Rho Ursae Majoris

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Rho Ursae Majoris
Diagram showing star positions and boundaries of the Ursa Major constellation and its surroundings
Location of ρ Ursae Majoris (circled)
Observation data
ICRS
)
Constellation Ursa Major
Right ascension 09h 02m 32.69092s[1]
Declination +67° 37′ 46.6280″[1]
Apparent magnitude (V) 4.74[2]
Characteristics
Spectral type M3 III[3]
U−B color index +1.84[2]
B−V color index +1.56[2]
Distance
315 ± 8 ly
(96 ± 2 pc)
Absolute magnitude (MV)+0.06[5]
Details
Radius58[6] R☉
Luminosity464[7] L☉
Temperature3,725[7] K
HR 3576, SAO 14742[8]
Database references
SIMBADdata

Rho Ursae Majoris (ρ UMa) is the

light years
.

With a stellar classification of M3 III,[3] this is a red giant star on the asymptotic giant branch.[10] It is a suspected small amplitude variable.[11] The measured angular diameter of the star after correcting for limb darkening is 5.64±0.15 mas,[12] which, at the estimated distance of this star, yields a physical size of about 58 times the radius of the Sun.[6] It is radiating 464 times the solar luminosity from its outer atmosphere at an effective temperature of about 3,725 K.[7] Based upon its motion through space, there is a 60.6% chance that this star is a member of the Sirius stream.[5]

Naming

  • With π1, π2, σ1, σ2, A and d, it composed the Arabic asterism Al Ṭhibā᾽, the Gazelle.[13] According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Al Ṭhibā were the title for seven stars : A as Althiba I, π1 as Althiba II, π2 as Althiba III, this star (ρ) as Althiba IV, σ1 as Althiba V, σ2 as Althiba VI, and d as Althiba VII[14]
  • In
    Chinese name for ρ Ursae Majoris itself is 三師一 (Sān Shī yī, English: the First Star of Three Top Instructors.).[15]

References

  1. ^
    S2CID 18759600
    .
  2. ^
    Bibcode:1986EgUBV........0M
    .
  3. ^
    doi:10.1051/0004-6361:20030647
    .
  4. S2CID 59451347
    , A61.
  5. ^
    S2CID 17804304
    .
  6. ^
    ISBN 3-540-29692-1
    . The radius (R*) is given by:
  7. ^
    S2CID 118665352
    .
  8. ^ "rho UMa". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-02-25.{{cite web}}: CS1 maint: postscript (link)
  9. S2CID 14878976
    .
  10. doi:10.1086/116239
    .
  11. doi:10.1086/133420
    .
  12. doi:10.1051/0004-6361:20042039
    .
  13. Allen, Richard Hinckley
    (1899), Star-Names and Their Meanings, New York: G. E. Stechert, p. 444
  14. ^ Rhoads, Jack W. (November 15, 1971), Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars (PDF), Jet Propulsion Laboratory, California Institute of Technology.
  15. ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 16 日 Archived 2012-02-04 at the Wayback Machine
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