Nu Geminorum
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) |
|
|---|---|
| Constellation | Gemini |
| Right ascension | 06h 28m 57.78613s |
| Declination | +20° 12′ 43.6856″ |
| Apparent magnitude (V) | 4.16 |
| Characteristics | |
| Spectral type | B6 III + B8 III |
| U−B color index | −0.47 |
| B−V color index | −0.13 |
| Astrometry | |
| Radial velocity (Rv) | +39.4 km/s |
| Proper motion (μ) |
RA: −6.82 mas/yr Dec.: −13.10 mas/yr |
| Parallax (π) | 5.99 ± 0.28mas |
| Distance | 540 ± 30 ly (167 ± 8 pc) |
| Absolute magnitude (MV) | −2.2 + −1.2 |
| Orbit | |
| Period (P) | 18.75±0.34 yr |
| Semi-major axis (a) | 0.081±0.008" |
| Eccentricity (e) | 0.297±0.049 |
| Inclination (i) | 72.9±1.4° |
| Longitude of the node (Ω) | 120.9±1.1° |
| Periastron epoch (T) | 1992.57±0.18 |
|
Argument of periastron (ω) (secondary) |
228.4±7.6° |
| Details | |
| ν Gem Aa | |
| Mass | 6.4 M☉ |
| Luminosity | 1,380 L☉ |
| Temperature | 14,100 K |
| Rotational velocity (v sin i) | 160 km/s |
| ν Gem Ab | |
| Mass | 4.6 M☉ |
| Other designations | |
Nu Geminorum (ν Gem) is a binary, and possibly a multiplestar system in the constellation Gemini. It has an apparent visual magnitude of 4.16, which is bright enough to be visible to the naked eye on a dark night. Based upon an annual parallax shift of 5.99 mas, it is located at a distance of roughly 540 light years from the Sun.
The main components of this potentially multiple star system have an orbital period of 18.75 years and an eccentricity of 0.297. There is much uncertainty in the spectral type, with classifications ranging from a main sequence star to a giant. The spectra indicate the presence of a Be star in the system.
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