| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Coma Berenices |
| Right ascension | 12h 58m 55.44277s[1] |
| Declination | +17° 24′ 33.9898″[1] |
| Apparent magnitude (V) | 4.76[2] |
| Characteristics | |
| Evolutionary stage | asymptotic giant branch |
| Spectral type | M0.5 III[3] |
| B−Vcolor index | 1.556[4] |
| Astrometry | |
| Radial velocity (Rv) | −1.49±0.27[4] km/s |
| Proper motion (μ) | RA: −37.488[1]mas/yr Dec.: +33.982[1]mas/yr |
| Parallax (π) | 9.3472±0.2157 mas[1] |
| Distance | 349 ± 8 ly (107 ± 2 pc) |
| Absolute magnitude (MV) | −0.22[2] |
| Details[4] | |
| Radius | 43 R☉ |
| Luminosity | 372 L☉ |
| Surface gravity (log g) | 1.0 cgs |
| Temperature | 3,890±20 K |
| Rotational velocity (v sin i) | 5.8 km/s |
| Other designations | |
| 36 Com,BD+18°2682,FK5 3036,HD 112769,HIP 63355,HR 4920,SAO 100357[5] | |
| Database references | |
| SIMBAD | data |
36 Comae Berenices is a single[6]star in the northernconstellation ofComa Berenices. It is faintly visible to the naked eye with anapparent visual magnitude of 4.76.[2] The distance to this star, as determined from an annualparallax shift of9.3 mas,[1] is 349 light years. It is moving closer to the Earth with a heliocentricradial velocity of −1.5 km/s.[4]
This is anevolvedred giant star with astellar classification of M0.5 III,[3] currently on theasymptotic giant branch of theHertzsprung–Russell diagram.[7] This indicates it has consumed the hydrogen at its center and is now generating energy throughhydrogen andhelium fusion along shells surrounding an inert carbon and oxygencore. It has expanded to 43 times theradius of the Sun and is radiating 372 times theSun's luminosity from itsphotosphere at aneffective temperature of 3,890 K.[4]
