Zeta Ursae Minoris

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ζ Ursae Minoris
Location of ζ Ursae Minoris (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ursa Minor
Right ascension 15h 44m 03.51892s[1]
Declination +77° 47′ 40.1788″[1]
Apparent magnitude (V) +4.29[2]
Characteristics
Spectral type A3Vn[3]
U−B color index +0.05[4]
B−V color index 0.038±0.005[2]
Variable type Suspected δ Sct[5]
Distance
369 ± 5 ly
(113 ± 2 pc)
Absolute magnitude (MV)−0.98[2]
Details
Myr
HR 5903, SAO 8328[11]
Database references
SIMBADdata

Zeta Ursae Minoris, which is

apparent visual magnitude of +4.28. It is located at a distance of approximately 369 light-years from the Sun based on parallax,[1] but is drifting further closer with a radial velocity of about –13 km/s.[6]

A light curve for Zeta Ursae Minoris, plotted from TESS data. The main plot shows the flux as a function of time, and the inset plot shows the same data (excluding the eclipse) folded with the pulsation period.[14]

The

projected rotational velocity of 210 km/s, which is creating an equatorial bulge that is estimated to be 10% larger than the polar radius.[9]

Zeta Ursae Minoris is about 180

circumstellar disk.[10] A black body fit to the data yields a mean dust temperature of 160 K and an orbital radius of 42.5 AU.[8]

In some Arabic star charts it is listed as أخفى الفرقدين ʼakhfā al-farqadayn, meaning "the dimmer of the two calves", and paired with

β UMi, respectively, the brighter two stars in the rectangle of Ursa Minor.[15]

References

  1. ^
    S2CID 18759600
    .
  2. ^
    S2CID 119257644
    .
  3. ^
    doi:10.1086/110819
    .
  4. Bibcode:1966CoLPL...4...99J
    .
  5. ^
    Bibcode:1970IBVS..427....1F
    .
  6. ^
    S2CID 119231169
    .
  7. ^ a b Kaler, James B. "Alifa al Farkadain". Stars. University of Illinois. Retrieved 21 June 2014.
  8. ^
    S2CID 118438871
    . 15.
  9. ^
    S2CID 119273474
    .
  10. ^
    S2CID 14116473
    .
  11. ^ "zet UMi". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-01-08.
  12. S2CID 14878976
    .
  13. ISBN 9781139493680
    .
  14. ^ a b "zet UMi". The International Variable Star Index. AAVSO. Retrieved 16 October 2022.
  15. ^ Allen, Richard Hinckley (1899). Star-names and Their Meanings. G. E. Stechert. pp. 447–460.
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