| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Serpens[2] |
| Right ascension | 15h 50m 41.73245s[3] |
| Declination | +15° 08′ 01.0810″[3] |
| Apparent magnitude (V) | 5.2 - 14.4[4] |
| Characteristics | |
| Evolutionary stage | AGB[5] |
| Spectral type | M5-8e[6] |
| B−Vcolor index | 1.500±0.510[2] |
| Variable type | Mira[4] |
| Astrometry | |
| Radial velocity (Rv) | 23.8±0.8[7] km/s |
| Proper motion (μ) | RA: +2.387[3]mas/yr Dec.: −36.699[3]mas/yr |
| Parallax (π) | 3.5110±0.2966 mas[3] |
| Distance | 930 ± 80 ly (280 ± 20 pc) |
| Details | |
| Mass | 3.6[8] M☉ |
| Radius | 79[9] R☉ |
| Luminosity | 758[9] L☉ |
| Surface gravity (log g) | 1.55[8] cgs |
| Temperature | 3,413[9] K |
| Other designations | |
| R Ser,BD+15°2918,HD 141850,HIP 77615,HR 5894,SAO 101771[10] | |
| Database references | |
| SIMBAD | data |
R Serpentis is aMira variable type star in theequatorialconstellation ofSerpens. It ranges between apparent magnitude 5.16 and 14.4, and spectral types M5e to M8e, over a period of 356.41 days.[4][11] The variability of this star was discovered in 1826 byKarl Ludwig Harding.[12]
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