Epsilon Scuti

Epsilon Scuti, Latinized from ε Scuti, is a probable astrometric binary [10] star system in the constellation Scutum. It is faintly visible to the naked eye with an apparent visual magnitude of +4.88.[2] Based upon an annual parallax shift of 6.06 mas as seen from Earth,[7] it is located approximately 540 light years from the Sun. It is moving closer to the Sun with a radial velocity of −9.8 km/s.[6] Epsilon Scuti was a latter designation of 3 Aquilae.[11]

ε Scuti
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]
Characteristics
Spectral type G8IIb[3]
U−B color index +0.88[4]
B−V color index +1.12[5]
Astrometry
Radial velocity (Rv)−9.8±0.6[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
Distanceapprox. 540 ly
(approx. 170 pc)
Absolute magnitude (MV)-1.18[2]
Details
Luminosity403[2] L☉
Surface gravity (log g)1.00[8] cgs
Temperature4,500[8] K
Metallicity [Fe/H]+0.05[2] dex
Rotational velocity (v sin i)5.1[9] km/s
Other designations
ε Sct, BD−08° 4686, FK5 702, GC 25610, HD 173009, HIP 91845, HR 7032, SAO 142546, ADS 11601, CCDM J18435-0817A, WDS J18435-0817A, GSC 05692-02504
Database references
SIMBADdata

The visible component is a yellow-hued bright giant with a G-type bright giant[3] It is radiating 403[2] times the Sun's luminosity from its photosphere at an effective temperature of 4,500 K.[8] Epsilon Scuti has at least three faint visual 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.[12]

References
  1. 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. 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. Vizier catalog entry
  3. 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. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  7. Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  8. Soubiran, Caroline; Le Campion, Jean-François; Brouillet, Nathalie; Chemin, Laurent (2016). "The PASTEL catalogue: 2016 version". Astronomy & Astrophysics. 591: A118. arXiv:1605.07384. 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. arXiv:astro-ph/0608248. Bibcode:1999A&AS..139..433D. doi:10.1051/aas:1999401. Vizier catalog entry
  10. 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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
  11. Wagman, M. (August 1987). "Flamsteed's Missing Stars". Journal for the History of Astronomy. 18 (3): 212. Bibcode:1987JHA....18..209W. doi:10.1177/002182868701800305.
  12. 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
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