61 Ursae Majoris

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61 Ursae Majoris
Observation data
Epoch J2000      Equinox J2000
Constellation Ursa Major
Right ascension 11h 41m 03.0153s[1]
Declination +34° 12′ 05.888″[1]
Apparent magnitude (V) 5.35[2]
Characteristics
Spectral type G8V[3]
U−B color index +0.27[4]
B−V color index +0.69[4]
R−I color index 0.37[citation needed]
Variable type Suspected
Astrometry
Radial velocity (Rv) −5.4[5] km/s
Proper motion (μ) RA: −13.95[1] mas/yr
Dec.: −380.46[1] mas/yr
Parallax (π) 104.81 ± 0.72[1] mas
Distance 31.1 ± 0.2 ly
(9.54 ± 0.07 pc)
Absolute magnitude (MV) 5.41
Details
Mass 0.85[6] M☉
Radius 0.940 ± 0.010[7] R☉
Luminosity 0.609 ± 0.009[7] L☉
Surface gravity (log g) 4.69[2] cgs
Temperature 5,270 ± 32[7] K
Metallicity [Fe/H] +0.03[2] dex
Rotation 17.1 days[8]
Rotational velocity (v sin i) 8[9] km/s
Age 0.8–1.2[10] Gyr
Other designations
BD +35°2270, FK5 1300, GCTP 2699.00, GJ 434, HD 101501, HIP 56997, HR 4496, LTT 13200, SAO 62655, NSV 5291.
Database references
SIMBAD data

61 Ursae Majoris (61 UMa) is an orange-yellow G8 main-sequence star in the constellation Ursa Major. This star is somewhat smaller and fainter than the Sun, and can just barely be seen by the unaided eye (based on a magnitude limit of 6). Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified.[11]

No substellar companions have been observed in orbit around this star, and it appears to lack a dust ring as is found around some comparable stars. It lies near the same line of sight as the sub-giant star HD 101212, although it is unclear whether these two stars are gravitationally bound or even in physical proximity.

The space velocity components of this star are [U, V, W] = [+8, −16, −4] km/s. It is orbiting the galaxy at a mean distance of 7.9 kpc (26×10^3 ly) from the core with an eccentricity of 0.06.[12]

See also

References

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External links

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  6. ↑ Lua error in package.lua at line 80: module 'strict' not found. Note: see VizieR catalogue J/ApJS/168/297.
  7. ↑ 7.0 7.1 7.2 Lua error in package.lua at line 80: module 'strict' not found.. See Table 10.
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