38 Geminorum
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Gemini |
| Right ascension | 06h 54m 38.63478s |
| Declination | +13° 10′ 40.2207″ |
| Apparent magnitude (V) | 4.75 + 7.80 + 15.1 |
| Characteristics | |
| A | |
| Evolutionary stage | main sequence |
| Spectral type | A8V |
| U−B color index | +0.07 |
| B−V color index | +0.30 |
| Variable type | Suspected δ Sct |
| B | |
| Evolutionary stage | main sequence |
| Spectral type | G6V |
| UPM J0654+1310 | |
| Evolutionary stage | main sequence |
| Spectral type | dMp3.5 |
| Astrometry | |
| A | |
| Radial velocity (Rv) | +24±5 km/s |
| Proper motion (μ) | RA: +68.745 mas/yr Dec.: −86.832 mas/yr |
| Parallax (π) | 33.9184±0.8248 mas |
| Distance | 96 ± 2 ly (29.5 ± 0.7 pc) |
| Absolute magnitude (MV) | +2.50 |
| B | |
| Radial velocity (Rv) | +22.6±2 km/s |
| Proper motion (μ) | RA: +89.235 mas/yr Dec.: −77.171 mas/yr |
| Parallax (π) | 33.3308±0.0847 mas |
| Distance | 97.9 ± 0.2 ly (30.00 ± 0.08 pc) |
| UPM J0654+1310 | |
| Radial velocity (Rv) | +25.59±3.25 km/s |
| Proper motion (μ) | RA: +71.706 mas/yr Dec.: −85.515 mas/yr |
| Parallax (π) | 33.2912±0.0248 mas |
| Distance | 97.97 ± 0.07 ly (30.04 ± 0.02 pc) |
| Details | |
| 38 Gem Aa | |
| Mass | 1.61 M☉ |
| Radius | 1.97 R☉ |
| Surface gravity (log g) | 4.23 cgs |
| Temperature | 7,150 K |
| Metallicity [Fe/H] | −0.08±0.06 dex |
| Rotational velocity (v sin i) | 147.5±10.5 km/s |
| Age | 1.3 Gyr |
| 38 Gem Ab | |
| Mass | 1.17 M☉ |
| Radius | 1.16 R☉ |
| Temperature | 6,300 K |
| Age | 1.3 Gyr |
| 38 Gem B | |
| Mass | 0.89 M☉ |
| Radius | 0.89 R☉ |
| Luminosity | 0.694 L☉ |
| Temperature | 5,583 K |
| Age | 1.3 Gyr |
| UPM J0654+1310 | |
| Mass | 0.25 M☉ |
| Radius | 0.29 R☉ |
| Luminosity | 0.0064 L☉ |
| Surface gravity (log g) | 4.46 cgs |
| Temperature | 3,000 K |
| Age | 1.3 Gyr |
| Other designations | |
| e Gem, 38 Gem, NSV 3266, BD+13°1462, GJ 9220, HD 50635, HIP 33202, HR 2564, SAO 96265, WDS J06546+1311 | |
| Database references | |
| SIMBAD | data |
| B | |
| UPM J0654+1310 | |
38 Geminorum is a quadruple star system in the northern zodiac constellation of Gemini. It has the Bayer designation e Geminorum, while 38 Geminorum is the Flamsteed designation. This system is visible to the naked eye as a faint, white-hued point of light with an apparent visual magnitude of 4.71. The system is located about 98 light years away from the Sun based on parallax, and is drifting further away with a radial velocity of +16 km/s. It is a potential member of the Tucana–Horologium stellar kinematic group.