AK Leporis
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Lepus |
| Right ascension | 05h 44m 26.543s[1] |
| Declination | −22° 25′ 18.77″[1] |
| Apparent magnitude (V) | 6.141[2] |
| Characteristics | |
| Spectral type | K2V[3] |
| U−B color index | +0.74[4] |
| B−V color index | +0.96[4] |
| Variable type | BY Draconis[3] |
| Astrometry | |
| Radial velocity (Rv) | −9.57 ± 0.13[5] km/s |
| Proper motion (μ) | RA: −304.4[6] mas/yr Dec.: −352.2[6] mas/yr |
| Parallax (π) | 112.0[7] mas |
| Distance | 28 ly (9.0[8] pc) |
| Absolute magnitude (MV) | 6.31[2] |
| Details | |
| Surface gravity (log g) | 4.66 ± 0.01[9] cgs |
| Temperature | 4,869 ± 61[9] K |
| Metallicity [Fe/H] | 0.01 ± 0.06[9] dex |
| Rotational velocity (v sin i) | 2.8 ± 1.8[5] km/s |
| Age | 0.9[8] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
AK Leporis is a star in the southern constellation of Lepus the hare. It has an apparent visual magnitude of 6.141,[2] so, according to the Bortle scale, it is faintly visible from rural skies at night. This star forms a visual double with Gamma Leporis—the two have an angular separation of 97″, making them difficult to separate with the naked eye even under the best conditions.[11] Both Gamma Leporis and AK Leporis are members of the Ursa Major Moving Group of stars that share a common motion through space.[5]
This is a BY Draconis variable star that undergoes brightness variations due to stellar activity. Differential rotation causes changes to the periodicity of the variation depending on the latitude of the activity.[3] X-ray emission has been detected from AK Leporis, and it is located at or near a radio source.[7]
Infrared observation of this star shows a large excess at a wavelength of 24 µm. This may be explained by the proximity of Gamma Leporis to the line of sight, or there may be a red dwarf companion. There is no excess observed at 70 µm.[8]
References
- ↑ 1.0 1.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 2.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 3.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 4.0 4.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 5.0 5.1 5.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 6.0 6.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 7.0 7.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 8.0 8.1 8.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 9.0 9.1 9.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
