15 Aquarii, a blue bright giant star in Aquarius
15 Aquarii is a blue bright giant star in the constellation Aquarius. At 1,006 light years away, it shines at an apparent visual magnitude of 5.83.
15 Aquarii (HIP 105164)
15 Aquarii is a blue bright giant star in the constellation Aquarius. At 1,006 light years away, it shines at an apparent visual magnitude of 5.83. It is moving through the Galaxy at a speed of 27.4 km/s relative to the Sun. Its projected Galactic orbit carries it between 23,200 and 36,900 light years from the center of the Galaxy.
Sky position: RA 21h 18.2m, Dec -4° 31.2'
Common designations: 15 Aquarii, HIP 105164, HD 202753, HR 8141
Galactic Orbit of
15 Aquarii
(compared to the
Sun)
E
ccentricity: 22.8% vs. 16.0%Angle φ : -23.8°vs. 26.0°
Semi-major axis : 9,224 pc vs. 8,686 pc
Semi-minor axis: 8,980 pc vs. 8,574 pc
Focus-to-center
: 2,107 pcvs. 1,388 pcSemilatus rectum : 8,742 pc vs. 8,464 pc
Perigalacticon: 7,117 pc vs. 7,297 pc
Apogalacticon
: 11,330 pcvs. 10,074 pcSome Tabulated XHIP Data for 15 Aquarii
(see also: SIMBAD)
Astrometry
2007A&A...474..653V
| Position | Proper Motion | |
| Right Ascension: | 319.54610834° ±0.22 mas | 12.05 ±0.29 mas/yr. |
| Declination: | -4.51951133° ±0.18 mas | 12.99 ±0.20 mas/yr. |
| Galactic Longitude: | 47.07535187° | 17.28 mas/yr. |
| Galactic Latitude: | -34.47108485° | -3.92 mas/yr. |
Parallax: 3.21 ± 0.28 mas
Spectrography
Spectral Type: B7 II/III 1999MSS...C05....0H.
Radial Velocity: -9.00 ±1.00 km/s [A rating] 2006AstL...32..759G.
Iron Abundance [Fe/H]:
n/a
Photometry
band
magnitude
Abs. Mag.
U
B
5.70
-1.75
V
5.83
-1.62
R
I
5.92
-1.53
J
6.04
-1.41
H
6.17
-1.28
K
6.14
-1.31
B-V: -0.13 V-I: -0.09
Derivations
Heliocentric distance: 308.71 pc (8.7% margin of error)
Galactocentric distance: 7,231 pc
Transverse velocity: 25.9 km/s
3D heliocentric position and motion:
|
toward: |
Galactic center | Galactic rotation | North Galactic Pole |
| Position ( X, Y, Z) | 173.3 pc | 186.4 pc | -174.7 pc |
| Velocity (U, V, W) | -25.8 km/s | 9.4 km/s | 0.4 km/s |