5 Tauri

Short description: Binary star system in the constellation Taurus

5 Tauri

Location of 5 Tauri (circled in red)

Observation data
Equinox J2000.0]] (ICRS)
Constellation | Taurus
Right ascension |  03h 30m 52.38296s[1]
Declination | +12° 56′ 12.0489″[1]
Apparent magnitude (V) | +4.14[2]
Characteristics
Spectral type | K0-III[3]
U−B color index | +0.95[4]
B−V color index | +1.09[4]
Astrometry
Radial velocity (Rv)| 14.2±0.3[2] km/s
Proper motion (μ)|  RA: 13.537[1] mas/yr
Dec.: -2.037[1] mas/yr
Parallax (π)| 6.1081 ± 0.3907[1] mas
Distance| 530 ± 30 ly
(160 ± 10 pc)
Absolute magnitude (MV)| −0.96[2]
Orbit[5]
Primary| 5 Tauri A
Companion| 5 Tauri B
Period (P)| 960 days
Semi-major axis (a)| 4.25 mas[6]
Eccentricity (e)| 0.397±0.016
Inclination (i)| 36.95[6]°
Longitude of the node (Ω)| 207.61[6]°
Periastron epoch (T)| 2,414,889.565±5.82
Argument of periastron (ω)
(secondary)| 326.32±2.99°
Semi-amplitude (K1)
(primary)| 8.25±0.15 km/s
Details
5 Tauri A
Mass| 4.0±0.7[7] M☉
Radius| 8.5[8] R☉
Luminosity| 329.38[2] L☉
Surface gravity (log g)| 1.97[9] cgs
Temperature| 4,644[9] K
Metallicity [Fe/H]| 0.05[9] dex
Rotational velocity (v sin i)| 10[10] km/s
5 Tauri B
Mass| 1.13±0.13 M☉
Other designations

f Tau, 5 Tau, BD+12°486, FK5 125, GC 4184, HD 21754, HIP 16369, HR 1066, SAO 93469, TYC 656-1725-1[11]

Database references
SIMBAD| data

5 Tauri is a binary star[6] in the zodiac constellation of Taurus, located approximately 530 light years from the Sun. It is visible to the naked eye as a faint orange-hued star with an apparent visual magnitude of +4.14. It is moving further from the Earth with a heliocentric radial velocity of +14 km/s.[2]

This is a spectroscopic binary with a period of 960 days and an eccentricity of about 0.4.[5] The primary component is a K-type giant with a stellar classification of K0-III.[3] It has four times the mass of the Sun[7] and is radiating 329 times the Sun's luminosity from its photosphere[2] at an effective temperature of 4,644 K.[9]

## 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 2.3 2.4 2.5 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
3. ↑ 3.0 3.1 Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series 71: 245. doi:10.1086/191373. Bibcode: 1989ApJS...71..245K.
4. ↑ 4.0 4.1 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode: 1986EgUBV........0M.
5. ↑ 5.0 5.1 Harper, W. E. (June 1924). "The orbit of the spectroscopic binary 5 Tauri". Publications of the Dominion Observatory Ottawa 3: 145–149. Bibcode: 1924PDAO....3..145H.
6. ↑ 6.0 6.1 6.2 6.3 ESA (1997). "The Hipparcos and Tycho Catalogues". VizieR On-line Data Catalog. Bibcode: 1997yCat.1239....0E.
7. ↑ 7.0 7.1 Pourbaix, D.; Boffin, H. M. J. (February 2003), "Reprocessing the Hipparcos Intermediate Astrometric Data of spectroscopic binaries. II. Systems with a giant component", Astronomy and Astrophysics 398 (3): 1163–1177, doi:10.1051/0004-6361:20021736, Bibcode: 2003A&A...398.1163P
8. ↑ Pasinetti Fracassini, L. E. et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics 367: 521–524, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P.
9. ↑ 9.0 9.1 9.2 9.3 Earle Luck, R. (2014). "Parameters and Abundances in Luminous Stars". The Astronomical Journal 147 (6): 137. doi:10.1088/0004-6256/147/6/137. Bibcode: 2014AJ....147..137L.
10. ↑ Bernacca, P. L.; Perinotto, M. (1970). "A catalogue of stellar rotational velocities". Contributi Osservatorio Astronomico di Padova in Asiago 239 (1): 1. Bibcode: 1970CoAsi.239....1B.
11. ↑ "5 Tau". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=5+Tau.

## External links

* "HD 21754 -- Spectroscopic binary". SIMBAD Astronomical Database. http://simbad.u-strasbg.fr/sim-id.pl?protocol=html&Ident=5+tauri.

