Astronomy:Epsilon Sculptoris

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Short description: Binary star system in the constellation Sculptor
ε Sculptoris
Location of ε Sculptoris (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Sculptor[1]
Right ascension  01h 45m 38.75712s[2]
Declination −25° 03′ 09.4022″[2]
Apparent magnitude (V) 5.29[1]
Characteristics
A
Evolutionary stage main sequence[3]
Spectral type F2V[4]
U−B color index +0.01[5]
B−V color index +0.40[5]
B
Evolutionary stage main sequence[6]
Spectral type G9V[7]
Astrometry
Radial velocity (Rv)+13.10[8] km/s
Absolute magnitude (MV)+3.05[1]
A
Proper motion (μ) RA: +165.847[3] mas/yr
Dec.: −49.654[3] mas/yr
Parallax (π)35.6418 ± 0.0719[3] mas
Distance91.5 ± 0.2 ly
(28.06 ± 0.06 pc)
B
Proper motion (μ) RA: +138.593[9] mas/yr
Dec.: −44.200[9] mas/yr
Parallax (π)35.7514 ± 0.0313[9] mas
Distance91.23 ± 0.08 ly
(27.97 ± 0.02 pc)
Orbit[10]
Period (P)2,198.3 yr
Semi-major axis (a)17.06″
Eccentricity (e)0.857
Inclination (i)105.3°
Details
ε Scl A
Mass1.44[11] M☉
Radius1.5[12] R☉
Luminosity5.07[1] L☉
Surface gravity (log g)4.24[13] cgs
Temperature6,809[13] K
Metallicity [Fe/H]−0.02[1] dex
Rotational velocity (v sin i)86[14] km/s
Age1.6[3] Gyr
ε Scl B
Mass0.84[11] M☉
Radius0.74[15] R☉
Luminosity0.30[15] L☉
Surface gravity (log g)4.62[15] cgs
Temperature4,973[15] K
Other designations
ADS 1394, CCDM J01456-2504AB, CD−25°704, FK5 61, GC 2145, HD 10830, HIP 8209, HR 514, SAO 167275, WDS J01456-2503AB
Database references
SIMBADdata

Epsilon Sculptoris (ε Scl, ε Sculptoris) is a binary star[16] in the constellation Sculptor. It is 91 light years from Earth and has a combined apparent magnitude of +5.29.

The primary component, Epsilon Sculptoris A, is a yellow-white F-type main-sequence star[4] with an apparent magnitude of +5.34.[17] Orbiting it with a separation of 4.6 arcseconds, or at least 125 astronomical units, is Epsilon Sculptoris B, a yellow G-type main sequence dwarf with an apparent magnitude of +8.50.[18] A and B make one orbit around their centre of mass once every 1200 years.[19]

There are two optical companions, the 15th magnitude designated Epsilon Sculptoris C at an angular separation of 15 arcseconds and the 11th magnitude Epsilon Sculptoris D, at a separation of 142 arcseconds.[20] Both these faint stars have small Gaia parallaxes indicating a much greater distance than the Epsilon Sculptoris pair.[21]

The designation Epsilon Sculptoris hasn’t always been allocated to this star. It was given this designation by Lacaille when he created Sculptor. When Bode created his own constellation Machina Electrica, he took about half of Sculptor and parts of Fornax, including this star, which he designated Alpha Machinae Electricae, though the star Nu Fornacis was the brightest star. Bode used Epsilon Sculptoris for HD 344 (HR 13) instead. After Machina Electrica was deemed obsolete by the IAU, the stars were returned to their original constellations.[22]

This star will be in the constellation Fornax around 2920 CE.[23]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A  XHIP record for this object at VizieR.
  2. ↑ 2.0 2.1 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V.  Vizier catalog entry
  3. ↑ 3.0 3.1 3.2 3.3 3.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  4. ↑ 4.0 4.1 Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. (2006). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc--The Southern Sample". The Astronomical Journal 132 (1): 161–170. doi:10.1086/504637. Bibcode: 2006AJ....132..161G. 
  5. ↑ 5.0 5.1 Mermilliod, J. C. (2006). "VizieR Online Data Catalog: Homogeneous Means in the UBV System (Mermilliod 1991)". VizieR On-line Data Catalog: II/168. Originally Published in: Institut d'Astronomie 2168. Bibcode: 2006yCat.2168....0M. Vizier catalog entry
  6. ↑ Tuchow, Noah W.; Stark, Christopher C.; Mamajek, Eric (2024). "HPIC: The Habitable Worlds Observatory Preliminary Input Catalog". The Astronomical Journal 167 (3): 139. doi:10.3847/1538-3881/ad25ec. Bibcode: 2024AJ....167..139T. 
  7. ↑ Edwards, T. W. (1976). "MK classification for visual binary components". The Astronomical Journal 81: 245. doi:10.1086/111879. Bibcode: 1976AJ.....81..245E. 
  8. ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G. 
  9. ↑ 9.0 9.1 9.2 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  10. ↑ Izmailov, I. S. (2019). "The Orbits of 451 Wide Visual Double Stars". Astronomy Letters 45 (1): 30–38. doi:10.1134/S106377371901002X. Bibcode: 2019AstL...45...30I. 
  11. ↑ 11.0 11.1 Tokovinin, A.; Kiyaeva, O. (2016). "Eccentricity distribution of wide binaries". Monthly Notices of the Royal Astronomical Society 456 (2): 2070–2079. doi:10.1093/mnras/stv2825. Bibcode: 2016MNRAS.456.2070T.  Vizier catalog entry
  12. ↑ Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures". Astronomy and Astrophysics 352: 555–562. Bibcode: 1999A&A...352..555A.  Vizier catalog entry
  13. ↑ 13.0 13.1 David, Trevor J.; Hillenbrand, Lynne A. (2015). "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal 804 (2): 146. doi:10.1088/0004-637X/804/2/146. Bibcode: 2015ApJ...804..146D.  Vizier catalog entry
  14. ↑ Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H 5050. Bibcode: 1995yCat.5050....0H. 
  15. ↑ 15.0 15.1 15.2 15.3 Stassun, Keivan G. et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S. 
  16. ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E. 
  17. ↑ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355. Bibcode: 2000A&A...355L..27H. 
  18. ↑ Zacharias, N.; Finch, C. T.; Girard, T. M.; Henden, A.; Bartlett, J. L.; Monet, D. G.; Zacharias, M. I. (2012). "VizieR Online Data Catalog: UCAC4 Catalogue (Zacharias+, 2012)". Vizier Online Data Catalog. Bibcode: 2012yCat.1322....0Z. 
  19. ↑ Malkov, O. Yu.; Tamazian, V. S.; Docobo, J. A.; Chulkov, D. A. (2012). "Dynamical masses of a selected sample of orbital binaries". Astronomy & Astrophysics 546: A69. doi:10.1051/0004-6361/201219774. Bibcode: 2012A&A...546A..69M.  Vizier catalog entry
  20. ↑ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal 122 (6): 3466. doi:10.1086/323920. Bibcode: 2001AJ....122.3466M.  Vizier catalog entry
  21. ↑ Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.</ref name=dr3d>Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  22. ↑ Ian Ridpath. "Sculptor". http://www.ianridpath.com/startales/sculptor.html. 
  23. ↑ Patrick Moore; Robin Rees (2014). Patrick Moore's Data Book of Astronomy. Cambridge: Cambridge University Press. p. 296. ISBN 978-1-139-49522-6. https://books.google.com/books?id=2FNfjWKBZx8C. 



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