1 Serpentis

1 Serpentis (1 Ser) is a red giant in the constellation Virgo with an apparent magnitude of 5.52. It is a red clump giant, a cool horizontal branch star that is fusing helium in its core.[6] It has expanded to over 13 times the radius of the Sun and although it is cooler at 4,581 K it is 77 times more luminous. It is 322 light years away.

1 Serpentis
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Virgo
Right ascension  14h 57m 33.251s [1]
Declination −00° 10′ 03.39″ [1]
Characteristics
Evolutionary stage Red clump
Spectral type K1III[2]
Astrometry
Radial velocity (Rv)20.12[3] km/s
Proper motion (μ) RA: +59.489[1] mas/yr
Dec.: −26.408[1] mas/yr
Parallax (π)10.1279 ± 0.1747[1] mas
Distance322 ± 6 ly
(99 ± 2 pc)
Absolute magnitude (MV)+0.76[4]
Details
Mass1.37[5] M☉
Radius13.6[1] R☉
Luminosity77[1] L☉
Surface gravity (log g)2.5[3] cgs
Temperature4,581[3] K
Metallicity [Fe/H]−0.07[3] dex
Rotational velocity (v sin i)3.4[3] km/s
Age4.58[6] Gyr
Other designations
1 Ser, BD+00°3277, GJ 3881, HD 132132, HIP 73193, HR 5573, SAO 120758
Database references
SIMBADdata

The Flamsteed designation 1 Serpentis was given to the star when the constellation Serpens was combined with the constellation Ophiuchus.[7] It was also given the Bayer designation M Serpentis. When Ophiuchus and Serpens were separated into distinct constellations, 1 Serpentis was left over the border in Libra. Since then it has moved slightly and is now in Virgo.[8]

A 10th-magnitude companion star discovered by William Herschel is 86″ away.[9] It is at the same distance as 1 Ser and shares a common proper motion,[10] It is considered likely to be a physical companion,[11] with the two stars separated by 8,600 au.[12] It has a spectral type of G5 IV,[12] and it is slightly smaller and less luminous than the sun.[10]

A much more widely-separated 10th-magnitude star is also listed in multiple star catalogues,[9] but it is an unrelated background object.[13]

References
  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. Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5". Michigan Spectral Survey. 5. Bibcode:1999MSS...C05....0H.
  3. Massarotti, Alessandro; Latham, David W.; Stefanik, Robert P.; Fogel, Jeffrey (2008). "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity". The Astronomical Journal. 135 (1): 209. Bibcode:2008AJ....135..209M. doi:10.1088/0004-6256/135/1/209.
  4. 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.
  5. Luck, R. Earle; Heiter, Ulrike (2007). "Giants in the Local Region". The Astronomical Journal. 133 (6): 2464. Bibcode:2007AJ....133.2464L. doi:10.1086/513194.
  6. 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. arXiv:0712.1370. Bibcode:2008A&A...480...91S. doi:10.1051/0004-6361:20078788.
  7. Ian Rdipath. "Serpens, the serpent". Retrieved 2019-08-28.
  8. Hoffleit, Dorrit; Jaschek, Carlos (1991). The Bright star catalogue. Bibcode:1991bsc..book.....H.
  9. Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi:10.1086/323920.
  10. 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.
  11. 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. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x.
  12. Stephenson, C. B. (1960). "A study of visual binaries having primaries above the main sequence". The Astronomical Journal. 65: 60. Bibcode:1960AJ.....65...60S. doi:10.1086/108191.
  13. 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.
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