Eta Ursae Minoris

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Template:Short description

Eta Ursae Minoris
Template:Location mark
Location of η Ursae Minoris (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Ursa Minor
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) +4.95[2]
Characteristics
Evolutionary stage main sequence[3]
Spectral type F5 V[4]
U−B Template:Engvar +0.02[2]
B−V Template:Engvar +0.35[2]
Astrometry
Radial velocity (Rv)Script error: No such module "val".[5] km/s
Proper motion (μ) RA: −77.647[1] mas/yr
Dec.: +245.726[1] mas/yr
Parallax (π)33.4190±0.1103 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)+2.61[6]
Details
Mass1.539[1] Template:Solar mass
Radius2.024[1] Template:Solar radius
Luminosity7.725[1] Template:Solar luminosity
Surface gravity (log g)Script error: No such module "val".[7] cgs
Temperature6,764[1] K
Metallicity [Fe/H]−0.02[8] dex
Rotational velocity (v sin i)84.8[3] km/s
Age1.743[1] Gyr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[9]
Database references
SIMBADdata

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Eta Ursae Minoris (Latinized from η Ursae Minoris) is a yellow-white hued star in the northern circumpolar constellation of Ursa Minor.

This is an F-type main-sequence star of stellar classification F5 V with an apparent magnitude of +4.95, making it faintly visible to the naked eye.[10] Based upon an annual parallax shift of 33.4 mas as seen from the Earth, it is located 98 light years from the Sun. The star is moving closer to the Sun with a radial velocity of −11 km/s,[5] and is traversing the sky with a relatively high proper motion of 0.271 arc seconds per year.[11]

Eta Ursae Minoris is about 1.7 billion years old and has 1.54 times the mass of the Sun.[1] It has a high rate of spin with a projected rotational velocity of 84.8 km/s.[3] These coordinates mark a source of X-ray emission with a luminosity of Script error: No such module "val"..[6] Eta Ursae Minoris may form a wide binary system with a magnitude 15.3 companion star, located at an angular separation of 228.5 arc seconds.[4]

In some Arabic star charts it is labeled انور الفرقدين ʼanwar al-farqadayn, "the brighter of the two calves", and paired with ζ Ursae Minoris as اخفي الفرقدين akhfā al-farkadain "the dimmer of the two calves". The names may originally refer to a pair of Ibexes, and are more properly applied to β UMi and γ UMi respectively, the brighter two stars in the rectangle of Ursa Minor.[12]

References

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  1. ↑ a b c d e f g h i j k Template:Cite Gaia DR3
  2. ↑ a b c Script error: No such module "citation/CS1". See the SIMBAD Measurements entry for details.
  3. ↑ a b c Script error: No such module "citation/CS1".
  4. ↑ a b Script error: No such module "citation/CS1".
  5. ↑ a b Script error: No such module "citation/CS1".
  6. ↑ a b Script error: No such module "citation/CS1".
  7. ↑ Script error: No such module "citation/CS1".
  8. ↑ Script error: No such module "citation/CS1".
  9. ↑ Template:Cite simbad
  10. ↑ Script error: No such module "citation/CS1".
  11. ↑ Script error: No such module "citation/CS1".
  12. ↑ Script error: No such module "citation/CS1".

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Template:Stars of Ursa Minor

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