Diadem, a white main-sequence star in Coma Berenices
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 (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
Brightest stars in Coma Berenices:
(list all)
| Rank | Mag. | Star |
| 1 | 4.23 | Beta Comae Berenices |
2
| 4.32
) Diadem
| Rank | Mag. | Star |
| 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 |
Hover over other bright stars to identify or click to jump.
Galactic Orbit of Diadem
(compared to the Sun)
E
ccentricity: 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 pcvs. 1,388 pcSemilatus rectum : 7,732 pc vs. 8,464 pc
Perigalacticon: 6,851 pc vs. 7,297 pc
Apogalacticon
: 8,871 pcvs. 10,074 pcSome 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 |