Xi Scorpii

Xi Scorpii
Observation data
Epoch J2000      Equinox J2000
Constellation Scorpius
ξ Sco ABC
Right ascension 16h 04m 22.191s[1]
Declination −11° 22′ 22.60″[1]
Apparent magnitude (V) 4.17[2]
(5.16 / 4.87 / 7.30)[3]
Component D
Right ascension 16h 04m 25.9260s[4]
Declination −11° 26′ 57.778″[4]
Apparent magnitude (V) 7.43[5]
Component E
Right ascension 16h 04m 26.7188s[6]
Declination −11° 26′ 59.553″[6]
Apparent magnitude (V) 7.81[7]
Characteristics
ξ Sco ABC
Spectral type F4(V) + F6(V) + G1V[8]
U−B color index +0.00[9]
B−V color index +0.45[9]
Components DE
Spectral type K1(V) + K1(V)[10]
U−B color index +0.315[9]
B−V color index +0.75[9]
Astrometry
ξ Sco ABC
Radial velocity (Rv)−36.33±0.83[11] km/s
Proper motion (μ) RA: −63.2[1] mas/yr
Dec.: −27.0[1] mas/yr
Component D
Radial velocity (Rv)−31.96±0.13[4] km/s
Proper motion (μ) RA: −61.607[4] mas/yr
Dec.: −22.227[4] mas/yr
Parallax (π)35.8898 ± 0.0200 mas[4]
Distance90.88 ± 0.05 ly
(27.86 ± 0.02 pc)
Absolute magnitude (MV)4.47[12]
Component E
Radial velocity (Rv)−32.28±0.12[6] km/s
Proper motion (μ) RA: −56.334[6] mas/yr
Dec.: −20.357[6] mas/yr
Parallax (π)35.8718 ± 0.0237 mas[6]
Distance90.92 ± 0.06 ly
(27.88 ± 0.02 pc)
Absolute magnitude (MV)5.18[12]
Orbit[3]
Primaryξ Sco A
Companionξ Sco B
Period (P)45.90±0.60 yr
Semi-major axis (a)0.654±0.006″
Eccentricity (e)0.744±0.001
Inclination (i)34.5±1.0°
Longitude of the node (Ω)25.3±4.0°
Periastron epoch (T)B 1997.22±0.02
Argument of periastron (ω)
(secondary)		163.8±5.0°
Orbit[3]
Primaryξ Sco AB
Companionξ Sco C
Period (P)1514.43 yr
Semi-major axis (a)7.755″
Eccentricity (e)0.041
Inclination (i)131.5°
Longitude of the node (Ω)47.4°
Periastron epoch (T)B 2226.10
Argument of periastron (ω)
(secondary)		59.3°
Details
D
Mass0.89[4] M☉
Radius0.94[4] R☉
Luminosity0.71[4] L☉
Surface gravity (log g)4.49[13] cgs
Temperature5,529[13] K
Age2.3[14] Gyr
E
Mass0.88[6] M☉
Radius0.77[6] R☉
Luminosity0.44[6] L☉
Surface gravity (log g)4.54[13] cgs
Temperature5,217[13] K
Age2.3[14] Gyr
Other designations
Components ABC: ξ Sco, BD−10°4237, GJ 9540, HIP 78727, SAO 159665 (only AB), ADS 9909
ξ Sco A: HD 144070, HR 5978
ξ Sco B: HD 144069, HR 5977
ξ Sco C: SAO 159666
Other designations
Components DE: GJ 9541, ADS 9910
Component D: BD−11°4057, HD 144087, HIP 78738, SAO 159668
Component E: BD−11°4058, HD 144088, HIP 78739, SAO 159670
Database references
SIMBADξ Sco ABC
ξ Sco AB
ξ Sco A
ξ Sco B
ξ Sco C
Component D
Component E
ARICNSξ Sco A
ξ Sco B
ξ Sco C

Xi Scorpii (ξ Sco) is part of a quintuple star system in the constellation Scorpius. It was assigned this designation by Bayer, although Ptolemy had catalogued the star in Libra. Flamsteed assigned it the designation 51 Librae, but this has fallen out of use since modern constellation boundaries assign the star to Scorpius.[15]

  1. ^ a b c d Roeser, S.; Bastian, U. (1988). "A new star catalogue of SAO type". Astronomy and Astrophysics Supplement Series. 74: 449–451. Bibcode:1988A&AS...74..449R.
  2. ^ "* ksi Sco". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2 August 2017.
  3. ^ a b c "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 1 August 2017. Retrieved 2 July 2017.
  4. ^ a b c d e f g h i 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.
  5. ^ "HD 144087". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2 August 2017.
  6. ^ a b c d e f g h i 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.
  7. ^ "HD 144088". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2 August 2017.
  8. ^ Skiff, B. A. (2014). "VizieR Online Data Catalog: Catalogue of Stellar Spectral Classifications". VizieR On-line Data Catalog. 1. Bibcode:2014yCat....1.2023S.
  9. ^ a b c d Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
  10. ^ Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5". Michigan Spectral Survey. 5: 0. Bibcode:1999MSS...C05....0H.
  11. ^ Tokovinin, A. A.; Smekhov, M. G. (2002). "Statistics of spectroscopic sub-systems in visual multiple stars". Astronomy & Astrophysics. 382: 118–123. Bibcode:2002A&A...382..118T. doi:10.1051/0004-6361:20011586.
  12. ^ a b Boro Saikia, S.; et al. (2018). "Chromospheric activity catalogue of 4454 cool stars. Questioning the active branch of stellar activity cycles". Astronomy and Astrophysics. 616: A108. arXiv:1803.11123. Bibcode:2018A&A...616A.108B. doi:10.1051/0004-6361/201629518. S2CID 118915212.
  13. ^ a b c d Stassun, Keivan G.; et al. (9 September 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. eISSN 1538-3881.
  14. ^ a b Stanford-Moore, S. Adam; Nielsen, Eric L.; De Rosa, Robert J.; MacIntosh, Bruce; Czekala, Ian (2020). "BAFFLES: Bayesian Ages for Field Lower-mass Stars". The Astrophysical Journal. 898 (1): 27. arXiv:2006.04811. Bibcode:2020ApJ...898...27S. doi:10.3847/1538-4357/ab9a35.
  15. ^ Cite error: The named reference Wagman was invoked but never defined (see the help page).