Lambda Persei

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λ Persei
Perseus constellation map.svg
Red circle.svg

Location of λ Persei (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Perseus
Right ascension 04h 06m 35.04360s[1]
Declination 50° 21′ 04.5500″[1]
Apparent magnitude (V) 4.29[2]
Spectral type A0IVn[3]
U−B color index -0.04[2]
B−V color index +0.02[2]
Radial velocity (Rv) +6.10[4] km/s
Proper motion (μ) RA: -12.75[1] mas/yr
Dec.: -35.60[1] mas/yr
Parallax (π) 7.73 ± 0.22[1] mas
Distance 420 ± 10 ly
(129 ± 4 pc)
Absolute magnitude (MV) -1.31[5]
Luminosity 348[5] L
Surface gravity (log g) 4.05[6] cgs
Temperature 10,585[6] K
Metallicity [Fe/H] +0.01[6] dex
Rotational velocity (v sin i) 196[3] km/s
Other designations
47 Persei, BD+49°1101, FK5 1113, GC 4924, HIP 19167, HR 1261, HD 25642, SAO 24412
Database references

Lambda Persei (λ Per, λ Persei) is a class A0IV[3] (white subgiant) star in the constellation Perseus. Its apparent magnitude is 4.29[2] and it is approximately 422 light years away based on parallax.[1]

In Chinese astronomy, Lambda Persei is called 積水, Pinyin: Jīshuǐ, meaning Stored Water, because this star is marking itself and stand alone in Stored Water asterism, Stomach mansion (see : Chinese constellation).[7]


  1. ^ a b c d e f Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.  Vizier catalog entry
  2. ^ a b c d 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. ^ a b c Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally published in: 1964BS....C......0H. 5050. Bibcode:1995yCat.5050....0H. 
  4. ^ Wilson, R. E. (1953). General Catalogue of Stellar Radial Velocities. Carnegie Institution for Science. Bibcode:1953GCRV..C......0W. LCCN 54001336. 
  5. ^ a b Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971Freely accessible. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015.  Vizier catalog entry
  6. ^ a b c Wu, Yue; Singh, H. P.; Prugniel, P.; Gupta, R.; Koleva, M. (2010). "Coudé-feed stellar spectral library – atmospheric parameters". Astronomy & Astrophysics. 525: A71. arXiv:1009.1491Freely accessible. Bibcode:2011A&A...525A..71W. doi:10.1051/0004-6361/201015014. 
  7. ^ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 11 日