Lambda Ursae Majoris

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Lambda Ursae Majoris
Diagram showing star positions and boundaries of the Ursa Major constellation and its surroundings
Diagram showing star positions and boundaries of the Ursa Major constellation and its surroundings

Location of λ Ursae Majoris (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ursa Major
Right ascension 10h 17m 05.78287s[1]
Declination +42° 54′ 51.6808″[1]
Apparent magnitude (V) +3.45[2]
Characteristics
Spectral type A2 IV[3]
U−B color index +0.06[2]
B−V color index +0.03[2]
Distance
138 ± 5 ly
(42 ± 1 pc)
Absolute magnitude (MV)+0.10[5]
Details
Myr
HIP 50372, HR 4033, PPM 51795, SAO 43268.[10]
Database references
SIMBADdata

Lambda Ursae Majoris (λ Ursae Majoris, abbreviated Lambda UMa, λ UMa), formally named Tania Borealis

circumpolar constellation of Ursa Major
.

Properties

This star has an

A-type star.[14]

Nomenclature

λ Ursae Majoris (Latinised to Lambda Ursae Majoris) is the star's Bayer designation.

It bore the traditional names Tania (shared with Mu Ursae Majoris) and Tania Borealis. Tania comes from the Arabic phrase Al Fiḳrah al Thānia 'the Second Spring (of the Gazelle)'.[15] and Borealis (originally borealis[16]) is Latin for 'the north side'. In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[17] to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016[18] included a table of the first two batches of names approved by the WGSN; which included Tania Borealis for this star.

In

Chinese name for Lambda Ursae Majoris itself is 中台一 (Zhōng Tái yī, English: Star of First Middle Step).[19]

References

  1. ^
    S2CID 18759600
  2. ^
    Bibcode:1966CoLPL...4...99J
  3. ^
    doi:10.1086/110819
  4. Bibcode:1967IAUS...30...57E
  5. S2CID 122285420
    .
  6. ^
    S2CID 33401607
    .
  7. ^
    Bibcode:1990A&AS...85.1015M
  8. ^
    Bibcode:1995A&A...294..536H
  9. S2CID 18475298
  10. Centre de Données astronomiques de Strasbourg
    , retrieved 2012-01-20
  11. ISBN 978-1-931559-44-7
    .
  12. ^ "IAU Catalog of Star Names". Retrieved 28 July 2016.
  13. S2CID 14116473
  14. Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original
    on March 18, 2012, retrieved 2012-01-16
  15. ^ Richard Hinckley Allen :Star Names — Their Lore and Meaning - Ursa Major, the Greater Bear
  16. ^ Piazzi, G., The Palermo Catalogue, Palermo, 1814.
  17. ^ "IAU Working Group on Star Names (WGSN)". Retrieved 22 May 2016.
  18. ^ "Bulletin of the IAU Working Group on Star Names, No. 1" (PDF). Retrieved 28 July 2016.
  19. ^ (in Chinese) (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 21 日 Archived 2016-03-03 at the Wayback Machine
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