Rho2 Cephei

Short description: Star in the constellation Cepheus

For other stars with this Bayer designation, see ρ Cephei.

Rho2 Cephei  Observation data
Equinox J2000.0]] (ICRS)

Constellation | Cepheus
Right ascension |  22h 29m 52.97918s[1]
Declination | +78° 49′ 27.4282″[1]
Apparent magnitude (V) | 5.50[2]
Characteristics
Spectral type | A3 V[3]
U−B color index | +0.07[2]
B−V color index | +0.06[2]
Astrometry
Proper motion (μ)|  RA: +3.68[1] mas/yr
Dec.: −21.29[1] mas/yr
Parallax (π)| 13.31 ± 0.21[1] mas
Distance| 245 ± 4 ly
(75 ± 1 pc)
Absolute magnitude (MV)| +1.07[4]
Details
Mass| 2.23±0.03[5] M☉
Luminosity| 32[4] L☉
Surface gravity (log g)| 4.2[6] cgs
Temperature| 8,511[5] K
Rotational velocity (v sin i)| 133[7] km/s
Age| 85[6] Myr
Other designations

Cephei, ρ2 Cep, 29 Cephei, BD+78° 801, FK5 1593, HD 213798, HIP 111056, HR 8591, SAO 10402[8]

Database references
SIMBAD| data

Rho2 Cephei, Latinized from ρ2 Cephei, or simply ρ Cephei, is a solitary[9] star in the northern constellation of Cepheus. With an apparent visual magnitude of 5.50,[2] it is faintly visible to the naked eye, forming an optical pair with Rho1 Cephei. Based upon an annual parallax shift of 13.31 mas as seen from the Earth,[1] it is located about 245 light years from the Sun.

Rho2 Cephei is an A-type main sequence star with a stellar classification of A3 V,[3] estimated to be 85 million years old. It has a high rate of rotation, showing a projected rotational velocity of 133 km/s.[7] The effective temperature of its photosphere is 8,511 K and its bolometric luminosity, the total amount of radiation it emits at all wavelengths, is 32 L☉.

## 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 Oja, T. (April 1983), "UBV photometry of FK4 and FK4 supplement stars", Astronomy and Astrophysics Supplement Series 52: 131–134, Bibcode: 1983A&AS...52..131O.
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 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
5. ↑ 5.0 5.1 Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics 537: A120, doi:10.1051/0004-6361/201117691, Bibcode: 2012A&A...537A.120Z.
6. ↑ 6.0 6.1 Gullikson, Kevin; Kraus, Adam; Dodson-Robinson, Sarah (2016). "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars". The Astronomical Journal 152 (2): 40. doi:10.3847/0004-6256/152/2/40. Bibcode: 2016AJ....152...40G.
7. ↑ 7.0 7.1 Royer, F. et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics 463 (2): 671–682, doi:10.1051/0004-6361:20065224, Bibcode: 2007A&A...463..671R.
8. ↑ "rho Cep -- Star", SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), http://simbad.u-strasbg.fr/simbad/sim-id?Ident=rho02+Cep, retrieved 2017-05-05.
9. ↑ 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

Cepheus constellation

Stars (list)|

| Bayer|

* α (Alderamin)
* β (Alfirk)
* γ (Errai)
* δ
* ε
* ζ
* η
* θ
* ι
* κ
* λ
* μ (Garnet Star)
* ν
* ξ (Kurhah)
* ο
* π
* ρ1
* ρ2

|

Flamsteed|

* 4
* 6
* 7
* 9
* 11
* 12
* 13
* 14
* 15
* 16
* 18
* 19
* 20
* 24
* 25
* 26
* 30
* 31
* 77 Dra
* 78 Dra
* 79 Dra
* 80 Dra
* 2 UMi

Variable|

* S
* T
* U
* V
* W
* RW
* RZ
* SV
* VV
* VW
* WX
* WZ
* XX
* XZ
* ZZ
* AH
* AK
* BH
* BO
* CP
* CQ
* CR
* CW
* CX
* DH
* DI
* DO
* DQ
* EE
* EG
* EI
* EK
* EM
* GP
* GW
* IL
* IR
* IV
* NY
* OV
* PQ
* PV
* V350
* V354
* V368
* V374
* V379
* V380
* V381
* V388
* V398
* V408
* V414
* V419
* V421
* V422
* V426
* V431
* V438
* V444
* V458

HR|

* 20
* 55
* 158
* 240
* 306
* 312
* 333
* 357
* 386
* 572
* 597
* 774
* 881
* 906
* 961
* 965
* 1107
* 1304
* 1317
* 1523
* 1616
* 1885
* 7742
* 7925
* 7938
* 7955
* 7967
* 7993
* 8029
* 8043
* 8049
* 8065
* 8099
* 8119
* 8133
* 8150
* 8168
* 8174
* 8179
* 8226
* 8239
* 8243
* 8281
* 8312
* 8327
* 8342
* 8347
* 8357
* 8374
* 8375
* 8384
* 8388
* 8395
* 8442
* 8472
* 8474
* 8476
* 8479
* 8483
* 8490
* 8493
* 8506
* 8535
* 8537
* 8546
* 8557
* 8568
* 8595
* 8598
* 8599
* 8625
* 8677
* 8683
* 8687
* 8696
* 8702
* 8707
* 8736
* 8745
* 8748
* 8779
* 8808
* 8811
* 8844
* 8867
* 8918
* 8938
* 8952
* 8971
* 8972
* 9005
* 9013
* 9038
* 9104

HD|

* 12918
* 12927
* 25904
* 200775
* 204521
* 204827
* 207538
* 207826
* 208132
* 208392
* 212136
* 215588
* 217903
* 224890

Gliese|

* Gliese 48
* Gliese 809
* GJ 1277

Other|

* Cepheus A HW 2
* Cepheus X-4
* IRAS 21391+5802
* Kruger 60
* NGC 7538 IRS 1
* NGC 7538 IRS 9
* OH 104.9+2.4
* PSR B2224+65
* PSR J2229+6114
* S140 IRS 1
* TYC 3980-1081-1
* 4U 2206+54
* WISE 0313+7807
* WR 152
* WR 156

Star clusters|

| Association|

* Cepheus OB2
* Cepheus OB3
* Cepheus OB4

|

Open|

* NGC 188
* NGC 6939
* NGC 7023
* NGC 7129
* NGC 7142
* NGC 7160
* NGC 7226
* NGC 7234
* NGC 7261
* NGC 7281
* NGC 7380
* NGC 7419
* NGC 7423
* NGC 7429
* NGC 7510
* NGC 7762
* S 140
* Trumpler 37

Globular|

* Palomar 1

Molecular clouds|

* Cepheus A
* Cepheus B
* Cepheus C

Nebulae|

| Dark|

* Barnard 150
* CB 244
* Elephant's Trunk Nebula
* IC 1396N
* L1157
* L1228

|

H II|

* IC 1396
* NGC 7538
* NGC 7822
* S 128
* S 140
* S 155
* S 156

Reflection|

* Ghost Nebula
* Iris Nebula
* NGC 7129
* VdB 157

Planetary|

* NGC 40
* NGC 7076
* NGC 7139
* NGC 7354

SNR|

* CTA 1
* SSTGFLS J222557+601148

Galaxies|

| NGC|

* 1184
* 1544
* 2276
* 2300
* 6949
* 6952

|

Other|

* 3C 61.1
* 3C 427.1
* 4C +74.26
* QSO B2021+614
* S5 0014+81

Other|

* GRB 980519
* SN 2008S

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