Alathfar (HIP 90191)

Alathfar is a white main-sequence star in the constellation Lyra. At 439 light years away, it shines at an apparent visual magnitude of 5.11. It is moving through the Galaxy at a speed of 27.7 km/s relative to the Sun. Its projected Galactic orbit carries it between 18,700 and 24,100 light years from the center of the Galaxy. It will come closest to the Sun 4.1 million years from now when it will brighten to magnitude 3.61 from a distance of 219 light years.

Sky position: RA 18h 24.2m, Dec +39 30.6'

Common designations: Alathfar, Mu Lyrae, 2 Lyrae, HIP 90191, HD 169702, HR 6903

Splendors of the Universe

Magnificent Monthly Calendar


Brightest stars in Lyra:
(list all)

6

|    4.33

)   Kappa Lyrae

7

|    4.34

)   Zeta-1 Lyrae

8

|    4.35

)   Theta Lyrae

9

|    4.43

)   Aladfar

10

|    4.59

)   Epsilon-2 Lyrae

11

|    4.67

)   Epsilon-1 Lyrae

12

|    4.83

)   HR 7064

13

|    4.94

)   Lambda Lyrae

14

|    5.00

)   16 Lyrae

15

|    5.11

)   Alathfar

16

|    5.20

)   HR 7162

17

|    5.20

)   17 Lyrae

18

|    5.22

)   Nu Lyrae

19

|    5.25

)   Iota Lyrae

20

|    5.26

)   HR 7181

21

|    5.41

)   HR 6997

22

|    5.46

)   HR 7146

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


Galactic Orbit of Alathfar

(compared to the Sun)

Eccentricity: 12.5% vs. 16.0%

Angle φ : 165.8 vs. 26.0

Semi-major axis : 6,565 pc vs. 8,686 pc

Semi-minor axis: 6,514 pc vs. 8,574 pc

Focus-to-center: 820 pc vs. 1,388 pc

Semilatus rectum : 6,463 pc vs. 8,464 pc

Perigalacticon: 5,745 pc vs. 7,297 pc

Apogalacticon: 7,385 pc vs. 10,074 pc
 


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

Astrometry
2007A&A...474..653V
  Position Proper Motion
Right Ascension: 276.05750742 0.13 mas -21.18 0.15 mas/yr.
Declination: 39.50724977 0.12 mas -4.90 0.17 mas/yr.
     
Galactic Longitude: 67.32948276 -11.16 mas/yr.
Galactic Latitude: 21.80279990 18.66 mas/yr.

Parallax: 7.43 0.16 mas


Spectrography

Spectral Type: A2V 1995ApJS...99..135A.

Radial Velocity: -24.00 4.20 km/s [A rating] 2006AstL...32..759G.

Iron Abundance [Fe/H]: n/a
 



Photometry
 
band magnitude Abs. Mag.
U
B 5.16 -0.49
V 5.11 -0.53
R
I 5.06 -0.58
J 4.92 -0.73
H 4.95 -0.69
K 4.86 -0.79

  B-V: +0.05       V-I: +0.05


Derivations

Heliocentric distance: 134.51 pc (2.2% margin of error)

Galactocentric distance: 7,353 pc

Transverse velocity: 13.9 km/s

3D heliocentric position and motion:

toward:   

Galactic center Galactic rotation North Galactic Pole
Position ( X, Y, Z) 48.1 pc 115.2 pc 50.0 pc
Velocity (U, V, W) -3.7 km/s -27.4 km/s 2.1 km/s

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