Star in the constellation Aquila
Mu Aquilae
Observation dataEpoch J2000 Equinox J2000
Constellation
Aquila
Right ascension
19 34 05.3529
Declination
+07° 22′ 44.189″
Apparent magnitude (V)
4.45
Characteristics
Spectral type
K3-IIIb Fe0.5
U−B color index
+1.24
B−V color index
+1.176
R−I color index
0.61
Astrometry Radial velocity (Rv )−24.73±0.13 km/s Proper motion (μ) RA: +213.73 mas /yr Dec.: −156.55 mas /yr Parallax (π)30.31 ± 0.24 mas Distance 107.6 ± 0.9 ly pc ) Absolute magnitude (MV )1.80 Details Mass 1.16±0.10 M ☉ Radius 7.43±0.15 R ☉ Luminosity 24.5 L ☉ Surface gravity (log g )2.70±0.06 cgs Temperature 4,567±79 K Metallicity 0.16 dex Rotational velocity (v sin i )0.0 km/s Age 6.71±2.19 Gyr Other designations μ Aql , 38 Aql , BD +07 4132, FK5 1511, GJ 9661, HD 184406, HIP 96229, HR 7429, SAO 124799, LTT 15709 Database references SIMBAD data
Mu Aquilae , Latinized from μ Aquilae, is the Bayer designation for a single star in the equatorial constellation of Aquila . With an apparent visual magnitude of 4.45, it is visible to the naked eye. The measured annual parallax shift of this star is 30.31 mas , which gives a distance estimate of 107.6 light-years (33.0 parsecs ) from Earth. It is drifting closer with a radial velocity of −25 km/s, and displays a relatively high proper motion , traversing the celestial sphere at the rate of 0.264″ per year.
The stellar classification of Mu Aquilae is K3-IIIb Fe0.5, indicating that this is an evolved giant star with a mild overabundance of iron appearing in its spectrum . It belongs to a sub-category of giants called the red clump , which means it is generating energy through the fusion of helium at its core. Compared to the Sun, it has 116% of the mass and has expanded to 7.7 times the size. This inflated outer envelope has an effective temperature of 4,567 K and is radiating 24.5 times the Sun's luminosity. At this heat, Mu Aquilae glows with the orange hue of a K-type star . It is roughly seven billion years old.
References
^ van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics , 474 (2): 653–664, arXiv :0708.1752 , Bibcode :2007A&A...474..653V , doi :10.1051/0004-6361:20078357 , S2CID 18759600 .
^ Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory , 4 (99): 99, Bibcode :1966CoLPL...4...99J .
^ 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 .
^ Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal , 135 (1): 209–231, Bibcode :2008AJ....135..209M , doi :10.1088/0004-6256/135/1/209 , S2CID 121883397 .
^ Hekker, S.; et al. (August 2006), "Precise radial velocities of giant stars. I. Stable stars", Astronomy and Astrophysics , 454 (3): 943–949, arXiv :astro-ph/0604502 , Bibcode :2006A&A...454..943H , doi :10.1051/0004-6361:20064946 , S2CID 119529768
^ Maldonado, J.; et al. (June 2013), "The metallicity signature of evolved stars with planets", Astronomy & Astrophysics , 554 : 18, arXiv :1303.3418 , Bibcode :2013A&A...554A..84M , doi :10.1051/0004-6361/201321082 , S2CID 119289111 , A84.
Baines, Ellyn K.; Clark, James H., III; Schmitt, Henrique R.; Stone, Jordan M.; von Braun, Kaspar (2023-12-01). "33 New Stellar Angular Diameters from the NPOI, and Nearly 180 NPOI Diameters as an Ensemble" . The Astronomical Journal . 166 (6): 268. Bibcode :2023AJ....166..268B . doi :10.3847/1538-3881/ad08be . ISSN 0004-6256 . {{cite journal }}: CS1 maint: multiple names: authors list (link )
"* mu. Aql" , SIMBAD Centre de données astronomiques de Strasbourg , retrieved 2012-07-18.Eggleton, Peter; Tokovinin, A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869, arXiv :0806.2878 , Bibcode :2008MNRAS.389..869E , doi :10.1111/j.1365-2966.2008.13596.x , S2CID 14878976 .
Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)", The Astronomical Journal , 129 (3): 1483–1522, arXiv :astro-ph/0412070 , Bibcode :2005AJ....129.1483L , doi :10.1086/427854 , S2CID 2603568 .
Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity", The Astrophysical Journal , 539 (2): 732–741, arXiv :astro-ph/0003329 , Bibcode :2000ApJ...539..732A , doi :10.1086/309278 , S2CID 16673121 .
"The Colour of Stars" , Australia Telescope, Outreach and Education , Commonwealth Scientific and Industrial Research Organisation , December 21, 2004, archived from the original on March 18, 2012, retrieved 2012-01-16.
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Location of μ Aquilae (circled)
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