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2 Persei

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Dec 14, 2021

2 Persei is a binary star system in the northern constellationPerseus, located around 500 light years away from the Sun. It is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude is 5.70.[2] The system is moving further away from the Earth with a heliocentric radial velocity of 11 km/s.[4]

Star in the constellation Perseus

2 Persei
Observation data
Epoch J2000      Equinox J2000
Constellation Perseus
Right ascension 01h 52m 09.37243s[1]
Declination +50° 47 34.0662[1]
Apparent magnitude (V) 5.70[2]
Characteristics
Spectral type B9pHgMn[3]
B−V color index −0.067±0.004[2]
Astrometry
Radial velocity(Rv) 11.4±0.2[4] km/s
Proper motion(μ) RA: +17.454[1] mas/yr
Dec.: −29.871[1] mas/yr
Parallax(π) 6.5107 ± 0.1939[1] mas
Distance 500 ± 10 ly
(154 ± 5 pc)
Absolute magnitude (MV) −0.14[2]
Orbit[4]
Primary 2 Persei A
Companion 2 Persei B
Period(P) 5.62698±0.00002 d
Eccentricity(e) 0.024±0.011
Periastronepoch(T) 2440281.3±0.4 JD
Argument of periastron(ω)
(primary)
208±24°
Semi-amplitude(K1)
(primary)
26.5±0.3 km/s
Details
Luminosity 145.30[2] L
Temperature 9,412[1] K
Rotational velocity(v sin i) 25[5] km/s
Other designations
BD+50°379, FK5 1052, HD 11291, HIP 8714, HR 536, SAO 22696[6]
Database references
SIMBAD data

In 1970 radial velocity measurements from spectrograms taken at David Dunlap Observatory indicated it was a single-lined spectroscopic binary.[7][5] Follow up observations led to the determination that it had a nearly circular orbit with a period of 5.6 days.[4] The visible component is a chemically peculiarmercury-manganese star with a stellar classification of B9pHgMn.[3] Other analyses of its spectrum have assigned it the giant star spectral type of B9III.[8]

. . . 2 Persei . . .

  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). Gaia Data Release 2: Summary of the contents and survey properties”. Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A…616A…1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. Anderson, E.; Francis, Ch. (2012). “XHIP: An extended hipparcos compilation”. Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL…38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
  3. Cowley, A.; et al. (April 1969). “A study of the bright A stars. I. A catalogue of spectral classifications”. Astronomical Journal. 74: 375–406. Bibcode:1969AJ…..74..375C. doi:10.1086/110819.
  4. Heard, J. F.; Krautter, A. (1975). “The orbit of the spectroscopic binary HD 11291”. Journal of the Royal Astronomical Society of Canada. 69: 22–24. Bibcode:1975JRASC..69…22H.
  5. Abt, Helmut A.; et al. (July 2002). “Rotational Velocities of B Stars”. The Astrophysical Journal. 573 (1): 359–365. Bibcode:2002ApJ…573..359A. doi:10.1086/340590.
  6. “2 Per”. SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-03-19.
  7. Hube, Douglas P. (1970). “The radial velocities of 335 late B-type stars”. Memoirs of the Royal Astronomical Society. 72: 233–280. Bibcode:1970MmRAS..72..233H.
  8. Sato, K.; Kuji, S. (November 1990). “MK classification and photometry of stars used for time and latitude observations at Mizusawa and Washington”. Astronomy and Astrophysics Supplement Series. 85 (3): 1069–1087. Bibcode:1990A&AS…85.1069S.
Stars
Bayer
Flamsteed
Variable
  • S
  • T
  • U
  • V
  • X
  • Z
  • RS
  • RT
  • RV
  • RW
  • RY
  • ST
  • SU
  • SV
  • TZ
  • UV
  • UX
  • UY
  • VX
  • XX
  • XY
  • XZ
  • YZ
  • AB
  • AG
  • AR
  • AS
  • AW
  • AX
  • BM
  • DM
  • DY
  • FO
  • GK
  • IK
  • IP
  • IQ
  • IU
  • IW
  • IX
  • IZ
  • KP
  • KS
  • KT
  • KW
  • LX
  • V351
  • V356
  • V357
  • V361
  • V376
  • V380
  • V386
  • V396
  • V392
  • V400
  • V423
  • V432
  • V440
  • V459
  • V461
  • V471
  • V472
  • V473
  • V480
  • V490
  • V492
  • V493
  • V505
  • V509
  • V520 (61 And)
  • V521
  • V545
  • V551
  • V572
  • V573
  • V575
  • V576
  • V621
  • V718
HR
  • 470
  • 526
  • 529
  • 538
  • 540
  • 621
  • 641
  • 787
  • 792
  • 810
  • 820
  • 831
  • 842
  • 846
  • 849
  • 864
  • 865
  • 876
  • 885
  • 886
  • 890
  • 894
  • 918 (k)
  • 920
  • 923
  • 930
  • 949
  • 950
  • 956
  • 964
  • 966
  • 969
  • 973
  • 975
  • 979
  • 986
  • 991
  • 1001
  • 1019
  • 1034
  • 1037
  • 1041
  • 1047
  • 1051
  • 1056
  • 1059
  • 1074
  • 1097
  • 1113
  • 1127
  • 1130
  • 1133
  • 1141
  • 1160
  • 1164
  • 1176
  • 1191
  • 1197
  • 1198
  • 1207
  • 1215
  • 1226
  • 1234
  • 1286
  • 1301
  • 1330
  • 1333
  • 1337
  • 1344
  • 1371
  • 1390
  • 1419
  • 1424
  • 1482
  • 1489
  • 1493
  • 1500
  • 1514
HD
Other
Exoplanets
Star
clusters
NGC
Other
Nebulae
NGC
Other
Galaxies
NGC
Other
Galaxy clusters
Astronomical events

. . . 2 Persei . . .

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. . . 2 Persei . . .