* v
* t
* e

Stars of Taurus

Bayer|

* α (Aldebaran)
* β (Elnath)
* γ (Prima Hyadum)
* δ1 (Secunda Hyadum)
* δ2
* δ3
* ε (Ain)
* ζ (Tianguan)
* η (Alcyone)
* θ1
* θ2
* ι
* κ1
* κ2
* λ
* μ
* ν
* ξ
* ο
* π
* ρ
* σ1
* σ2
* τ
* υ
* φ
* χ
* ψ
* ω1
* ω2

Flamsteed|

* 4 (s)
* 5 (f)
* 6 (t)
* 7
* 9
* 10
* 11
* 12
* 13
* 14
* 16 (Celaeno)
* 17 (Electra)
* 18
* 19 (Taygeta)
* 20 (Maia)
* 21 (Asterope)
* 22 (Asterope II)
* 23 (Merope)
* 24
* 26
* 27 (Atlas)
* 28 (Pleione)
* 29 (u)
* 30 (e)
* 31
* 32
* 33
* 36
* 37 (A1)
* 39 (A2)
* 40
* 41
* 44 (p)
* 45
* 46
* 47
* 48
* 51
* 53
* 55
* 56
* 57 (h)
* 58
* 60
* 62
* 63
* 66 (r)
* 70
* 71
* 72
* 75
* 76
* 79 (b)
* 80
* 81
* 83
* 84
* 85
* 88 (d)
* 89
* 90 (c)
* 93
* 95
* 96
* 97 (i)
* 98 (k)
* 99
* 101
* 103
* 104 (m)
* 105
* 106 (i)
* 107
* 108
* 109 (n)
* 110
* 111
* 113
* 114 (o)
* 115
* 116
* 117
* 118
* 119
* 120
* 121
* 122
* 125
* 126
* 127
* 128
* 129
* 130
* 131
* 132
* 133
* 134
* 135
* 136
* 137
* 139
* 140
* 44 Eri
* 49 Eri

Variable|

* T
* Y
* Z
* RR
* RV
* RW
* RY
* RZ
* SU
* SV
* SZ
* TU
* UX
* UZ
* VY
* XX
* XZ
* AA
* AH
* BP
* CD
* CI
* CQ
* CT
* CU
* CW
* CY
* DD
* DF
* DG
* DH
* DI
* DL
* DM
* DN
* DO
* DQ
* DR
* DS
* EQ
* EU
* FN
* FS
* FV
* GG
* GI
* GK
* GV
* HK
* HL
* HU
* IK
* V410
* V471
* V473
* V479
* V534
* V624
* V647
* V650
* V710
* V711
* V731
* V766
* V773
* V774
* V781
* V807
* V818
* V819
* V826
* V827
* V827
* V830
* V833
* V834
* V836
* V837
* V892
* V987
* V1038
* V1062
* V1116
* V1137
* V1141
* V1143
* V1156
* V1187
* V1229
* V1232
* V1241 (WX Eri)

HR|

* 1023
* 1028
* 1039
* 1067
* 1085
* 1089
* 1102
* 1103
* 1110
* 1119
* 1137
* 1159
* 1172
* 1183
* 1185
* 1188
* 1201
* 1222
* 1224
* 1233
* 1237
* 1238
* 1253
* 1254
* 1257
* 1279
* 1280
* 1284
* 1295
* 1307
* 1310
* 1315
* 1349
* 1354
* 1358
* 1360
* 1370
* 1385
* 1400
* 1402
* 1403
* 1406
* 1413
* 1425
* 1427
* 1436
* 1442
* 1445
* 1446
* 1448
* 1455
* 1477
* 1480
* 1490
* 1512
* 1517
* 1554
* 1566
* 1575
* 1585
* 1633
* 1642
* 1741
* 1750
* 1755
* 1831
* 1847
* 1860
* 1878
* 1902
* 1921
* 1929
* 1954
* 1997
* 2013
* 2074

HD|

* 21032
* 21585
* 23514
* 23712
* 24040
* 24368
* 24496
* 26292
* 27860
* 28086
* 28375
* 28678
* 29627
* 29647
* 36112
* 37124
* 38263
* 38524
* 285507

Gliese|

* Gliese 176

Other|

* 2MASS J03552337+1133437
* 2MASS J04414489+2301513
* A0535+26
* BD +24 692
* Butterfly star
* CoKu Tau/4
* Crab Pulsar
* Elias 16
* Elias 18
* GD 71
* Haro 6-37
* HBC 379
* HH 30
* HII 686
* HII 1306
* HII 1883
* HII 3163
* HL Tau 76
* HP Tau/G2
* Hubble I 4
* HZ 9
* IRAS 04239+2436
* IRAS 04248+2612
* IRAS 04325+2402
* IRAS 04381+2540
* L1489 IRS
* L1527
* L1551 IRS 5
* L1521F-IRS
* LkCa 15
* MWC 480
* PSR B0525+21
* PSR B0540+23
* PSR J0348+0432
* PSR J0538+2813
* Teide 1
* TMR-1
* TMC-1A
* WD 0346+246
* WISE 0410+1502

* List

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