| |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Leo |
| Right ascension | 09h58m 13.37557s[1] |
| Declination | +12° 26′ 41.2865″[1] |
| Apparent magnitude (V) | 5.15[2] |
| Characteristics | |
| Spectral type | B6 IV[3] |
| U−B color index | −0.13[2] |
| B−V color 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° |
| Periastron epoch (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 as Nu Leonis, is a binary star system in the zodiac constellationofLeo. It is faintly visible to the naked eye with an apparent visual magnitude of 5.15;[2] parallax measurements[1] indicate it is around 500 light years away. At this distance, the visual extinction from interstellar 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-lined spectroscopic binary system with an orbital period of 137.3 days and an eccentricity of 0.7.[6] The primary component is a B-type subgiant star with a stellar classification of B6 IV.[3] It has about 3.37 times the mass of the Sun,[7] 2.3 times the Sun's radius,[8] and radiates 244[7] times the luminosity of the Sun from an outer atmosphere with an effective temperature of 9,552 K.[9] The rotation rate is moderate with a projected rotational velocity of 100 km/s.[7] Little is known about the companion.[6]
{{cite web}}: CS1 maint: postscript (link)
|
| |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| |||||||||||||
| Stars |
| ||||||||||||
| |||||||||||||
| Galaxies |
| ||||||||||||
