Alula Borealis (HIP 55219)

Alula Borealis is an orange subgiant star in the constellation Ursa Major. At 399 light years away, it is the 282nd brightest star in the Earth's sky, where it shines at an apparent visual magnitude of 3.49. Alula Borealis is a multiple-star system. The iron abundance of Alula Borealis is -0.11 (77.6% of the Sun). It is moving through the Galaxy at a speed of 24 km/s relative to the Sun. Its projected Galactic orbit carries it between 24,300 and 41,000 light years from the center of the Galaxy.

Sky position: RA 11h 18.5m, Dec +33 5.4'

Common designations: Alula Borealis, Nu Ursae Majoris, 54 Ursae Majoris, HIP 55219, HD 98262

Stars of the Northern Hemisphere

The Modern Guide to the Stars


Brightest stars in Ursa Major:
(list all)

5

|    2.34

)   Merak

6

|    2.41

)   Phad

7

|    3.00

)   Psi Ursae Majoris

8

|    3.06

)   Tania Australis

9

|    3.12

)   Talitha

10

|    3.17

)   Theta Ursae Majoris

11

|    3.32

)   Megrez

12

|    3.35

)   Muscida

13

|    3.45

)   Tania Borealis

14

|    3.49

)   Alula Borealis

15

|    3.57

)   Kappa Ursae Majoris

16

|    3.65

)   23 Ursae Majoris

17

|    3.69

)   Alkaphrah

18

|    3.78

)   Upsilon Ursae Majoris

19

|    3.99

)   Alcor

20

|    4.46

)   15 Ursae Majoris

21

|    4.47

)   26 Ursae Majoris

Location of Alula Borealis circled
Map detail from Stars of the Northern Hemisphere
Hover over other bright stars to identify or click to jump.


Galactic Orbit of Alula Borealis

(compared to the Sun)

Eccentricity: 25.7% vs. 16.0%

Angle φ : -1.5 vs. 26.0

Semi-major axis : 10,012 pc vs. 8,686 pc

Semi-minor axis: 9,677 pc vs. 8,574 pc

Focus-to-center: 2,569 pc vs. 1,388 pc

Semilatus rectum : 9,353 pc vs. 8,464 pc

Perigalacticon: 7,443 pc vs. 7,297 pc

Apogalacticon: 12,581 pc vs. 10,074 pc
 


Some Tabulated XHIP Data for Alula Borealis
(see also: SIMBAD)

Astrometry
2007A&A...474..653V
  Position Proper Motion
Right Ascension: 169.61981388 0.15 mas -26.40 0.60 mas/yr.
Declination: 33.09423879 0.12 mas 27.30 0.60 mas/yr.
     
Galactic Longitude: 190.72722416 -22.08 mas/yr.
Galactic Latitude: 69.08112043 -30.90 mas/yr.

Parallax: 8.17 0.17 mas


Spectrography

Spectral Type: K0IV 2008ApJS..176..216A.

Radial Velocity: -9.63 0.38 km/s [A rating] 2005A&A...430..165F.

Iron Abundance [Fe/H]: -0.11 dex  1990ApJS...74.1075M.
 



Photometry
 
band magnitude Abs. Mag.
U
B 4.89 -0.55
V 3.49 -1.95
R
I 2.29 -3.15
J 1.07 -4.36
H 0.18 -5.25
K 0.28 -5.16

  B-V: +1.40       V-I: +1.20


Derivations

Heliocentric distance: 122.34 pc (2.1% margin of error)

Galactocentric distance: 7,444 pc

Transverse velocity: 22.0 km/s

3D heliocentric position and motion:

toward:   

Galactic center Galactic rotation North Galactic Pole
Position ( X, Y, Z) -42.9 pc -8.1 pc 114.3 pc
Velocity (U, V, W) -15.5 km/s 10.1 km/s -15.4 km/s

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