69 Aquilae

Star in the constellation Aquila

69 Aquilae  Observation data
Epoch J2000 Equinox J2000

Constellation | Aquila
Right ascension | 20h 29m 38.99995s[1]
Declination | −02° 53′ 07.9176″[1]
Apparent magnitude (V) | 4.91[2]
Characteristics
Evolutionary stage | giant[3]
Spectral type | K1/2 III[4]
B−V color index | 1.162[3]
Astrometry
Radial velocity (Rv)| −22.51±0.16[1] km/s
Proper motion (μ)|  RA: +70.355[1] mas/yr
Dec.: –21.523[1] mas/yr
Parallax (π)| 16.2388±0.2271 mas[1]
Distance| 201 ± 3 ly
(61.6 ± 0.9 pc)
Absolute magnitude (MV)| 0.97[2]
Details[3]
Mass| 1.54[5] M☉
Radius| 11 R☉
Luminosity| 45.7 L☉
Surface gravity (log g)| 2.5 cgs
Temperature| 4,529±5 K
Metallicity [Fe/H]| 0.03 dex
Rotational velocity (v sin i)| 4.0 km/s
Age| 3.44[5] Gyr
Other designations

69 Aql, BD−03° 4918, HD 195135, HIP 101101, HR 7831, SAO 144495[6]

Database references
SIMBAD| data

69 Aquilae, abbreviated 69 Aql, is a star in the equatorial constellation of Aquila. 69 Aquilae is its Flamsteed designation. It is visible to the naked eye with an apparent visual magnitude of 4.91.[2] Based upon an annual parallax shift of 16.2 mas,[1] it is located 201 light years away. The star is moving closer to the Earth with a heliocentric radial velocity of −22.5 km/s.[1]

The stellar classification of 69 Aquilae is K1/2 III,[4] which means this is an evolved giant star. It belongs to a sub-category called the red clump, indicating that it is on the horizontal branch and is generating energy through helium fusion at its core.[7] The star is about 3.4 billion years old with 1.54[5] times the mass of the Sun and has expanded to 11 times the Sun's radius.[3] It is radiating 45.7 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,529 K.[3]

## References

[edit]

1. ^ a b c d e f g h Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051.
2. ^ a b c 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, S2CID 119257644.
3. ^ a b c d e 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 121883397.209-231&rft.date=2008-01&rft_id=https://api.semanticscholar.org/CorpusID:121883397#id-name=S2CID&rft_id=info:doi/10.1088/0004-6256/135/1/209&rft_id=info:bibcode/2008AJ....135..209M&rft.aulast=Massarotti&rft.aufirst=Alessandro&rft.au=Latham,+David+W.&rft.au=Stefanik,+Robert+P.&rft.au=Fogel,+Jeffrey&rfr_id=info:sid/en.wikipedia.org:69+Aquilae" class="Z3988">
4. ^ a b Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars", Michigan Spectral Survey, 5, Bibcode:1999MSS...C05....0H.
5. ^ a b c Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal, 150 (3): 23, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114.
6. ^ "69 Aql". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved November 1, 2018.
7. ^ 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 16673121.732-741&rft.date=2000-08&rft_id=info:arxiv/astro-ph/0003329&rft_id=https://api.semanticscholar.org/CorpusID:16673121#id-name=S2CID&rft_id=info:doi/10.1086/309278&rft_id=info:bibcode/2000ApJ...539..732A&rft.aulast=Alves&rft.aufirst=David+R.&rfr_id=info:sid/en.wikipedia.org:69+Aquilae" class="Z3988">

* v
* t
* e

Constellation of Aquila

* Aquila in Chinese astronomy
* List of stars in Aquila

Stars|

| Bayer|

* α (Altair)
* β (Alshain)
* γ (Tarazed)
* δ
* ε
* ζ (Okab)
* η
* θ (Tseen Foo)
* ι
* κ
* λ
* μ
* ν
* ξ (Libertas)
* ο
* π
* σ
* τ
* υ
* φ
* χ
* ψ
* ω1
* ω2
* A
* b
* c
* d
* e
* f
* g
* h
* i
* k
* l

|

Flamsteed|

* 4
* 5
* 7
* 8
* 10
* 11
* 18
* 19
* 20
* 21
* 22
* 23
* 24
* 42
* 45
* 46
* 51
* 56
* 57
* 58
* 62
* 64
* 66
* 68
* 69
* 70
* 14 Sge
* 62 Ser
* 64 Sgr

Variable|

* R
* U
* V
* W
* TT
* FF
* QS
* V368
* V450
* V500
* V603
* V604
* V605
* V606
* V923
* V1286
* V1291
* V1298
* V1302
* V1315
* V1333
* V1339
* V1427
* V1428
* V1429
* V1472
* V1487
* V1494
* V1654
* V1672
* V1691
* V1703 (Phoenicia)
* V1828
* V1936

HR|

* 7099
* 7143
* 7288
* 7300
* 7307
* 7396
* 7456
* 7569
* 7598
* 7599
* 7693
* 7717
* 7803

HD|

* 179079
* 183263
* 187734
* 192699 (Chechia)

Other|

* CoRoT-2
* CoRoT-3
* CoRoT-8
* Gaia BH3
* HAT-P-41
* PSR J1856+0245
* PSR J1903+0327
* PSR B1913+16 (Hulse–Taylor)
* PSR J1951+1123
* SGR 1900+14
* SS 433
* W43A
* W49-2
* WASP-80 (Petra)
* WD J1953−1019
* ZTF J1901+1458

| Exoplanets|

* CoRoT-2b
* CoRoT-3b
* CoRoT-8b
* CoRoT-10b
* HD 179079 b
* HD 183263 b
* c
* HD 192263 b
* HD 192699 b
* ξ Aquilae b

|

| Star clusters|

* NGC 6709
* NGC 6738
* NGC 6755
* NGC 6756
* NGC 6760

|

Nebulae|

| NGC|

* 6741
* 6751
* 6778
* 6781
* 6790

|

Other|

* Abell 48
* Abell 70
* E Nebula
* Hen 2-428
* HESS J1857+026
* Kesteven 75
* Smith's Cloud
* W43
* W49
* W49B
* W50

Galaxies|

| NGC|

* 6814

|

Other|

* IC 1327

Category
*[RA:]: Right Ascension
*[Dec.:]: Declination
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