S Boötis is a Mira variable in the constellation Boötes. It ranges between magnitudes 7.8 and 13.8 over a period of approximately 270 days.[3] It is too faint to be seen with the naked eye, however when it is near maximum brightness it can be seen with binoculars.[9]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 14h 22m 52.9255s[2] |
| Declination | +53° 48′ 37.307″[2] |
| Apparent magnitude (V) | 7.4 - 14.0[3] |
| Characteristics | |
| Spectral type | M3e-6e[3] |
| B−V color index | +1.3[4] |
| Variable type | Mira[3] |
| Astrometry | |
| Radial velocity (Rv) | −17.00[5] km/s |
| Proper motion (μ) | RA: +7.283[2] mas/yr Dec.: −12.789[2] mas/yr |
| Parallax (π) | 0.5746 ± 0.0407 mas[2] |
| Distance | 5,700 ± 400 ly (1,700 ± 100 pc) |
| Details | |
| Mass | 2.7[6] M☉ |
| Radius | 491[7] R☉ |
| Luminosity | 18,793[6] L☉ |
| Surface gravity (log g) | −0.53[6] cgs |
| Temperature | 3,007[6] K |
| Age | 631[6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
S Boötis was discovered at Bonn Observatory by Friedrich Wilhelm Argelander in 1860.[10][11][12]