89 Aquarii, a yellow giant star in Aquarius
89 Aquarii is a yellow giant star in the constellation Aquarius. At 556 light years away, it shines at an apparent visual magnitude of 4.80.
89 Aquarii (HIP 114375)
89 Aquarii is a yellow giant star in the constellation Aquarius. At 556 light years away, it shines at an apparent visual magnitude of 4.80. It is moving through the Galaxy at a speed of 30.4 km/s relative to the Sun.
Sky position: RA 23h 9.9m, Dec -22° 27.5'
Common designations: 89 Aquarii, HR 8817, HD 218640, HD 218641, GJ 9812, Gaia DR3 2385897355615864192, HIP 114375
89 Aquarii has the spectral type G2III+A2V. G-type stars are yellow stars of about 5,300 to 6,000 K, the same class as the Sun. Their spectra show strong lines of ionized calcium and many metals. Its luminosity class III marks it as a giant: an evolved star that has left the main sequence and swollen to many times its original size.
How to find 89 Aquarii in the sky
89 Aquarii lies in Aquarius. With a declination of -22° 27.5', it is visible from the entire Southern Hemisphere and from the Northern Hemisphere up to about latitude 68° N. It is bright enough to see with the naked eye under dark skies. It is highest in the sky at local midnight around October, which makes the weeks around that month the best time to observe it.
Tabulated data for 89 Aquarii
Astrometry and spectroscopy
| Right Ascension (J2000) | 347.47870627° (23h 9.9m) |
| Declination (J2000) | -22.45760691° (-22° 27.5') |
| Galactic Longitude | 38.80589577° |
| Galactic Latitude | -66.53327483° |
| Proper motion RA | 35.56 mas/yr |
| Proper motion Dec | -11.65 mas/yr |
| Parallax | 5.87 ± 1.12 mas |
| Spectral Type | G2III+A2V |
| Radial Velocity | -3.48 km/s |
Photometry
| Band | Magnitude | Abs. Mag. |
|---|---|---|
| B | 5.50 | -0.66 |
| V | 4.80 | -1.36 |
| J | 3.45 | -2.70 |
| H | 3.00 | -3.16 |
| K | 2.95 | -3.20 |
Colour index B-V: +0.70
Derivations
- Heliocentric distance: 170.36 pc (556 light years) (19.1% margin of error)
- Absolute visual magnitude: -1.36
- Transverse velocity: 30.2 km/s
- Space velocity relative to the Sun: 30.4 km/s
- Galactic position (X, Y, Z): 52.9 pc, 42.5 pc, -156.3 pc
- Galactic velocity (U, V, W): -22.2 km/s, -18.8 km/s, -8.8 km/s
Data: Extended Hipparcos Compilation (XHIP) and SIMBAD.