Zeta Serpentis

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Zeta Serpentis
Observation data
Epoch J2000      Equinox J2000
Constellation Serpens
Right ascension 18h 00m 29.0s[1] [2]
Declination −03° 41′ 25″[1][2]
Apparent magnitude (V) 4.615[3]
Spectral type F2 V[4]
U−B color index −0.002[3]
B−V color index +0.386[3]
Radial velocity (Rv) −50.70±0.2[5] km/s
Proper motion (μ) RA: +155.51[2] mas/yr
Dec.: −44.43[2] mas/yr
Parallax (π) 42.46 ± 0.34[2] mas
Distance 76.8 ± 0.6 ly
(23.6 ± 0.2 pc)
Absolute magnitude (MV) 2.70[6]
Mass 1.429±0.013 M
Radius 1.961±0.071 R
Luminosity 6.251±0.127 L
Surface gravity (log g) 4.14[7] cgs
Temperature 6,529±118 K
Metallicity [Fe/H] −0.12[7] dex
Rotational velocity (v sin i) 69.3±3.5[6] km/s
Age 2.4±0.2 Gyr
Other designations
ζ Ser, 57 Serpentis, BD−03° 4217, GC 24503, HD 164259, HIP 88175, HR 6710, SAO 142025[8]
Database references

Zeta Serpentis, Latinized from ζ Serpentis, is the Bayer designation for a single,[9] yellow-white hued star in the equatorial constellation of Serpens. It is visible to the naked eye, having an apparent visual magnitude of 4.6.[3] Based upon an annual parallax shift of 42.46 milliarcseconds as measured from the Hipparcos spacecraft, it is located 77 light years from the Sun. The star is moving closer to the Sun with a radial velocity of −50.7 km/s.[5] It will make its closest approach in about 400,000 years when it makes perihelion passage at an estimated distance of 25.7 ly (7.88 pc).[10]

Around 2.4 billion years old,[1] Zeta Serpentis has a stellar classification of F2 V[4] indicating it is an ordinary F-type main-sequence star. This star has nearly double the radius of the Sun, 1.4 times the Sun's mass, and is radiating 6.3 times the Sun's luminosity from its outer atmosphere at an effective temperature of 6,529 K.[1] It has a relatively high rate of spin, showing a projected rotational velocity of 69 km/s.[6]


  1. ^ a b c d e Boyajian, Tabetha S.; et al. (February 2012), "Stellar Diameters and Temperatures. I. Main-sequence A, F, and G Stars", The Astrophysical Journal, 746 (1): 101, arXiv:1112.3316Freely accessible, Bibcode:2012ApJ...746..101B, doi:10.1088/0004-637X/746/1/101 . See Table 10.
  2. ^ a b c d e van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.  Vizier catalog entry
  3. ^ a b c d Kozok, J. R. (September 1985). "Photometric observations of emission B-stars in the southern Milky Way". Astronomy and Astrophysics Supplement Series. 61: 387–405. Bibcode:1985A&AS...61..387K. 
  4. ^ a b Gray, R. O.; et al. (October 2003), "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 Parsecs: The Northern Sample. I.", The Astronomical Journal, 126 (4): 2048–2059, arXiv:astro-ph/0308182Freely accessible, Bibcode:2003AJ....126.2048G, doi:10.1086/378365 
  5. ^ a b Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053Freely accessible. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. 
  6. ^ a b c Reiners, A. (January 2006), "Rotation- and temperature-dependence of stellar latitudinal differential rotation", Astronomy and Astrophysics, 446 (1): 267–277, arXiv:astro-ph/0509399Freely accessible, Bibcode:2006A&A...446..267R, doi:10.1051/0004-6361:20053911. 
  7. ^ a b Balachandran, Suchitra (May 1, 1990), "Lithium depletion and rotation in main-sequence stars", Astrophysical Journal, Part 1, 354: 310–332, Bibcode:1990ApJ...354..310B, doi:10.1086/168691 
  8. ^ "* zet Peg". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2015-10-17. 
  9. ^ Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878Freely accessible. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. 
  10. ^ Bailer-Jones, C. A. L. (March 2015). "Close encounters of the stellar kind". Astronomy & Astrophysics. 575: 13. arXiv:1412.3648Freely accessible. Bibcode:2015A&A...575A..35B. doi:10.1051/0004-6361/201425221. A35.