51 Andromedae

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51 Andromedae
Location of 51 Andromedae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 01h 37m 59.56074s[1]
Declination +48° 37′ 41.5798″[1]
Apparent magnitude (V) 3.57[2]
Characteristics
Spectral type K3- III CN0.5[3]
U−B color index +1.44[2]
B−V color index +1.28[2]
Distance
169 ± 4 ly
(52 ± 1 pc)
Absolute magnitude (MV)−0.04[5]
Details
Gyr
PPM 44238[7]
Database references
SIMBADdata

51 Andromedae, abbreviated 51 And and formally named Nembus /ˈnɛmbəs/,[8] is the 5th brightest star in the northern constellation of Andromeda, very slightly dimmer than the Andromeda Galaxy also being of 4th magnitude. It is an orange K-type giant star with an apparent magnitude of +3.57 and is about 169 light-years from the Earth/solar system. It is traditionally depicted as one of the two northern, far upper ends of the mythological, chained-to-the-rocks princess, the other being binary star system Gamma Andromedae.

At an estimated age of 1.7 billion years, this is an

Sun's luminosity from its enlarged photosphere at an effective temperature of 4,951 K.[6]

Nomenclature

51 Andromedae is the star's Flamsteed designation. Ptolemy included this star in Andromeda in the Almagest. It was for a time moved into the greater form of Perseus envisioned by Johann Bayer as Upsilon Persei. Flamsteed oversaw its constellation reverting and the International Astronomical Union (IAU) made his 51 Andromedae its official designation in 1930.[9][10][11]

The star bore the name Nembus, of undetermined origin and meaning,[12] in Bayer's Uranometria (1603)[13] and Bode's star atlas Uranographia (1801).[14] In 2016, the IAU organized a Working Group on Star Names (WGSN)[15] to catalog and standardize proper names for stars. The WGSN approved the name Nembus for this star on 5 September 2017 and it is now so included in the List of IAU-approved Star Names.[8]

In

Chinese name for 51 Andromedae itself is 天大將軍三 (Tiān Dà Jiāng Jūn sān, English: the Third Star of Heaven's Great General.)[citation needed
]

References

  1. ^
    doi:10.1051/0004-6361/201833051
    .
  2. ^
    Bibcode:2002yCat.2237....0D
    .
  3. ^
    doi:10.1086/191373
    .
  4. S2CID 119289111
    .
  5. S2CID 12136256
    .
  6. ^
    S2CID 119427037
    .
  7. ^ "HD 9927". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 24 August 2018.
  8. ^ a b "Naming Stars". IAU.org. Retrieved 16 December 2017.
  9. ^ "Ephemerides – Report of Commissions", Transactions of the International Astronomical Union, 4: 20, 1932
  10. Allen, R. H.
    (1899). Star-names and Their Meanings. New York: G. E. Stechart., p.34.
  11. ISBN 0-939923-78-5
    .
  12. Allen, R. H.
    (1899). Star-names and Their Meanings. New York: G. E. Stechart. p.334
  13. ^ Scans of the plates of Uranometria by J. Bayer, 1603 Archived August 7, 2008, at the Wayback Machine @Linda Hall Library
  14. ^ Scan of the plates of Uranographia by J.E. Bode, 1801 @Ian Ridpath's Star Tales
  15. ^ "IAU Working Group on Star Names (WGSN)". Retrieved 22 May 2016.
  16. ISBN 978-986-7332-25-7
    .

External links
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