66 Andromedae

Short description: Star in the constellation Andromeda

66 Andromedae  Observation data
Equinox J2000.0]] (ICRS)

Constellation | Andromeda
Right ascension |  02h 27m 51.77815s[1]
Declination | +50° 34′ 11.9081″[1]
Apparent magnitude (V) | 6.16[2] (7.26/7.46)[3]
Characteristics
Spectral type | F4 V[3]
B−V color index | 0.435 (4.2/4.5)[3]
Astrometry
Radial velocity (Rv)| −5.3±4.3[3] km/s
Proper motion (μ)|  RA: +31.700[1] mas/yr
Dec.: −90.312[1] mas/yr
Parallax (π)| 18.2931 ± 0.0416[1] mas
Distance| 178.3 ± 0.4 ly
(54.7 ± 0.1 pc)
Absolute magnitude (MV)| 3.1±0.1/3.4±0.1[3]
Orbit[3]
Period (P)| 10.989861±0.000024 d
Semi-major axis (a)| ≥ 6.9 Gm (9.9 R☉)
Eccentricity (e)| 0.19236±0.00057
Periastron epoch (T)| 2,454,007.675±0.006 JD
Argument of periastron (ω)
(secondary)| 250.55±0.18°
Semi-amplitude (K1)
(primary)| 46.719±0.034 km/s
Semi-amplitude (K2)
(secondary)| 48.083±0.038 km/s
Details[3]
66 And A
Mass| 1.38 M☉
Radius| 1.7±0.1 R☉
Luminosity| 4.9±0.5 L☉
Surface gravity (log g)| 4.21[4] cgs
Temperature| 6,627±225[4] K
Metallicity [Fe/H]| −0.14±0.08[2] dex
Rotational velocity (v sin i)| 4.2±1.0 km/s
Age| 1.273[4] Gyr
66 And B
Radius| 1.5±0.1 R☉
Luminosity| 3.8±0.4 L☉
Rotational velocity (v sin i)| 4.4±1.0 km/s
Other designations

66 And, BD+49° 666, HD 15138, HIP 11465, HR 709, SAO 23353[5]

Database references
SIMBAD| data

66 Andromedae is a binary star[3] system in the northern constellation of Andromeda, near the northern border with Perseus. The designation is from the star catalogue of English astronomer John Flamsteed, first published in 1712. It has a combined apparent magnitude of 6.16,[2] which is near the lower limit of stars that are visible to the naked eye under good seeing conditions. An annual parallax shift of 18.3 mas[6] provides a distance estimate of 178 light years. The net radial velocity of the system is poorly constrained, but the pair appear to be moving closer to the Earth with a heliocentric radial velocity of around −5 km/s.[3]

The variable velocity of this system was reported by Reynold K. Young from the David Dunlap Observatory in 1945. This is a double-lined spectroscopic binary system with an orbital period of 11 days and an eccentricity of 0.19.[3] The two components are similar stars, each of 7th[3] magnitude, with a combined stellar classification of F4 V,[3] matching that of an F-type main sequence star. The system is around 1.3[4] billion years old and both stars are spinning slowly with a projected rotational velocity of around 4–5 km/s.[3]

## References

1. ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
2. ↑ 2.0 2.1 2.2 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
3. ↑ 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 3.11 3.12 Fekel, Francis C. et al. (April 2010), "New Precision Orbits of Bright Double-lined Spectroscopic Binaries. IV. 66 Andromedae, HR 6979, and HR 9059", The Astronomical Journal 139 (4): 1579−1591, doi:10.1088/0004-6256/139/4/1579, Bibcode: 2010AJ....139.1579F, https://repositories.lib.utexas.edu/bitstream/2152/34408/1/hr6979hr9059.pdf.
4. ↑ 4.0 4.1 4.2 4.3 David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal 804 (2): 146, doi:10.1088/0004-637X/804/2/146, Bibcode: 2015ApJ...804..146D.
5. ↑ "66 And". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=66+And.
6. ↑ van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V.

