Ny Ursae Majoris

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Double star
Ny Ursae Majoris
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Big Bear
Right ascension 11 h 18 m 28.74 s
declination + 33 ° 05 ′ 39.5 ″
Apparent brightness A: 3.5 mag
Typing
B − V color index +1.40 
U − B color index +1.55 
R − I index +0.70 
Spectral class K3 III
Astrometry
Radial velocity (−9.6 ± 0.4) km / s
parallax (8.17 ± 0.17)  mas
distance (399 ± 8)  ly
(122 ± 3)  pc  
Proper movement 
Rec. Share: (−26.84 ± 0.19)  mas / a
Dec. portion: (+28.69 ± 0.15)  mas / a
Physical Properties
Other names
and catalog entries
Bayer name ν Ursae Majoris
Flamsteed name 54 Ursae Majoris
Bonn survey BD + 33 ° 2098
Bright Star Catalog HR 4377 [1]
Henry Draper Catalog HD 98262 [2]
Hipparcos catalog HIP 55219 [3]
SAO catalog SAO 62486 [4]
Tycho catalog TYC 2520-2631-1 [5]
Other names FK5  425 • Σ 1524 • ADS 8123 • WDS J11185 + 3306

Ny Ursae Majoris ( ν UMa for short ) is a double star in the constellation Great Bear . The central star is a giant of the spectral class K3 and has an apparent magnitude of 3.5 mag. The system is around 400 light years from the sun . The angular distance of the companion is around 7 arc seconds.

The star bears the historical proper name Alula Borealis .

The IAU has the historical proper names on July 20, 2016 Alula Borealis defined as standardized proper names. It is pointed out, however, that this proper name is only valid for the visually lighter component A. The visually weaker star of this binary system therefore has no proper name (yet).

swell

  1. ↑ SIMBAD database
  2. ↑ a b c d Hipparcos catalog
  3. ↑ a b c Bright Star Catalog
  4. ↑ Bulletin of the IAU Working Group on Star Names, No. 1, July 2016. (PDF) Retrieved November 9, 2016 (English, 184 KiB).