Mu Aquilae
Star in the constellation Aquila
From Wikipedia, the free encyclopedia
Mu Aquilae is a single[10] star in the equatorial constellation of Aquila. Its name is a Bayer designation that is Latinized from μ Aquilae, and abbreviated Mu Aql or μ Aql. With an apparent visual magnitude of 4.45,[2] it is visible to the naked eye. The measured annual parallax shift of this star is 29.4 mas,[1] which gives a distance estimate of 110.9 light-years (34.0 parsecs) from Earth. It is drifting closer with a radial velocity of −25 km/s,[6] and displays a relatively high proper motion, traversing the celestial sphere at the rate of 0.264″ per year.[11]
 | |
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Aquila |
| Right ascension | 19h 34m 05.353s[1] |
| Declination | +07° 22′ 44.18″[1] |
| Apparent magnitude (V) | 4.45[2] |
| Characteristics | |
| Evolutionary stage | red clump[3] |
| Spectral type | K3-IIIb Fe0.5[4] |
| U−B color index | +1.24[2] |
| B−V color index | +1.176[5] |
| R−I color index | 0.61 |
| Astrometry | |
| Radial velocity (Rv) | −24.73±0.13[6] km/s |
| Proper motion (μ) | RA: +213.280 mas/yr[1] Dec.: −156.953 mas/yr[1] |
| Parallax (π) | 29.4091±0.1441 mas[1] |
| Distance | 110.9 ± 0.5 ly (34.0 ± 0.2 pc) |
| Absolute magnitude (MV) | 1.80[6] |
| Details[7] | |
| Mass | 1.16±0.10 M☉ |
| Radius | 7.43±0.15[8] R☉ |
| Luminosity | 24.5 L☉ |
| Surface gravity (log g) | 2.70±0.06 cgs |
| Temperature | 4,567±79 K |
| Metallicity [Fe/H] | 0.16 dex |
| Rotational velocity (v sin i) | 0.0[5] 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[9] | |
| Database references | |
| SIMBAD | data |
The stellar classification of Mu Aquilae is K3-IIIb Fe0.5,[4] 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.[3] 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.[7] At this heat, Mu Aquilae glows with the orange hue of a K-type star.[12] It is roughly seven billion years old.[7]