  | |
| Observation data EpochJ2000.0 EquinoxJ2000.0 (ICRS) | |
|---|---|
| Constellation | Leo |
| Right ascension | 09h 58m 13.37557s[1] |
| Declination | +12° 26′ 41.2865″[1] |
| Apparent magnitude (V) | 5.15[2] |
| Characteristics | |
| Spectral type | B6 IV[3] |
| U−Bcolor index | −0.13[2] |
| B−Vcolor index | −0.04[2] |
| Astrometry | |
| Radial velocity (Rv) | +14.4[4] km/s |
| Proper motion (μ) | RA: −25.66[1]mas/yr Dec.: −15.56[1]mas/yr |
| Parallax (π) | 6.53±0.24 mas[1] |
| Distance | 500 ± 20 ly (153 ± 6 pc) |
| Absolute magnitude (MV) | −0.66[5] |
| Orbit[6] | |
| Period (P) | 137.2978 d |
| Eccentricity (e) | 0.7 |
| Longitude of the node (Ω) | 293.7° |
| Periastronepoch (T) | 2419815.9 JD |
| Semi-amplitude (K1) (primary) | 20 km/s |
| Details | |
| Mass | 3.37±0.05[7] M☉ |
| Radius | 2.3[8] R☉ |
| Luminosity | 244[7] L☉ |
| Temperature | 9,552[9] K |
| Rotational velocity (v sin i) | 100[7] km/s |
| Other designations | |
| ν Leo,27 Leo,BD+13°2183,HD 86360,HIP 48883,HR 3937,SAO 98876[10] | |
| Database references | |
| SIMBAD | data |
ν Leonis, Latinised asNu Leonis, is abinary star system in thezodiacconstellation ofLeo. It is faintly visible to the naked eye with anapparent visual magnitude of 5.15;[2]parallax measurements[1] indicate it is around 500 light years away. At this distance, the visualextinction frominterstellar dust is 0.33 magnitudes.[11]
It is 0.05 degree north of the ecliptic, so it can be occulted by the moon or planets.
This is a single-linedspectroscopic binary system with anorbital period of 137.3 days and aneccentricity of 0.7.[6] The primary component is aB-typesubgiant star with astellar classification of B6 IV.[3] It has about 3.37 times themass of the Sun,[7] 2.3 times theSun's radius,[8] and radiates 244[7] times theluminosity of the Sun from anouter atmosphere with aneffective temperature of 9,552 K.[9] The rotation rate is moderate with aprojected rotational velocity of 100 km/s.[7] Little is known about the companion.[6]
{{cite web}}: CS1 maint: postscript (link)