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Dubhe information


Dubhe
Location of Dubhe (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ursa Major
Right ascension 11h 03m 43.67152s[1]
Declination +61° 45′ 03.7249″[1]
Apparent magnitude (V) 1.79[2] (1.87 + 4.85)[3]
Characteristics
Spectral type K0III[4] + A5V[3]
U−B color index +0.93[2]
B−V color index +1.07[2]
Variable type Suspected[5]
Astrometry
Radial velocity (Rv)−9.4±0.3[6] km/s
Proper motion (μ) RA: –134.11[1] mas/yr
Dec.: –34.70[1] mas/yr
Parallax (π)26.54 ± 0.48 mas[1]
Distance123 ± 2 ly
(37.7 ± 0.7 pc)
Absolute magnitude (MV)−1.10±0.04[7]
Orbit[3]
Companionα UMa B
Period (P)44.45±0.11 yr
Semi-major axis (a)0.590±0.026
Eccentricity (e)0.439±0.004
Inclination (i)159.9±3.5°
Longitude of the node (Ω)9.3±8.2°
Periastron epoch (T)2,002.17±0.09
Argument of periastron (ω)
(secondary)
232.8±7.9°
Details
α UMa A
Mass3.7±0.4[3] M
Radius26.85[8] R
Luminosity339[9] L
Surface gravity (log g)2.22[3] cgs
Temperature4,650[3] K
Metallicity [Fe/H]–0.15[3] dex
Rotation<1.35[3] years
Rotational velocity (v sin i)2.63±0.15[3] km/s
Age280±30[10] Myr
α UMa B
Mass2.5±0.4[3] M
Other designations
Dubhe, Ak, α Ursae Majoris, α UMa, Alpha UMa, 50 UMa, NSV 5070, BD+62°1161, FK5 417, GC 15185, HD 95689, HIP 54061, HR 4301, SAO 15384, PPM 17705, ADS 8035, CCDM J11037+6145AB, WDS J11037+6145AB[11]
Database references
SIMBADdata

Dubhe /ˈdʌb/, also called Alpha Ursae Majoris, Latinised from α Ursae Majoris,[12][13] is, despite being designated "α" (alpha), the second-brightest object in the northern constellation of Ursa Major. This prominent asterism is known as the Big Dipper, the Plough, and the Great Bear. Alpha Ursae Majoris is the northern of the 'pointers' (or 'guards'), the second being Beta Ursae Majoris, or 'Merak' – this pair of stars point towards Polaris, the North Star.[14]

  1. ^ a b c d e Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference clpl4_99 was invoked but never defined (see the help page).
  3. ^ a b c d e f g h i j Cite error: The named reference Gray2018 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference guenther was invoked but never defined (see the help page).
  5. ^ Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  6. ^ Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference aj135_3_892 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference gray2019 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Luck2015 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Baines_et_al_2017 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Kunitzsch was invoked but never defined (see the help page).
  13. ^ "IAU Catalog of Star Names". Retrieved 28 July 2016.
  14. ^ Cite error: The named reference Streicher2009 was invoked but never defined (see the help page).

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Dubhe

Last Update:

Dubhe /ˈdʌbiː/, also called Alpha Ursae Majoris, Latinised from α Ursae Majoris, is, despite being designated "α" (alpha), the second-brightest object...

Word Count : 1279

Ursa Major

Last Update:

configuration mimics the shape of the "Little Dipper". Two of its stars, named Dubhe and Merak (α Ursae Majoris and β Ursae Majoris), can be used as the navigational...

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Big Dipper

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imaginary line through the front two stars of the asterism, Merak (β) and Dubhe (α). This makes it useful in celestial navigation. The constellation of...

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List of Saint Seiya characters

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creatures from Norse mythology and named after the stars of Ursa Major. Dubhe Alpha Siegfried (α星ドゥベのジークフリート, Arufa-sei Dube no Jīkufurīto) Voiced by:...

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Polaris

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in the constellation Ursa Major. The leading edge (defined by the stars Dubhe and Merak) is referenced to a clock face, and the true azimuth of Polaris...

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Messier 81

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galaxy is to be found approximately 10° northwest of Alpha Ursae Majoris (Dubhe) along with several other galaxies in the Messier 81 Group. Its apparent...

