Alpha Scuti

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α Scuti
Scutum constellation map.png
Location of α Scuti
Observation data
Epoch J2000      Equinox J2000
Constellation Scutum
Right ascension 18h 35m 12.42776s[1]
Declination −8° 14′ 38.6529″[1]
Apparent magnitude (V) 3.83[2]
Spectral type K3III[3]
U−B color index +1.53[2]
B−V color index +1.34[2]
Radial velocity (Rv) +36.50[4] km/s
Proper motion (μ) RA: -17.00[1] mas/yr
Dec.: -313.52[1] mas/yr
Parallax (π) 16.38 ± 0.22[1] mas
Distance 199 ± 3 ly
(61.1 ± 0.8 pc)
Absolute magnitude (MV) -0.08[5]
Mass 1.33[6] M
Radius 20[6] R
Luminosity 186[5] L
Surface gravity (log g) 1.96[6] cgs
Temperature 4,315[7] K
Metallicity [Fe/H] -0.04[5] dex
Rotational velocity (v sin i) 1.7[8] km/s
Other designations
BD-08°4638, FK5 1482, GC 25385, HIP 91117, HR 6973, HD 171443, LTT 7377, NSV 11056, SAO 142408
Database references

Alpha Scuti (α Sct, α Scuti) is a fourth-magnitude star in the constellation Scutum. Alpha Scuti is an orange K-type giant[3] with an apparent magnitude of +3.83.[2] Alpha Scuti is a suspected variable star with magnitude range reported as 3.81 to 3.87.[9] It is approximately 199 light years from Earth.[1]

Alpha Scuti was a latter designation of 1 Aquilae.[10]


  1. ^ a b c d e f Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. Bibcode:2007A&A...474..653V. arXiv:0708.1752Freely accessible. doi:10.1051/0004-6361:20078357.  Vizier catalog entry
  2. ^ a b c d Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D. 
  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. ^ Massarotti, Alessandro; Latham, David W.; Stefanik, Robert P.; Fogel, Jeffrey (2008). "Rotational and Radial Velocities for a Sample of 761 Hipparcos Giants and the Role of Binarity". The Astronomical Journal. 135: 209. Bibcode:2008AJ....135..209M. doi:10.1088/0004-6256/135/1/209. 
  5. ^ a b c Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. Bibcode:2012AstL...38..331A. arXiv:1108.4971Freely accessible. doi:10.1134/S1063773712050015.  Vizier catalog entry
  6. ^ a b c 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. Bibcode:1999A&A...352..555A. arXiv:astro-ph/9911002Freely accessible.  Vizier catalog entry
  7. ^ Martínez, M. Isabel Pérez; Schröder, K.-P.; Cuntz, M. (2011). "The basal chromospheric Mg ii h+k flux of evolved stars: Probing the energy dissipation of giant chromospheres". Monthly Notices of the Royal Astronomical Society. 414: 418. Bibcode:2011MNRAS.414..418P. arXiv:1102.4832Freely accessible. doi:10.1111/j.1365-2966.2011.18421.x.  Vizier catalog entry
  8. ^ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics. 561: A126. Bibcode:2014A&A...561A.126D. arXiv:1312.3474Freely accessible. doi:10.1051/0004-6361/201220762.  Vizier catalog entry
  9. ^ Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S. 1. Bibcode:2009yCat....1.2025S. 
  10. ^ 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. 

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