HD 136118
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Serpens |
| Right ascension | 15h 18m 55.47227s |
| Declination | −01° 35′ 32.5926″ |
| Apparent magnitude (V) | 6.93 |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | F7V |
| B−V color index | 0.553±0.007 |
| Astrometry | |
| Radial velocity (Rv) | −3.07±0.13 km/s |
| Proper motion (μ) | RA: −123.024(31) mas/yr Dec.: 22.180(30) mas/yr |
| Parallax (π) | 19.8116±0.0341 mas |
| Distance | 164.6 ± 0.3 ly (50.48 ± 0.09 pc) |
| Absolute magnitude (MV) | 3.60 |
| Details | |
| Mass | 1.84±0.23 M☉ |
| Radius | 1.70±0.02 R☉ |
| Luminosity | 3.717±0.018 L☉ |
| Surface gravity (log g) | 4.08 cgs |
| Temperature | 6,148+38 −43 K |
| Metallicity [Fe/H] | −0.06±0.01 dex |
| Rotational velocity (v sin i) | 8.5 km/s |
| Age | 3.5±0.4 Gyr |
| Other designations | |
| BD−01° 3045, HD 136118, HIP 74948, SAO 140452 | |
| Database references | |
| SIMBAD | data |
HD 136118 is a star in the Serpens Caput section of the Serpens constellation. The star is too dim to be readily visible to the naked eye, having an apparent visual magnitude of 6.93. It is located at a distance of 165 light years from the Sun based on parallax, and is drifting closer with a radial velocity of −3 km/s.
This object is an F-type main-sequence star with a stellar classification of F7V. The absolute visual magnitude of this star suggests that it has begun to evolve away from the main sequence. The abundances of the stellar atmosphere are similar to the Sun, and it has only a modest level of chromospheric activity. HD 136118 has 84% more mass compared to the Sun, and is 70% larger in radius. The star is an estimated 3.5 billion years old and is spinning with a projected rotational velocity of 8.5 km/s.