R Serpentis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Serpens |
| Right ascension | 15h 50m 41.73245s |
| Declination | +15° 08′ 01.0810″ |
| Apparent magnitude (V) | 5.2 - 14.4 |
| Characteristics | |
| Evolutionary stage | AGB |
| Spectral type | M5-8e |
| B−V color index | 1.500±0.510 |
| Variable type | Mira |
| Astrometry | |
| Radial velocity (Rv) | 23.8±0.8 km/s |
| Proper motion (μ) | RA: +2.387 mas/yr Dec.: −36.699 mas/yr |
| Parallax (π) | 3.5110±0.2966 mas |
| Distance | 930 ± 80 ly (280 ± 20 pc) |
| Details | |
| Mass | 3.6 M☉ |
| Radius | 79 R☉ |
| Luminosity | 758 L☉ |
| Surface gravity (log g) | 1.55 cgs |
| Temperature | 3,413 K |
| Other designations | |
| R Ser, BD+15°2918, HD 141850, HIP 77615, HR 5894, SAO 101771 | |
| Database references | |
| SIMBAD | data |
R Serpentis is a Mira variable type star in the equatorial constellation of Serpens. It ranges between apparent magnitude 5.16 and 14.4, and spectral types M5e to M8e, over a period of 356.41 days. The variability of this star was discovered in 1826 by Karl Ludwig Harding.