Adhara (HIP 33579)

Adhara is a blue giant star in the constellation Canis Major. At 405 light years away, it is the 23rd brightest star in the Earth's sky, where it shines at an apparent visual magnitude of 1.50. Adhara is a multiple-star system. The iron abundance of Adhara is -0.75 (17.8% of the Sun). It is moving through the Galaxy at a speed of 27.4 km/s relative to the Sun. Its projected Galactic orbit carries it between 20,900 and 24,400 light years from the center of the Galaxy. It came closest to the Sun 4.4 million years ago when it had brightened to magnitude -4.12 from a distance of 30 light years.

Sky position: RA 6h 58.6m, Dec -28 58.2'

Common designations: Adhara, Epsilon Canis Majoris, 21 Canis Majoris, HIP 33579, HD 52089

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Brightest stars in Canis Major:
(list all)

1

|    -1.44

)   Sirius

2

|    1.50

)   Adhara

3

|    1.83

)   Wezen

4

|    1.98

)   Mirzam

5

|    2.45

)   Aludra

6

|    3.02

)   Furud

7

|    3.02

)   Omicron-2 Canis Majoris

8

|    3.49

)   Sigma Canis Majoris

9

|    3.50

)   Kappa Canis Majoris

10

|    3.89

)   Omicron-1 Canis Majoris

11

|    3.95

)   Nu-2 Canis Majoris

12

|    4.01

)   Omega Canis Majoris

13

|    4.08

)   Theta Canis Majoris

14

|    4.11

)   Muliphein

15

|    4.34

)   Xi-1 Canis Majoris

16

|    4.36

)   Iota Canis Majoris

17

|    4.37

)   Tau Canis Majoris

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


Galactic Orbit of Adhara

(compared to the Sun)

Eccentricity: 7.8% vs. 16.0%

Angle φ : 169.5 vs. 26.0

Semi-major axis : 6,934 pc vs. 8,686 pc

Semi-minor axis: 6,913 pc vs. 8,574 pc

Focus-to-center: 538 pc vs. 1,388 pc

Semilatus rectum : 6,893 pc vs. 8,464 pc

Perigalacticon: 6,396 pc vs. 7,297 pc

Apogalacticon: 7,472 pc vs. 10,074 pc
 


Some Tabulated XHIP Data for Adhara
(see also: SIMBAD)

Astrometry
2007A&A...474..653V
  Position Proper Motion
Right Ascension: 104.65644415 0.09 mas 3.24 0.11 mas/yr.
Declination: -28.97208939 0.11 mas 1.33 0.16 mas/yr.
     
Galactic Longitude: 239.83105557 0.16 mas/yr.
Galactic Latitude: -11.32976162 3.50 mas/yr.

Parallax: 8.05 0.14 mas


Spectrography

Spectral Type: B1III 2009A&A...501..297Z.

Radial Velocity: 27.30 0.40 km/s [A rating] 2006AstL...32..759G.

Iron Abundance [Fe/H]: -0.75 dex  1992ApJ...387..673G.
 



Photometry
 
band magnitude Abs. Mag.
U 0.37 -5.10
B 1.29 -4.18
V 1.50 -3.97
R
I 1.70 -3.77
J
H
K

  B-V: -0.21       V-I: -0.20


Derivations

Heliocentric distance: 124.18 pc (1.7% margin of error)

Galactocentric distance: 7,462 pc

Transverse velocity: 2.1 km/s

3D heliocentric position and motion:

toward:   

Galactic center Galactic rotation North Galactic Pole
Position ( X, Y, Z) -61.2 pc -105.3 pc -24.4 pc
Velocity (U, V, W) -13.6 km/s -23.5 km/s -3.3 km/s

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