Tau Cancri

Short description: Star in the constellation Cancer

Tau Cancri  Observation data
Equinox J2000.0]] (ICRS)

Constellation | Cancer
Right ascension |  09h 08m 00.04963s[1]
Declination | +29° 39′ 15.2428″[1]
Apparent magnitude (V) | +5.42[2]
Characteristics
Spectral type | G8 III[3]
U−B color index | +0.57[2]
B−V color index | +0.89[2]
Astrometry
Radial velocity (Rv)| −13.90±0.14[4] km/s
Proper motion (μ)|  RA: −32.51[1] mas/yr
Dec.: +2.79[1] mas/yr
Parallax (π)| 11.92 ± 0.39[1] mas
Distance| 274 ± 9 ly
(84 ± 3 pc)
Absolute magnitude (MV)| +0.81[5]
Details[4]
Mass| 2.42±0.09 M☉
Radius| 7.76±0.51 R☉
Luminosity| 40 L☉
Surface gravity (log g)| 3.21 cgs
Temperature| 5,153 K
Metallicity [Fe/H]| −0.06 dex
Rotational velocity (v sin i)| 1.95±0.45 km/s
Age| 620±60 Myr
Other designations

τ Cnc, 72 Cancri, BD+30° 1817, FK5 2719, HD 78235, HIP 44818, HR 3621, SAO 80650[6]

Database references
SIMBAD| data

Tau Cancri (τ Cancri) is a solitary,[3] yellow-hued star in the zodiac constellation of Cancer. With an apparent visual magnitude of +5.42,[2] it is faintly visible to the naked eye. Based upon an annual parallax shift of 11.92 mas as seen from Earth,[1] it is located around 274 light-years from the Sun.

With an age of about 620[4] million years and a stellar classification of G8 III,[3] this is a red-clump giant star,[7] which indicates that it has evolved onto the horizontal branch and is generating energy through helium fusion at its core. It is a microvariable, showing a luminosity variation of 0.04 in magnitude.[8] Tau Cancri has an estimated 2.4 times the mass of the Sun and 7.8 times the Sun's radius. The star radiates 40 times the solar luminosity from its photosphere at an effective temperature of 5,153 K.[4]

## References

1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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.
2. ↑ 2.0 2.1 2.2 2.3 Argue, A. N. (1963), "UBV photometry of 300 G and K type stars", Monthly Notices of the Royal Astronomical Society 125 (6): 557–570, doi:10.1093/mnras/125.6.557, Bibcode: 1963MNRAS.125..557A
3. ↑ 3.0 3.1 3.2 Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
4. ↑ 4.0 4.1 4.2 4.3 Jofré, E. et al. (2015), "Stellar parameters and chemical abundances of 223 evolved stars with and without planets", Astronomy & Astrophysics 574: A50, doi:10.1051/0004-6361/201424474, Bibcode: 2015A&A...574A..50J.
5. ↑ Da Silva, Ronaldo et al. (2015), "Homogeneous abundance analysis of FGK dwarf, subgiant, and giant stars with and without giant planets", Astronomy & Astrophysics 580: A24, doi:10.1051/0004-6361/201525770, Bibcode: 2015A&A...580A..24D.
6. ↑ "tau Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=tau+Cnc.
7. ↑ Adelman, Saul J. (2001), "On the Photometric Variability of Red Clump Giants", Baltic Astronomy 10 (4): 593–597, doi:10.1515/astro-2001-0404, Bibcode: 2001BaltA..10..593A.
8. ↑ Adelman, S. J. et al. (December 2000), "On the Variability of G0-G9 Stars", Information Bulletin on Variable Stars 4993: 1, Bibcode: 2000IBVS.4993....1A.

