Nekkar, a yellow giant star in Boötes
Nekkar is a yellow giant star in the constellation Boötes. At 225 light years away, it is the 283rd brightest star in the Earth's sky, where it shines at an apparent visual magnitude of 3.49.
Nekkar (HIP 73555)
Nekkar is a yellow giant star in the constellation Boötes. At 225 light years away, it is the 283rd brightest star in the Earth's sky, where it shines at an apparent visual magnitude of 3.49. The iron abundance of Nekkar is +0.03 (107.2% of the Sun). It is moving through the Galaxy at a speed of 24.5 km/s relative to the Sun. Its projected Galactic orbit carries it between 20,400 and 24,400 light years from the center of the Galaxy. It will come closest to the Sun 2.1 million years from now when it will brighten to magnitude 2.59 from a distance of 149 light years.
Sky position: RA 15h 1.9m, Dec +40° 23.4'
Common designations: Nekkar, Beta Boötis, 42 Boötis, HIP 73555, HD 133208, HR 5602
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Brightest stars in Boötes:
(list all)
1
| -0.05
) Arcturus
| Rank | Mag. | Star |
| 2 | 2.35 | Izar |
| 3 | 2.68 | Mufrid |
| 4 | 3.04 | Seginus |
| 5 | 3.46 | Princeps |
6
| 3.49
) Nekkar
| Rank | Mag. | Star |
| 7 | 3.57 | Rho Boötis |
| 8 | 3.78 | Zeta Boötis |
| 9 | 4.04 | Asellus Primus |
| 10 | 4.05 | Upsilon Boötis |
| 11 | 4.18 | Lambda Boötis |
| 12 | 4.31 | Alkalurops |
| 13 | 4.47 | Sigma Boötis |
| 14 | 4.49 | Pi-1 Boötis |
| 15 | 4.50 | Tau Boötis |
| 16 | 4.52 | Psi Boötis |
| 17 | 4.53 | Asellus Tertius |
Hover over other bright stars to identify or click to jump.
Galactic Orbit of Nekkar
(compared to the Sun)
E
ccentricity: 8.9% vs. 16.0%Angle φ : 151.2°vs. 26.0°
Semi-major axis : 6,865 pc vs. 8,686 pc
Semi-minor axis: 6,837 pc vs. 8,574 pc
Focus-to-center
: 612 pcvs. 1,388 pcSemilatus rectum : 6,810 pc vs. 8,464 pc
Perigalacticon: 6,253 pc vs. 7,297 pc
Apogalacticon
: 7,477 pcvs. 10,074 pcSome Tabulated XHIP Data for Nekkar
(see also: SIMBAD)
Astrometry
2007A&A...474..653V
| Position | Proper Motion | |
| Right Ascension: | 225.48663804° ±0.11 mas | -40.16 ±0.12 mas/yr. |
| Declination: | 40.39063698° ±0.11 mas | -28.80 ±0.13 mas/yr. |
| Galactic Longitude: | 67.61908333° | -16.55 mas/yr. |
| Galactic Latitude: | 60.03861612° | 46.57 mas/yr. |
Parallax: 14.48 ± 0.14 mas
Spectrography
Spectral Type: G8IIIa Fe-0.5 1989ApJS...71..245K.
Radial Velocity: -18.40 ±0.16 km/s [A rating] 2008A&A...480...91S, 2006AstL...32..759G.
Iron Abundance [Fe/H]:
0.03 dex
2011A&A...525A..71W, 2008A&A...480...91S, 2007A&A...475.1003H, 1990ApJS...74.1075M.
Photometry
| band | magnitude | Abs. Mag. |
| U | ||
| B | 4.45 | 0.25 |
| V | 3.49 | -0.71 |
| R | ||
| I | 2.70 | -1.50 |
| J | 1.80 | -2.40 |
| H | 1.27 | -2.93 |
| K | 1.22 | -2.97 |
B-V: +0.96 V-I: +0.79
Derivations
Heliocentric distance: 69.05 pc (1.0% margin of error)
Galactocentric distance: 7,387 pc
Transverse velocity: 16.2 km/s
3D heliocentric position and motion:
|
toward: |
Galactic center | Galactic rotation | North Galactic Pole |
| Position ( X, Y, Z) | 13.1 pc | 31.9 pc | 59.8 pc |
| Velocity (U, V, W) | -3.5 km/s | -22.8 km/s | -8.3 km/s |