Mu Persei

Mu Persei (Mu Per, μ Persei, μ Per) is a binary star in the constellation of Perseus, with an apparent magnitude of +4.16. The primary component is a yellow G-type supergiant. It is approximately 900 light years from Earth. With an effective temperature of about 5400 kelvins and a radius of 53 solar radii, this star has the luminosity of about 2030 times that of the Sun.[6] Mu Persei is a spectroscopic binary with an orbital period of 284 days and an eccentricity of about 0.06.[5]

Mu Persei
Location of μ Persei (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Perseus
Right ascension  04h 14m 53.86253s[1]
Declination +48° 24′ 33.5912″[1]
Apparent magnitude (V) +4.16[2]
Characteristics
Spectral type G0Ib[3]
Astrometry
Radial velocity (Rv)26.46[4] km/s
Proper motion (μ) RA: 5.52[1] mas/yr
Dec.: -17.37[1] mas/yr
Parallax (π)3.62 ± 0.20[1] mas
Distance900 ± 50 ly
(280 ± 20 pc)
Orbit[5]
Period (P)284 d
Semi-major axis (a)18.8 ± 8.8 mas
Eccentricity (e)0.062
Inclination (i)74 ± 24°
Longitude of the node (Ω)296 ± 18°
Periastron epoch (T)2420062
Argument of periastron (ω)
(secondary)		302°
Details
Radius~53[6] R☉
Luminosity~2030[6] L☉
Surface gravity (log g)1.74[7] cgs
Temperature5418[7] K
Metallicity [Fe/H]0.09[7] dex
Rotational velocity (v sin i)12[8] km/s
Other designations
μ Persei, 51 Persei, BD+48 1063, CCDM J04149+4824A, FK5 1117, GC 5099, HD 26630, HIP 19812, HR 1303, PPM 46912, SAO 39404, WDS J04149+4825A
Database references
SIMBADdata

Mu Persei is moving through the Galaxy at a speed of 35.6 km/s relative to the Sun. Its projected Galactic orbit carries it between 23,900 and 32,400 light years from the center of the Galaxy.[9]

Mu Persei came closest to the Sun 5.6 million years ago when it had brightened to magnitude 3.25 from a distance of 600 light years.[9]

Naming

In Chinese, 天船 (Tiān Chuán), meaning Celestial Boat, refers to an asterism consisting of μ Persei, η Persei, γ Persei, α Persei, ψ Persei, δ Persei, 48 Persei and HD 27084. Consequently, μ Persei itself is known as 天船七 (Tiān Chuán qī, English: the Seventh Star of Celestial Boat.)[10]

References
  1. van Leeuwen, F.; et al. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  2. Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  3. "* mu. Per". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 23 February 2017.
  4. Soubiran, C.; Bienaymé, O.; Mishenina, T. V.; Kovtyukh, V. V. (2008). "Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants". Astronomy and Astrophysics. 480 (1): 91–101. arXiv:0712.1370. Bibcode:2008A&A...480...91S. doi:10.1051/0004-6361:20078788.
  5. Alden, Harold L. (1925). "Apparent orbit of μ Persei". Astronomical Journal. 36 (851): 81–82. Bibcode:1925AJ.....36...81A. doi:10.1086/104676.
  6. MU PER (Mu Persei)
  7. Luck, R. Earle (2014). "Parameters and Abundances in Luminous Stars". The Astronomical Journal. 147 (6). Bibcode:2014AJ....147..137L. doi:10.1088/0004-6256/147/6/137.
  8. de Medeiros, J. R.; Udry, S.; Burki, G.; Mayor, M. (2002). "A catalog of rotational and radial velocities for evolved stars. II. Ib supergiant stars" (PDF). Astronomy and Astrophysics. 395: 97–98. Bibcode:2002A&A...395...97D. doi:10.1051/0004-6361:20021214.
  9. Mu Persei (HIP 19812) Archived 2013-04-14 at Archive.today
  10. (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 11 日
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