* v
* t
* e

Cancer constellation

Stars (list)|

| Bayer|

* α (Acubens)
* β (Tarf)
* γ (Asellus Borealis)
* δ (Asellus Australis)
* ε (Meleph)
* ζ (Tegmine)
* η
* θ
* ι
* κ
* λ (Piautos)
* μ1
* μ2
* ν
* ξ (Nahn)
* ο1
* ο2
* π1
* π2
* ρ1 (Copernicus)
* ρ2
* σ1
* σ2
* σ3
* τ
* υ1
* υ2
* φ1
* φ2
* χ
* ψ1
* ψ2
* ω1

|

Flamsteed|

* 1
* 3
* 4 (ω2)
* 5
* 7
* 8
* 11
* 12
* 15
* 20 (d1)
* 21
* 24
* 25 (d2)
* 27
* 28
* 29
* 34
* 35
* 36 (c)
* 37
* 38
* 39
* 40
* 42
* 44
* 45 (A1)
* 46
* 49 (b)
* 50 (A2)
* 52
* 53
* 54
* 57
* 60
* 61
* 66
* 67
* 68
* 70
* 71
* 75
* 78
* 79
* 80
* 83
* 1 LMi
* 2 LMi
* 3 LMi
* 4 LMi

Variable|

* R
* S
* T
* U
* V
* X
* RS
* RU
* RX
* RZ
* SS
* SY
* TT
* TU
* TW
* TX
* UU
* VZ
* WY
* YZ
* AC
* AD
* AH
* AK
* AR
* AT
* AZ
* BN
* BQ
* BR
* BS
* BU
* BW
* BX
* CC
* CU
* CY
* DW
* DX
* EG
* EP
* ES
* EV
* EW
* EX
* FZ
* GY
* HU
* HV

HR|

* 3104
* 3115
* 3125
* 3127
* 3158
* 3164
* 3198
* 3201
* 3222
* 3228
* 3231
* 3252
* 3264
* 3306
* 3376
* 3380
* 3394
* 3395
* 3424
* 3428
* 3504
* 3558
* 3567
* 3599
* 3606
* 3617
* 3620
* 3635
* 3657
* 3689
* 3707

HD|

* 67542
* 69629
* 72115
* 73534
* 74721
* 76908
* 79498

Other|

* ADS 7284
* G 9-38
* HAT-P-31
* HIP 41378
* LHS 2090
* PSR B0823+26
* RX J0806.3+1527
* YBP 1194
* WDJ0914+1914

Star clusters|

| Open|

* Beehive Cluster
* Messier 67
* NGC 2664
* NGC 2678

|

Nebulae|

| Planetary|

* Abell 30

|

Galaxies|

| NGC|

* 2503
* 2507
* 2512
* 2513
* 2514
* 2522
* 2526
* 2530
* 2535
* 2536
* 2540
* 2545
* 2553
* 2554
* 2556
* 2557
* 2558
* 2560
* 2562
* 2563
* 2565
* 2569
* 2570
* 2572
* 2575
* 2576
* 2577
* 2581
* 2582
* 2592
* 2593
* 2594
* 2595
* 2596
* 2598
* 2599
* 2604
* 2604B
* 2607
* 2608
* 2611
* 2619
* 2620
* 2621
* 2622
* 2623
* 2624
* 2625
* 2628
* 2647
* 2648
* 2651
* 2657
* 2661
* 2667
* 2672
* 2673
* 2677
* 2679
* 2680
* 2711
* 2720
* 2725
* 2728
* 2730
* 2731
* 2734
* 2735
* 2735A
* 2737
* 2738
* 2741
* 2743
* 2744
* 2744A
* 2745
* 2747
* 2749
* 2750
* 2751
* 2752
* 2753
* 2761
* 2764
* 2766
* 2773
* 2774
* 2775
* 2777
* 2783
* 2783B
* 2786
* 2789
* 2790
* 2791
* 2794
* 2795
* 2796
* 2797
* 2801
* 2802
* 2803
* 2804
* 2807
* 2807A
* 2809
* 2812
* 2813
* 2819
* 2824
* 2843

|

Other|

* B2 0827+243
* 3C 190
* 3C 191
* 3C 192
* 3C 207
* 3C 212
* 3C 215
* 4C +29.30
* Mrk 704
* OI 090.4
* OJ 287
* QSO B0820+225
* QSO B0839+187

Galaxy
clusters|

* Abell 671
* Cancer Cluster
* Musket Ball Cluster

Other|

* GRB 021211
* SN 1999aa
* SN 2002lt

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