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Ursa Major moving group

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discovered in 1869 by Richard A. Proctor, who noticed that, except for Dubhe and Alkaid (Eta Ursae Majoris), the stars of the Big Dipper asterism all...

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Phecda

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forming the bowl of the Big Dipper, together with Alpha Ursae Majoris (Dubhe, upper-right), Beta Ursae Majoris (Merak, lower-right) and Delta Ursae Majoris...

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Pointer

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and Beta Centauri, which point to the Southern Cross Alpha Ursae Majoris (Dubhe) and Beta Ursae Majoris (Merak), which point to Polaris Pointer (wireless...

Word Count : 326

Chinese constellations

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Chinese astronomy in the same order as with the Bayer designations, with Dubhe first in both cases. For example, Altair is named 河鼓二 in Chinese. 河鼓 is...

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Shapolang

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Lang (traditional Chinese: 貪狼; simplified Chinese: 贪狼; pinyin: Tān Láng; lit. 'Greedy Wolf'), equivalent to Dubhe, symbolising lust. v t e v t e v t e...

Word Count : 114

Saptarshi

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Indian Name Bayer Designation Western Name Kratu α UMa Dubhe Pulaha β UMa Merak Pulastya γ UMa Phecda Atri δ UMa Megrez Angiras ε UMa Alioth Vasistha...

Word Count : 1276

Mizar

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after Arundhati, the wife of Vasishta ... today known by their Arabic names Dubhe (Kratu), Merak (Pulaha), Phekda (Pulastya), Megrez (Atri), Benetnash (Marichi)...

Word Count : 2170

List of brightest stars

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III Southern 33 1.77 Alioth ε UMa 0083 A1 III-IVp kB9 Northern 34 1.79 Dubhe α UMa 0120 K0 III, F0 V Northern 35 1.80 Mirfak α Per 0510 F5 Ib Northern...

Word Count : 1309

Mizar and Alcor

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after Arundhati, the wife of Vasishta ... today known by their Arabic names Dubhe (Kratu), Merak (Pulaha), Phekda (Pulastya), Megrez (Atri), Benetnash (Marichi)...

Word Count : 1751

Kui Xing

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name of the star in the Big Dipper located furthest from the 'handle' - Dubhe. In Daoist tradition, Kui Xing is said to have been "bent and hunchbacked...

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List of stars for navigation

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Centre de données astronomiques de Strasbourg. Retrieved 2010-06-21. "Dubhe". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2010-06-21...

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Alkaid

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and Alioth; while the four stars of the bowl, Megrez, Phecda, Merak, and Dubhe, are the bier. It is known as Běidǒuqī (北斗七 - the Seventh Star of the Northern...

Word Count : 1188

List of stars in Ursa Major

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dwarf companion?; α² CVn variable Dubhe α 50 95689 54061 11h 03m 43.84s +61° 45′ 04.0″ 1.79 −1.08 124 K0III + F0V Dubhe, Dubh, Dubb, Thahr al Dub al Akbar...

Word Count : 93

Siegfried

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Small Siegfried, a character in the Soulcalibur series of fighting games Dubhe Alpha Siegfried, Saint Seiya anime series character Siegfried Kircheis,...

Word Count : 638

List of Arabic star names

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Dschubba al-Jab'hah the Forehead (of the scorpion) الجبهة Delta Scorpii Dubhe Kāhil ud-Dubb (the back of) the Bear كاهل الدّب Alpha Ursae Majoris Dziban...

Word Count : 565

List of proper names of stars

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// Scorpius δ Scorpii A Dschubba /ˈdʒʌbə/ Ursa Major α Ursae Majoris A Dubhe Member of the Big Dipper or the Plough (UK). /ˈdʌbiː/ Draco ψ1 Draconis...

Word Count : 2126

Hero Tales

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Hokushin-Tenkun mark of Dubhe, Tonrō (貪狼), on his left shoulder which means that he is the incarnation of the war and celestial god dubhe. A general of the...

Word Count : 4106

List of largest stars

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red giant to the Earth, and the fourth brightest star in the night sky. Dubhe (α Ursae Majoris A) 17.03±0.13 AD Thirty-fourth brightest star in the sky...

Word Count : 9523

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