| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hercules |
| Right ascension | 17h 30m 44.3098s[1] |
| Declination | +26° 06′ 38.324″[1] |
| Apparent magnitude (V) | 4.41[2] |
| Characteristics | |
| Spectral type | K3.5III[3] |
| U−B color index | +1.68[4] |
| B−V color index | +1.44[4] |
| Astrometry | |
| Radial velocity (Rv) | −26.51[5] km/s |
| Proper motion (μ) | RA: +18.782[1] mas/yr Dec.: +16.184[1] mas/yr |
| Parallax (π) | 8.2943 ± 0.0921 mas[1] |
| Distance | 393 ± 4 ly (121 ± 1 pc) |
| Absolute magnitude (MV) | −0.86[6] |
| Details | |
| Mass | 1.18[7] M☉ |
| Radius | 40[8] R☉ |
| Luminosity | 400[8] L☉ |
| Surface gravity (log g) | 1.30[7] cgs |
| Temperature | 4,063 - 4,079[8] K |
| Metallicity [Fe/H] | 0.023[7] dex |
| Rotational velocity (v sin i) | <1.5[9] km/s |
| Age | 3.98 or 7.23[8] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Lambda Herculis (λ Herculis. abbreviated Lambda Her, λ Her), formally named Maasym /ˈmeɪəsɪm/,[11] is a star in the constellation of Hercules. From parallax measurements taken during the Gaia mission, it is approximately 393 light-years from the Sun.
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