrometry
Radial velocity (Rv)	38.07±0.28[2] km/s
Proper motion (μ)	RA: +109.825 mas/yr[2] Dec.: +40.094 mas/yr[2]
Parallax (π)	10.6465±0.0374 mas[2]
Distance	306 ± 1 ly (93.9 ± 0.3 pc)
Absolute magnitude (MV)	1.37[1]
Details
Mass	1.8[6] M☉
Radius	2.6[6] R☉
Luminosity	21[6] L☉
Surface gravity (log g)	3.88[6] cgs
Temperature	7,749[6] K
Metallicity [Fe/H]	−0.01[7] dex
Rotational velocity (v sin i)	134[4] km/s
Age	735[7] Myr
Other designations
BD−10 569, HD 17943, HIP 13421, HR 859, SAO 130160, TYC 5286-1109-1,[8] 33 G. Eridani[9]
Database references
SIMBAD	data

HD 17943, or HR 859, is a high proper-motion star in the constellation of Eridanus. It has an apparent magnitude of 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.

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; he assigned this designation to a 4th-magnitude-star near Eta Eridani, on the opposite side to Rho Eridani, but no naked-eye star is found in that position in modern star atlases.^[10][11][12]

References

1. Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015.
2. 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.
3. Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355. Bibcode:2000A&A...355L..27H.
4. Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691.
5. Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5". Michigan Spectral Survey. 5. Bibcode:1999MSS...C05....0H.
6. Stassun, Keivan G.; et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467.
7. Gontcharov, G. A. (2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771. arXiv:1606.08814. Bibcode:2012AstL...38..771G. doi:10.1134/S1063773712120031.
8. "HD 17943". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 13 January 2024.
9. Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.
10. Johann Bayer (1603). Uranometria. p. 117.
11. Hoffleit, D.; Warren, W. H. Jr. (November 1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". Vizier Online Data Catalog. Bibcode:1995yCat.5050....0H. Remarks for HR 859
12. Toone, John (March 2019). "Sigma Enigma. The case of sigma Eridanus" (PDF). British Astronomical Association Variable Star Section Circular. 179 (179): 18. Bibcode:2019BAAVC.179...18T.