| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Gemini |
| Right ascension | 06h55m 18.66671s[1] |
| Declination | +25° 22′ 32.5038″[1] |
| Apparent magnitude (V) | 5.74[2] |
| Characteristics | |
| Spectral type | G0 V[3] |
| U−B color index | +0.01[4] |
| B−V color index | 0.573±0.010 |
| Astrometry | |
| Radial velocity (Rv) | −14.94±0.15[5] km/s |
| Proper motion (μ) | RA: −37.882[1] mas/yr Dec.: +24.211[1] mas/yr |
| Parallax (π) | 57.2425 ± 0.1005 mas[1] |
| Distance | 57.0 ± 0.1 ly (17.47 ± 0.03 pc) |
| Absolute magnitude (MV) | 4.56[2] |
| Details | |
| Mass | 1.146[5] M☉ |
| Radius | 1.04+0.04 −0.08[1] R☉ |
| Luminosity | 1.310+0.003 −0.004[1] L☉ |
| Surface gravity (log g) | 4.29[3] cgs |
| Temperature | 6060+235 −118[1] K |
| Metallicity [Fe/H] | −0.25[6] dex |
| Rotation | 25.0 d[7] |
| Rotational velocity (v sin i) | 1.89[8] km/s |
| Age | 5.49[9] Gyr |
| Other designations | |
BD+25°1496, GJ 252, HD 50692, HIP 33277, HR 2569, SAO 78866[10] | |
| Database references | |
| SIMBAD | data |
37 Geminorum is a solitary[11] Sun-like star located at the northwest part of the northern constellationofGemini, about three degrees to the east of the bright star Epsilon Geminorum.[12] The apparent visual magnitude of 37 Geminorum is 5.74,[2] which is just bright enough to be visible to the naked eye on a dark night. It is located at a distance of 57 light years from the Sun based on parallax.[1] This star is drifting closer with a radial velocity of −15 km/s, and is predicted to come as near as 13.8 light-years in approximately a million years.[5] It is positioned close enough to the ecliptic to be subject to lunar occultations, such as happened on April 8, 1984.[13]
The stellar classification of 37 Geminorum is G0 V,[3] which indicates it is an ordinary G-type main sequence star that is generating energy through core hydrogen fusion. In 2007, J. C. Hall and associates categorized it as a solar-type with a high mean activity level.[14] The star is around 5.5[9] billion years old and is spinning with a rotation period of 25 days.[7] It is slightly larger and more massive than the Sun,[5][1] with a lower abundance of heavier elements based on its abundance of iron.[6] 37 Geminorum is radiating 1.3 times the luminosity of the Sun from its photosphere at an effective temperature of 6,060 K.[1]
As of 2012, no extrasolar planetsordebris disks have yet been discovered around it.[15] The center of the star's habitable zone lies at a distance of 1.32 AU.[16]
There was a METI message sent to 37 Geminorum. It was transmitted from Eurasia's largest radar, 70-meter Yevpatoria Planetary Radar. The message was named the Teen Age Message, it was sent on September 3, 2001, and it will arrive at 37 Geminorum in December 2057.[17]
The Catalog of Nearby Habitable Systems (HabCat) is a list of approximately 17,000 relatively close stars similar to the sun and considered able to support a planet habitable by humans. 37 Geminorum is on the HabCat list.[18]
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