Eta Boötis

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η Boötis
Location of η Boötis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
Right ascension 13h 54m 41.07892s[1]
Declination +18° 23′ 51.7946″[1]
Apparent magnitude (V) 2.680[2]
Characteristics
Spectral type G0 IV[3]
U−B color index +0.207[4]
B−V color index +0.585[4]
Distance
37.2 ± 0.5 ly
(11.4 ± 0.2 pc)
Absolute magnitude (MV)2.41[2]
Details
Gyr
HIP 67927, WDS
 J13547+1824
Database references
SIMBADdata

Eta Boötis (η Boötis, abbreviated Eta Boo, η Boo) is a

spectrum of this star has served as one of the stable anchor points by which other stars are classified.[8] It forms a double star with the star BD+19 2726.[9]

As a constituent of a double pair, Eta Boötis is also designated WDS J13547+1824A, with its two components being designated Aa (formally named Muphrid /ˈmjuːfrɪd/, the traditional name for the entire system)[10] and Ab. (As part of a binary pair, they are also designated Eta Boötis A and B, respectively.) BD +19 2726 is also designated WDS J13547+1824B.[9]

Nomenclature

η Boötis (Latinised to Eta Boötis) is the binary pair's Bayer designation; η Boötis A and B those of its two components. The designations of the two constituents of the double pair as WDS J13547+1824A and B and those of A's components - Aa and Ab - derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU).[11]

Eta Boötis bore the traditional names Muphrid and Saak.

multiple systems.[15] It approved the name Muphrid for the component WDS J13547+1824Aa (Eta Boötis A) on 12 September 2016 and it is now so included in the List of IAU-approved Star Names.[10]

In the catalogue of stars in the Calendarium of Al Achsasi al Mouakket, this star was designated Ramih al Ramih (رمح الرامح rumḥ al rāmiḥ), which was translated into Latin as Lancea Lanceator, possibly meaning the lance of the lancer.[16]

In

Chinese name for Eta Boötis itself is 右攝提一 (Yòu Niè Dī yī, English: "the First Star of the Right Conductor").[18]

Properties

Eta Boötis is a suspected

speckle interferometry. This measurement does not rule out a low mass stellar companion of spectral class M7.[5]

Eta Boötis presents as a

galactic disk.[19]

Eta Boötis appears close to the prominent star Arcturus (Alpha Bootis) in Earth's sky, and Arcturus is in fact its closest stellar neighbor, as both stars are nearly identical in distance from the Sun. The two stars are about 3.24 light-years apart,[20] and each would appear bright in the other's sky. Arcturus would appear as roughly magnitude -5.2 (about 120 times brighter than it appears from Earth, or close to twice the brightness of Venus) in the night sky of a hypothetical planet orbiting Eta Boötis, while Eta Boötis would appear at about magnitude −2.4 (absolute magnitude −2.41 at 0.99 parsec) in the sky of a hypothetical planet orbiting Arcturus, or over twice the brightness of Sirius in the night sky.

See also

References

  1. ^
    S2CID 18759600. Note: see VizieR catalogue I/311
    .
  2. ^
    S2CID 118577511
    .
  3. ^
    S2CID 118169489
    .
  4. ^
    Bibcode:1986A&AS...65..405O
    .
  5. ^
    S2CID 91176575
    .
  6. S2CID 243472312
    .
  7. doi:10.1051/0004-6361:200810377
    .
  8. Bibcode:1993AAS...183.1710G. Archived from the original
    on 2019-06-25. Retrieved 2012-02-04.
  9. ^ a b "Washington Double Star Catalog". United States Naval Observatory. Retrieved 1 October 2023.
  10. ^ a b "Naming Stars". IAU.org. Retrieved 16 December 2017.
  11. arXiv:1012.0707 [astro-ph.SR
    ].
  12. S2CID 120743052
    .
  13. ISBN 978-3-447-03491-3
    .
  14. ^ "IAU Working Group on Star Names (WGSN)". International Astronomical Union. Retrieved 22 May 2016.
  15. ^ "WG Triennial Report (2015-2018) - Star Names" (PDF). p. 5. Retrieved 2018-07-14.
  16. doi:10.1093/mnras/55.8.429
    .
  17. ISBN 978-986-7332-25-7
    .
  18. ^ (in Chinese) 香港太空館 - 研究資源 - 亮星中英對照表 Archived January 30, 2011, at the Wayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010.
  19. S2CID 16495089
    .
  20. ^ "ISDB neighbor search results".

External links

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