Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Gemini |
Right ascension | 06h 28m 57.78613s[1] |
Declination | +20° 12′ 43.6856″[1] |
Apparent magnitude (V) | 4.16[2] |
Characteristics | |
Spectral type | B6 III + B8 III[3] |
U−B color index | −0.47[2] |
B−V color index | −0.13[2] |
Astrometry | |
Radial velocity (Rv) | +39.4[4] km/s |
Proper motion (μ) | RA: −6.82[1] mas/yr Dec.: −13.10[1] mas/yr |
Parallax (π) | 5.99 ± 0.28 mas[1] |
Distance | 540 ± 30 ly (167 ± 8 pc) |
Absolute magnitude (MV) | −2.2 + −1.2[3] |
Orbit[5] | |
Primary | ν Gem Aa |
Companion | ν Gem Ab |
Period (P) | 53.7722 ± 0.0008 d |
Semi-major axis (a) | 2.82 ± 0.02 mas |
Eccentricity (e) | 0.056 ± 0.003 |
Inclination (i) | 0.98 ± 0.03° |
Longitude of the node (Ω) | 78.9 ± 0.2° |
Periastron epoch (T) | MJD 51011.8 ± 0.1 |
Argument of periastron (ω) (secondary) | 6.7 ± 2.0° |
Semi-amplitude (K1) (primary) | 51.6 ± 0.6 km/s |
Semi-amplitude (K2) (secondary) | 52.5 ± 1.1 km/s |
Orbit[5] | |
Primary | ν Gem A |
Companion | ν Gem B |
Period (P) | 6977.3 ± 6.1 |
Semi-major axis (a) | 82.8 ± 1.3 mas |
Eccentricity (e) | 0.241 ± 0.002 |
Inclination (i) | 75.9 ± 0.2° |
Longitude of the node (Ω) | 121.0 ± 0.1° |
Periastron epoch (T) | MJD 48810.3 ± 13.0 |
Argument of periastron (ω) (secondary) | 226.9 ± 0.4° |
Semi-amplitude (K1) (primary) | 8.0 ± 0.1 km/s |
Semi-amplitude (K2) (secondary) | 15.9 ± 0.1 km/s |
Details | |
ν Gem Aa | |
Mass | 3.34[5] M☉ |
Luminosity | 1,380[6] L☉ |
Temperature | 14,100[6] K |
Rotational velocity (v sin i) | 160[7] km/s |
ν Gem Ab | |
Mass | 3.28[5] M☉ |
ν Gem B | |
Mass | 3.33[5] M☉ |
Other designations | |
Database references | |
SIMBAD | data |
Nu Geminorum, Latinized from ν Geminorum, is a triple[5] star system in the constellation Gemini. It has an apparent visual magnitude of 4.16,[2] 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,[1] it is located at a distance of roughly 540 light years from the Sun. The position of this system near the ecliptic means it is subject to lunar occultations.[9]
The inner components of this multiple star system have an orbital period of about 54 days and a nearly circular orbit with an eccentricity of 0.056.[5] There is some uncertainty in the spectral type, with classifications ranging from a main sequence star to a giant. Orbiting the inner pair is a classical Be star, with an orbital period of 19.1 years and an eccentricity of 0.24.[5] The two orbits are co-directional and roughly coplanar. The system is overall dynamically stable, and shows no signs of Kozai-Lidov cycles. The outer Be star appears to be single.[5]
According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, this star was titled as Nucatai.[10]