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Epsilon Andromedae

ε Andromedae
Location of ε Andromedae (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Andromeda
Right ascension 00h 38m 33.34610s[1]
Declination +29° 18′ 42.3135″[1]
Apparent magnitude (V) 4.357[2]
Characteristics
Spectral type G6 III Fe−3 CH1[3]
U−B color index +0.463[2]
B−V color index +0.8713[2]
V−R color index +0.6[4]
R−I color index +0.51[5]
Astrometry
Radial velocity (Rv)−84.43±0.15[6] km/s
Proper motion (μ) RA: −229.04[1] mas/yr
Dec.: −253.11[1] mas/yr
Parallax (π)19.91 ± 0.19 mas[1]
Distance164 ± 2 ly
(50.2 ± 0.5 pc)
Absolute magnitude (MV)+0.69[7]
Details[6]
Mass1.01±0.35 M☉
Radius9.04±0.34 R☉
Luminosity51.3 L☉
Surface gravity (log g)2.88±0.02 cgs
Temperature5,082±20 K
Metallicity [Fe/H]−0.53±0.05 dex
Rotational velocity (v sin i)1.70±0.45 km/s
Age5.71±5.29 Gyr
Other designations
ε And, 30 Andromedae, BD+28° 103, FK5 19, GC 759, HD 3546, HIP 3031, HR 163, SAO 74164, PPM 90002, LTT 10215, NLTT 2065[4]
Database references
SIMBADdata

Epsilon Andromedae, Latinized from ε Andromedae, is a star in the constellation of Andromeda.[4] It can be seen with the naked eye, having an apparent visual magnitude of 4.4.[2] Based upon an annual parallax shift of 21.04 mas as seen from Earth,[1] it is located 155 light years from the Sun. The system is moving closer to the Sun with a radial velocity of −84 km/s.[6] Its orbit in the Milky Way is highly eccentric, causing it to move rapidly relative to the Sun and its neighboring stars.[8]

  1. ^ a b c d e f van Leeuwen, F. (November 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. S2CID 18759600.
  2. ^ a b c d Jennens, P. A.; Helfer, H. L. (September 1975). "A new photometric metal abundance and luminosity calibration for field G and K giants". Monthly Notices of the Royal Astronomical Society. 172 (3): 667–679. Bibcode:1975MNRAS.172..667J. doi:10.1093/mnras/172.3.667.
  3. ^ Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series. 71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373.
  4. ^ a b c "eps And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved August 28, 2008.
  5. ^ HR 163, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line August 28, 2008.
  6. ^ a b c Jofré, E.; Petrucci, R.; Saffe, C.; Saker, L.; de la Villarmois, E. Artur; Chavero, C.; Gómez, M.; Mauas, P. J. D. (2015). "Stellar parameters and chemical abundances of 223 evolved stars with and without planets". Astronomy & Astrophysics. 574: A50. arXiv:1410.6422. Bibcode:2015A&A...574A..50J. doi:10.1051/0004-6361/201424474. S2CID 53666931.
  7. ^ Takeda, Yoichi; et al. (August 2008). "Stellar Parameters and Elemental Abundances of Late-G Giants". Publications of the Astronomical Society of Japan. 60 (4): 781–802. arXiv:0805.2434. Bibcode:2008PASJ...60..781T. doi:10.1093/pasj/60.4.781. S2CID 16258166.
  8. ^ Cite error: The named reference kaler was invoked but never defined (see the help page).

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