Lambda Piscis Austrini, a blue-white main-sequence star in Piscis Austrinus
Lambda Piscis Austrini is a blue-white main-sequence star in the constellation Piscis Austrinus. At 532 light years away, it shines at an apparent visual magnitude of 5.43.
Lambda Piscis Austrini (HIP 109789)
Lambda Piscis Austrini is a blue-white main-sequence star in the constellation Piscis Austrinus. At 532 light years away, it shines at an apparent visual magnitude of 5.43. It is moving through the Galaxy at a speed of 19.0 km/s relative to the Sun.
Sky position: RA 22h 14.3m, Dec -27° 46.0'
Common designations: Lambda Piscis Austrini, 16 Piscis Austrini, HR 8478, HD 210934, Gaia DR3 6618669608159645312, HIP 109789
Lambda Piscis Austrini has the spectral type B7V. B-type stars are hot (about 10,000 to 30,000 K), luminous and blue-white. They are massive, short-lived stars, typically only tens of millions of years old, and are common in young clusters and OB associations. Its luminosity class V means it is a main-sequence (dwarf) star, still fusing hydrogen into helium in its core like the Sun.
How to find Lambda Piscis Austrini in the sky
Lambda Piscis Austrini lies in Piscis Austrinus. With a declination of -27° 46.0', it is visible from the entire Southern Hemisphere and from the Northern Hemisphere up to about latitude 62° N. It is bright enough to see with the naked eye under dark skies. It is highest in the sky at local midnight around September, which makes the weeks around that month the best time to observe it.
Tabulated data for Lambda Piscis Austrini
Astrometry and spectroscopy
| Right Ascension (J2000) | 333.57813031° (22h 14.3m) |
| Declination (J2000) | -27.76690635° (-27° 46.0') |
| Galactic Longitude | 22.58207901° |
| Galactic Latitude | -55.28530461° |
| Proper motion RA | 23.07 mas/yr |
| Proper motion Dec | 1.77 mas/yr |
| Parallax | 6.13 ± 0.12 mas |
| Spectral Type | B7V |
| Radial Velocity | 6.45 km/s |
Photometry
| Band | Magnitude | Abs. Mag. |
|---|---|---|
| B | 5.27 | -0.79 |
| V | 5.43 | -0.63 |
| J | 5.60 | -0.47 |
| H | 5.68 | -0.38 |
| K | 5.68 | -0.38 |
Colour index B-V: -0.16
Derivations
- Heliocentric distance: 163.13 pc (532 light years) (1.9% margin of error)
- Absolute visual magnitude: -0.63
- Transverse velocity: 17.9 km/s
- Space velocity relative to the Sun: 19.0 km/s
- Galactic position (X, Y, Z): 85.8 pc, 35.7 pc, -134.1 pc
- Galactic velocity (U, V, W): -11.4 km/s, -0.5 km/s, -15.2 km/s
Data: Extended Hipparcos Compilation (XHIP) and SIMBAD.