Epsilon Scuti

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ε Scuti
Scutum constellation map.svg
Red circle.svg

Location of ε Scuti (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Scutum
Right ascension 18h 43m 31.252s[1]
Declination −8° 16′ 30.80″[1]
Apparent magnitude (V) 4.88[2]
Spectral type G8IIb[3]
U−B color index +0.88[4]
B−V color index +1.12[5]
Radial velocity (Rv) -9.80[6] km/s
Proper motion (μ) RA: +21.06[7] mas/yr
Dec.: +9.11[7] mas/yr
Parallax (π) 6.06 ± 0.64[7] mas
Distance approx. 540 ly
(approx. 170 pc)
Absolute magnitude (MV) -1.18[2]
Luminosity 403[2] L
Surface gravity (log g) 1.00[8] cgs
Temperature 4,500[8] K
Metallicity [Fe/H] +0.05[2] dex
Rotational velocity (v sin i) 5.1[9] km/s
Other designations
ADS 11601, BD-08°4686, CCDM J18435-0817A, FK5 702, GC 25610, GSC 05692-02504, HIP 91845, HR 7032, HD 173009, SAO 142546, WDS J18435-0817A
Database references

Epsilon Scuti (ε Sct, ε Scuti) is a star system in the constellation Scutum. It is approximately 540 light years from Earth.[7]

The primary component, Epsilon Scuti A, is a yellow G-type bright giant[3] with an apparent magnitude of +4.88.[2] It has at least three faint companions, two 14th magnitude stars, B and D, separated from the primary by 13.6 and 15.4 arcseconds respectively, and the 13th magnitude C, which is 38 arcseconds away.[10]

Epsilon Scuti was a latter designation of 3 Aquilae.[11]


  1. ^ a b 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: L27. Bibcode:2000A&A...355L..27H. 
  2. ^ a b c d e Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971Freely accessible. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015.  Vizier catalog entry
  3. ^ a b Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". The Astrophysical Journal Supplement Series. 71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373. 
  4. ^ 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
  5. ^ Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers. 42: 443. Bibcode:2014JAVSO..42..443M. Vizier catalog entry
  6. ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. 
  7. ^ a b c d Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.  Vizier catalog entry
  8. ^ a b Soubiran, Caroline; Le Campion, Jean-François; Brouillet, Nathalie; Chemin, Laurent (2016). "The PASTEL catalogue: 2016 version". Astronomy & Astrophysics. 591: A118. arXiv:1605.07384Freely accessible. Bibcode:2016A&A...591A.118S. doi:10.1051/0004-6361/201628497. 
  9. ^ De Medeiros, J. R.; Mayor, M. (1999). "A catalog of rotational and radial velocities for evolved stars". Astronomy and Astrophysics Supplement Series. 139 (3): 433. Bibcode:1999A&AS..139..433D. doi:10.1051/aas:1999401.  Vizier catalog entry
  10. ^ 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. Bibcode:2001AJ....122.3466M. doi:10.1086/323920.  Vizier catalog entry
  11. ^ Wagman, M. (August 1987). "Flamsteed's Missing Stars". Journal for the History of Astronomy, Vol.18, NO. 3/AUG, P.209, 1987. 18: 212. Bibcode:1987JHA....18..209W. doi:10.1177/002182868701800305.