HR 1771, a yellow giant star in Lepus
HR 1771 is a yellow giant star in the constellation Lepus. At 352 light years away, it shines at an apparent visual magnitude of 5.06.
HR 1771 (HIP 25045)
HR 1771 is a yellow giant star in the constellation Lepus. At 352 light years away, it shines at an apparent visual magnitude of 5.06. It is moving through the Galaxy at a speed of 13.4 km/s relative to the Sun.
Sky position: RA 5h 21.8m, Dec -24° 46.4'
Common designations: HR 1771, HIP 25045
HR 1771 has the spectral type G8/K0II/III+A2/3. 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 HR 1771 in the sky
HR 1771 lies in Lepus. With a declination of -24° 46.4', it is visible from the entire Southern Hemisphere and from the Northern Hemisphere up to about latitude 65° N. It is bright enough to see with the naked eye under dark skies. It is highest in the sky at local midnight around January, which makes the weeks around that month the best time to observe it.
Tabulated data for HR 1771
Astrometry and spectroscopy
| Right Ascension (J2000) | 80.44272716° (5h 21.8m) |
| Declination (J2000) | -24.77298379° (-24° 46.4') |
| Galactic Longitude | 227.30188645° |
| Galactic Latitude | -29.94871384° |
| Proper motion RA | -20.42 mas/yr |
| Proper motion Dec | -13.99 mas/yr |
| Parallax | 9.27 ± 0.53 mas |
| Spectral Type | G8/K0II/III+A2/3 |
| Radial Velocity | 4.50 km/s |
Photometry
| Band | Magnitude | Abs. Mag. |
|---|---|---|
| B | 5.73 | 0.57 |
| V | 5.06 | -0.10 |
| J | 3.77 | -1.39 |
| H | 3.26 | -1.90 |
| K | 3.20 | -1.96 |
Colour index B-V: +0.67
Derivations
- Heliocentric distance: 107.87 pc (352 light years) (5.7% margin of error)
- Absolute visual magnitude: -0.10
- Transverse velocity: 12.7 km/s
- Space velocity relative to the Sun: 13.4 km/s
- Galactic position (X, Y, Z): -63.4 pc, -68.7 pc, -53.9 pc
- Galactic velocity (U, V, W): 4.1 km/s, -0.8 km/s, -12.8 km/s
Data: Extended Hipparcos Compilation (XHIP) and SIMBAD.