Theta Ursae Minoris

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θ Ursae Minoris
Location of θ Ursae Minoris (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ursa Minor
Right ascension 15h 31m 25.05417s[1]
Declination +77° 20′ 57.6199″[1]
Apparent magnitude (V) 4.982[2]
Characteristics
Spectral type K5-III CN0.5[3]
B−V color index +1.553[2]
Variable type suspected[4]
Distance
860 ± 80 ly
(260 ± 30 pc)
Absolute magnitude (MV)−2.04[6]
Details
dex
HR 5826, SAO 8274[10]
Database references
SIMBADdata

Theta Ursae Minoris,

apparent visual magnitude of 5.0.[2] The system is moving closer to the Sun with a radial velocity of −25 km/s.[5]

This is a probable

spectroscopic binary
with two roughly equal components.
Sun's luminosity from an expanded photosphere at an effective temperature of 3,962 K.[9]

Photometry from the Hipparcos satellite mission shows that θ Ursae Minoris varies in brightness by a few hundredths of a magnitude. It is listed as NSV 20342 in the New Catalogue of Suspected Variable Stars.[12]

References

  1. ^
    S2CID 18759600
    .
  2. ^
    doi:10.1888/0333750888/2862
    .
  3. ^
    doi:10.1086/191373
    .
  4. Bibcode:1997A&A...323L..49P
    .
  5. ^
    S2CID 59451347
    , A61.
  6. S2CID 13946698
    .
  7. ^
    S2CID 425754
    .
  8. ^
    S2CID 118665352
    .
  9. ^
    S2CID 54940439
    , A165.
  10. ^ "* tet UMi". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 16 June 2014.
  11. S2CID 14878976
    .
  12. Bibcode:2009yCat....102025S
    .
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