R Reticuli
Variable star in the constellation Reticulum
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R Reticuli, also listed under the duplicate variable star designation S Reticuli,[4] is a Mira variable star in the southern constellation Reticulum. It is an aging red giant star on the asymptotic giant branch[5] with a stellar classification that varies between M4e to M7.5e,[6] being hottest near maximum visual magnitude.[10] The brightness of the star varies between apparent visual magnitudes 6.35 and 14.2[4] with an average period of 281.08±0.58 d.[11] The mean maximum magnitude is 7.57 and the mean minimum magnitude 13.80.[11]
Right ascension04h 33m 32.83070s[2]
Declination−63° 01′ 44.9951″[2]
Apparentmagnitude(V)9.23[3] (6.35 – 14.2)[4]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Reticulum |
| Right ascension | 04h 33m 32.83070s[2] |
| Declination | −63° 01′ 44.9951″[2] |
| Apparent magnitude (V) | 9.23[3] (6.35 – 14.2)[4] |
| Characteristics | |
| Evolutionary stage | AGB[5] |
| Spectral type | M4e - M7.5e[6] |
| B−V color index | 1.099±0.045[3] |
| Variable type | Mira[6] |
| Astrometry | |
| Radial velocity (Rv) | 26.0±4.6[3] km/s |
| Proper motion (μ) | RA: +12.111[2] mas/yr Dec.: +16.384[2] mas/yr |
| Parallax (π) | 1.3622±0.0492 mas[2] |
| Distance | 2,390 ± 90 ly (730 ± 30 pc) |
| Details | |
| Mass | 0.88+0.04 −0[7] M☉ |
| Radius | 249+21 −34[8] R☉ |
| Luminosity | 7,571±1,671[8] L☉ |
| Surface gravity (log g) | −0.445[7] cgs |
| Temperature | 3,410+264 −131[8] K |
| Metallicity [Fe/H] | 0.55[7] dex |
| Other designations | |
| R Ret, S Ret, HD 29383, HIP 21252, SAO 249053[9] | |
| Database references | |
| SIMBAD | data |
