Graffias, a blue main-sequence star in Scorpius
Graffias is a blue main-sequence star in the constellation Scorpius. At 399 light years away, it is the 98th brightest star in the Earth's sky, where it shines at an apparent visual magnitude of 2.56.
Graffias (HIP 78820)
Graffias is a blue main-sequence star in the constellation Scorpius. At 399 light years away, it is the 98th brightest star in the Earth's sky, where it shines at an apparent visual magnitude of 2.56. Graffias is a multiple-star system. It is moving through the Galaxy at a speed of 14.3 km/s relative to the Sun. Its projected Galactic orbit carries it between 22,300 and 25,700 light years from the center of the Galaxy.
Sky position: RA 16h 5.4m, Dec -19° 48.6'
Common designations: Graffias, Beta-1 Scorpii, 8 Scorpii, HIP 78820, HD 144217, HR 5984
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Brightest stars in Scorpius:
(list all)
| Rank | Mag. | Star |
| 1 | 1.06 | Antares |
| 2 | 1.62 | Shaula |
| 3 | 1.86 | Sargas |
| 4 | 2.29 | Dschubba |
| 5 | 2.29 | Epsilon Scorpii |
| 6 | 2.39 | Kappa Scorpii |
7
| 2.56
) Graffias
| Rank | Mag. | Star |
| 8 | 2.70 | Lesath |
| 9 | 2.82 | Alniyat |
| 10 | 2.89 | Pi Scorpii |
| 11 | 2.90 | Alniyat |
| 12 | 2.99 | Iota-1 Scorpii |
| 13 | 3.00 | Mu-1 Scorpii |
| 14 | 3.19 | G Scorpii |
| 15 | 3.32 | Eta Scorpii |
| 16 | 3.56 | Mu-2 Scorpii |
| 17 | 3.62 | Grafias |
Hover over other bright stars to identify or click to jump.
Galactic Orbit of Graffias
(compared to the Sun)
E
ccentricity: 7.0% vs. 16.0%Angle φ : 86.1°vs. 26.0°
Semi-major axis : 7,359 pc vs. 8,686 pc
Semi-minor axis: 7,341 pc vs. 8,574 pc
Focus-to-center
: 514 pcvs. 1,388 pcSemilatus rectum : 7,323 pc vs. 8,464 pc
Perigalacticon: 6,845 pc vs. 7,297 pc
Apogalacticon
: 7,873 pcvs. 10,074 pcSome Tabulated XHIP Data for Graffias
(see also: SIMBAD)
Astrometry
2007A&A...474..653V
| Position | Proper Motion | |
| Right Ascension: | 241.35931336° ±0.71 mas | -5.20 ±0.92 mas/yr. |
| Declination: | -19.80539435° ±0.48 mas | -24.04 ±0.64 mas/yr. |
| Galactic Longitude: | 353.19292076° | -21.05 mas/yr. |
| Galactic Latitude: | 23.59965716° | -12.71 mas/yr. |
Parallax: 8.07 ± 0.78 mas
Spectrography
Spectral Type: B1V 2009A&A...501..297Z.
Radial Velocity:
-1.00 ±2.00 km/s [D rating]
2006AstL...32..759G.
This star is a spectroscopic binary with an unsolved orbit.
Iron Abundance [Fe/H]:
n/a
Photometry
band
magnitude
Abs. Mag.
U
1.67
-3.77
B
2.50
-2.95
V
2.56
-2.88
R
I
2.65
-2.79
J
H
K
B-V: -0.06 V-I: -0.09
Derivations
Heliocentric distance: 122.54 pc (9.7% margin of error)
Galactocentric distance: 7,289 pc
Transverse velocity: 14.3 km/s
3D heliocentric position and motion:
|
toward: |
Galactic center | Galactic rotation | North Galactic Pole |
| Position ( X, Y, Z) | 111.5 pc | -13.3 pc | 49.1 pc |
| Velocity (U, V, W) | 0.6 km/s | -12.4 km/s | -7.2 km/s |