-
Messier 35, with 6 Gem visible right at the bottom edge of the image
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Gemini |
Right ascension | 06h 12m 19.09884s[1] |
Declination | +22° 54′ 30.6531″[1] |
Apparent magnitude (V) | 5.74 – 8.10[2] |
Characteristics | |
Spectral type | M1-2 Ia-Iab[3] |
U−B color index | +1.93[4] |
B−V color index | +1.63[4] |
Variable type | LC[2] |
Astrometry | |
Radial velocity (Rv) | +27.16±0.42[5] km/s |
Proper motion (μ) | RA: +0.144[1] mas/yr Dec.: −2.085[1] mas/yr |
Parallax (π) | 0.5642 ± 0.0957 mas[1] |
Distance | approx. 5,800 ly (approx. 1,800 pc) |
Absolute magnitude (MV) | −6.32[6] |
Details | |
Mass | ~20[7] M☉ |
Radius | 821+60 −27[8] R☉ |
Luminosity | 86,000[9] L☉ |
Surface gravity (log g) | 0.0[6] cgs |
Temperature | 3,789[10] K |
Other designations | |
Database references | |
SIMBAD | data |
6 Geminorum is a variable star in the zodiac constellation of Gemini, located roughly 5,800 light years away from the Sun. It has the variable star designation BU Geminorum; 6 Geminorum is the Flamsteed designation. At its brightest this reddish hued star is barely visible to the naked eye but is readily visible with binoculars, found southeast of M 35, just to the south of WY Geminorum. It is moving further from the Earth with a heliocentric radial velocity of +27 km/s.[5] The star is a member of the Gemini OB1 association.[12]
This is an evolved red supergiant with a stellar classification of M1-2 Ia-Iab.[3] It is a semiregular variable star, ranging from visual magnitude +5.7 down to +7.5 over a period of 325 days. It has been given the sub-classification of Lc, which means "Irregular variable supergiants of late spectral types having amplitudes of about 1 mag. in V.O".[13] The star has expanded to 821[8] times the Sun's radius and is radiating 86,000[9] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 3,789 K.[10]
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