## External links

* Image 66 Andromedae

* v
* t
* e

Constellation of Andromeda

* Adhil
* Andromeda in Chinese astronomy
* List of Andromeda's satellite galaxies
* List of stars in Andromeda

Stars|

| Bayer|

* α
* β
* γ
* δ
* ε
* ζ
* η
* θ
* ι
* κ
* λ
* μ
* ν
* ξ
* ο
* π
* ρ
* σ
* τ
* υ
* φ
* χ
* ψ
* ω

|

Flamsteed|

* 2
* 3
* 4
* 5
* 6
* 7
* 8
* 9
* 10
* 11
* 12
* 13
* 14
* 15
* 18
* 22
* 23
* 26
* 28
* 32
* 36
* 39
* 41
* 44
* 45
* 47
* 49
* 51
* 55
* 56
* 58
* 59
* 60
* 62
* 63
* 64
* 65
* 66

Variable|

* R
* T
* U
* W
* Z
* RT
* RU
* RV
* RX
* SU
* SW
* TU
* TW
* WZ
* XZ
* AB
* AC
* AD
* AE
* AR
* BM
* BX
* CC
* CN
* DS
* DX
* EG
* ET
* EU
* FF
* GP
* GR
* GY
* HN
* KK
* KX
* KZ
* LL
* LP
* LQ
* OP
* OS
* OU
* PX
* QR
* QV
* QX
* V385
* V455
* V529

HD|

* 3
* 166
* 895
* 1185
* 1606
* 2421
* 2767
* 2942
* 3322
* 3346
* 4778
* 5608
* 5789/5788
* 6114
* 7853
* 8673
* 10307
* 13931
* 14622
* 15082
* 16004
* 16028
* 16175
* 217811
* 220105
* 221246
* 221776
* 222109
* 222399
* 223229
* 224365
* 224801
* 225218

Other|

* 3XMM J004232.1+411314
* 6 Persei
* ADS 48
* Groombridge 34
* HAT-P-6
* HR 178
* HR 8768
* M31-RV
* NGC 44
* NGC 82
* NGC 84
* NGC 91
* NGC 162
* NGC 464
* PA-99-N2
* Ross 248
* WASP-1
* WISE 0146+4234
* WISE J0005+3737
* WISE J004945.61+215120.0

| Exoplanets|

* 14 Andromedae b
* Upsilon Andromedae b
* c
* d
* e
* Gliese 15 Ab
* HD 13931 b
* HD 16175 b
* HAT-P-6b
* HAT-P-32b
* WASP-1b
* WASP-33b

|

| Star clusters|

* Mayall II
* NGC 206
* NGC 272
* NGC 752
* NGC 956
* NGC 7686

|

| Nebulae|

* NGC 7662

|

Galaxies|

| NGC|

* 5
* 11
* 13
* 19
* 21
* 20
* 27
* 39
* 43
* 48
* 49
* 51
* 67
* 68
* 69
* 70
* 71
* 72
* 74
* 76
* 79
* 80
* 81
* 83
* 85
* 86
* 90
* 93
* 94
* 96
* 97
* 108
* 109
* 112
* 140
* 149
* 160
* 169
* 181
* 183
* 184
* 214
* 218
* 226
* 228
* 229
* 233
* 243
* 252
* 258
* 260
* 262
* 280
* 304
* 317
* 389
* 393
* 404
* 425
* 431
* 477
* 478
* 512
* 513
* 523
* 528
* 536
* 668
* 679
* 687
* 700
* 703
* 704
* 705
* 708
* 709
* 710
* 712
* 714
* 717
* 732
* 753
* 759
* 891
* 1000
* 7640
* 7836

|

Numbered|

* I
* II
* III
* IV
* V
* VIII
* IX
* X
* XI
* XVIII
* XIX
* XXI

Other|

* 3C 66A
* 3C 66B
* Andromeda Galaxy
* Donatiello I
* Messier 32
* Messier 110

| Galaxy clusters|

* Abell 262
* NGC 68 group

|

| Astronomical events|

* GRB 101225A
* SN 1885A

|

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