8 Cancri

Short description: Star in the constellation Cancer

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

Constellation | Cancer
Right ascension |  08h 05m 04.48834s[1]
Declination | +13° 07′ 05.5757″[1]
Apparent magnitude (V) | +5.14[2]
Characteristics
Spectral type | A1 V[3]
B−V color index | 0.018±0.005[2]
Astrometry
Radial velocity (Rv)| +21.0±4.2[4] km/s
Proper motion (μ)|  RA: −35.78[1] mas/yr
Dec.: −63.81[1] mas/yr
Parallax (π)| 15.20 ± 0.32[1] mas
Distance| 215 ± 5 ly
(66 ± 1 pc)
Absolute magnitude (MV)| 1.05[2]
Details
Mass| 2.37[5] M☉
Luminosity| 36.6[2] L☉
Surface gravity (log g)| 4.29±0.14[5] cgs
Temperature| 10,352±352[5] K
Rotational velocity (v sin i)| 173[5] km/s
Age| 144[5] Myr
Other designations

8 Cnc, BD+13°1831, FK5 2625, GC 10959, HD 66664, HIP 39567, HR 3163, SAO 97542[6]

Database references
SIMBAD| data

8 Cancri is a single,[7] white-hued star in the zodiac constellation of Cancer. It has an apparent visual magnitude of +5.14,[2] which indicates it is faintly visible to the naked eye under suitable viewing conditions. The distance to this star, as determined from its annual parallax shift of 15.20 mas,[1] is around 215 light years. A radial velocity of +21 km/s indicates it is moving away from the Sun.[4]

This is an A-type main-sequence star with a stellar classification of A1 V.[3] It is a young star with an estimated age of just 144[5] million years, and has a high rate of spin with a projected rotational velocity of 173 km/s.[5] 8 Cancri has 2.37[5] times the mass of the Sun and is radiating 36.6[2] times the Sun's luminosity from its photosphere at an effective temperature of around 10,352 K.[5]

## 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 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 Cowley, A. et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal 74: 375–406, doi:10.1086/110819, Bibcode: 1969AJ.....74..375C.
4. ↑ 4.0 4.1 de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics 546: 14, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
5. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 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.
6. ↑ "8 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=8+Cnc.
7. ↑ 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.

* 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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