Diadem (HIP 64241)

Diadem is a white main-sequence star in the constellation Coma Berenices. At 58 light years away, it shines at an apparent visual magnitude of 4.32. Diadem is a multiple-star system. The star's age is estimated to be 2.6 billion years but is certainly no less than 2.4 billion years and no greater than 2.8 billion years. The iron abundance of Diadem is -0.18 (66.1% of the Sun). It is moving through the Galaxy at a speed of 41.4 km/s relative to the Sun. Its projected Galactic orbit carries it between 22,300 and 28,900 light years from the center of the Galaxy.

Sky position: RA 13h 10.0m, Dec +17° 31.8'

Common designations: Diadem, Alpha Comae Berenices, 42 Comae Berenices, HIP 64241, HD 114378

Splendors of the Universe

Magnificent Monthly Calendar

Brightest stars in Coma Berenices:
(list all)

1

|    4.23

)   Beta Comae Berenices

2

|    4.32

)   Diadem

3

|    4.35

)   Gamma Comae Berenices

4

|    4.72

)   11 Comae Berenices

5

|    4.76

)   36 Comae Berenices

6

|    4.78

)   12 Comae Berenices

7

|    4.80

)   23 Comae Berenices

8

|    4.80

)   41 Comae Berenices

9

|    4.88

)   37 Comae Berenices

10

|    4.89

)   35 Comae Berenices

11

|    4.92

)   14 Comae Berenices

12

|    4.93

)   7 Comae Berenices

13

|    4.93

)   31 Comae Berenices

14

|    4.98

)   16 Comae Berenices

15

|    4.99

)   HR 4668

16

|    5.03

)   24 Comae Berenices A

17

|    5.09

)   6 Comae Berenices

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

Galactic Orbit of Diadem
(compared to the Sun)

Eccentricity: 12.9% vs. 16.0%

Angle φ : -69.4° vs. 26.0°

Semi-major axis : 7,861 pc vs. 8,686 pc

Semi-minor axis: 7,796 pc vs. 8,574 pc

Focus-to-center: 1,010 pc vs. 1,388 pc

Semilatus rectum : 7,732 pc vs. 8,464 pc

Perigalacticon: 6,851 pc vs. 7,297 pc

Apogalacticon: 8,871 pc vs. 10,074 pc
 
Some Tabulated XHIP Data for Diadem
(see also: SIMBAD)

Astrometry
 2007A&A...474..653V
  Position Proper Motion
Right Ascension: 197.49812571° ±0.72 mas -430.10 ±0.90 mas/yr.
Declination: 17.52911197° ±0.64 mas 137.80 ±0.90 mas/yr.
     
Galactic Longitude: 327.93800598° -340.84 mas/yr.
Galactic Latitude: 79.48865590° 296.31 mas/yr.

Parallax: 56.10 ± 0.89 mas

Spectrography

Spectral Type: F5V 1950ApJ...112..554R.

Radial Velocity: -16.05 ±0.21 km/s [D rating] 2010A&A...521A..12M, 2006AstL...32..759G.

Iron Abundance [Fe/H]: -0.18 dex  2009A&A...501..941H, 2006AJ....131.3069L, 2004A&A...420..183A.
 


Photometry
 
band magnitude Abs. Mag.
U
B 4.78 3.52
V 4.32 3.07
R 4.10 2.85
I 3.90 2.65
J 3.40 2.14
H 3.27 2.01
K 3.11 1.85

  B-V: +0.46       V-I: +0.42

Derivations

Heliocentric distance: 17.82 pc (1.6% margin of error)

Galactocentric distance: 7,397 pc

Transverse velocity: 38.2 km/s

3D heliocentric position and motion:

toward:   

Galactic center Galactic rotation North Galactic Pole
Position ( X, Y, Z) 2.8 pc -1.7 pc 17.5 pc
Velocity (U, V, W) -38.6 km/s -9.8 km/s -11.2 km/s

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