77 Aquarii, an orange giant star in Aquarius
77 Aquarii is an orange giant star in the constellation Aquarius. At 134 light years away, it shines at an apparent visual magnitude of 5.53.
77 Aquarii (HIP 113148)
77 Aquarii is an orange giant star in the constellation Aquarius. At 134 light years away, it shines at an apparent visual magnitude of 5.53. The iron abundance of 77 Aquarii is +0.15 (141.3% of the Sun). It is moving through the Galaxy at a speed of 58.9 km/s relative to the Sun. Its projected Galactic orbit carries it between 20,600 and 32,700 light years from the center of the Galaxy. It will come closest to the Sun 421,000 years from now when it will brighten to magnitude 5.01 from a distance of 106 light years.
Sky position: RA 22h 54.8m, Dec -16° 16.2'
Common designations: 77 Aquarii, HIP 113148, HD 216640, HR 8711
Galactic Orbit of
77 Aquarii
(compared to the
Sun)
E
ccentricity: 22.8% vs. 16.0%Angle φ : 77.5°vs. 26.0°
Semi-major axis : 8,176 pc vs. 8,686 pc
Semi-minor axis: 7,961 pc vs. 8,574 pc
Focus-to-center
: 1,863 pcvs. 1,388 pcSemilatus rectum : 7,752 pc vs. 8,464 pc
Perigalacticon: 6,313 pc vs. 7,297 pc
Apogalacticon
: 10,040 pcvs. 10,074 pcSome Tabulated XHIP Data for 77 Aquarii
(see also: SIMBAD)
Astrometry
2007A&A...474..653V
| Position | Proper Motion | |
| Right Ascension: | 343.69001971° ±0.48 mas | -220.78 ±0.58 mas/yr. |
| Declination: | -16.27174198° ±0.39 mas | -87.70 ±0.42 mas/yr. |
| Galactic Longitude: | 48.78238836° | -178.08 mas/yr. |
| Galactic Latitude: | -60.89814506° | 157.24 mas/yr. |
Parallax: 24.28 ± 0.56 mas
Spectrography
Spectral Type: K2.5III 1989ApJS...71..245K.
Radial Velocity: -36.30 ±2.90 km/s [A rating] 2006AstL...32..759G.
Iron Abundance [Fe/H]:
0.15 dex
2011A&A...525A..71W, 1990ApJS...74.1075M.
Photometry
| band | magnitude | Abs. Mag. |
| U | ||
| B | 6.64 | 3.57 |
| V | 5.53 | 2.46 |
| R | ||
| I | 4.59 | 1.52 |
| J | 3.92 | 0.85 |
| H | 3.27 | 0.20 |
| K | 3.18 | 0.10 |
B-V: +1.11 V-I: +0.94
Derivations
Heliocentric distance: 41.16 pc (2.3% margin of error)
Galactocentric distance: 7,387 pc
Transverse velocity: 46.4 km/s
3D heliocentric position and motion:
|
toward: |
Galactic center | Galactic rotation | North Galactic Pole |
| Position ( X, Y, Z) | 13.2 pc | 15.1 pc | -36.0 pc |
| Velocity (U, V, W) | 32.2 km/s | -16.0 km/s | 46.6 km/s |