R Normae
Variable star in the constellation Norma From Wikipedia, the free encyclopedia
R Normae is a Mira variable star located near Eta Normae[10] in the southern constellation of Norma. This is an intermediate-mass red giant star that is generating part of its energy through hydrogen fusion. Because this fusion is thought to be occurring under conditions of convection, it is generating an excess of lithium.[11] The star ranges from magnitude 6.5 to 12.8 and has a relatively long period of 496 days.[4] Located around 2,900[7] light-years distant, it shines with a luminosity 7764 times that of the Sun and has a surface temperature of 3161 K.[8]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Norma |
| Right ascension | 15h 35m 57.35429s[2] |
| Declination | −49° 30′ 28.6817″[2] |
| Apparent magnitude (V) | 7.69[3] (6.5–12.8)[4] |
| Characteristics | |
| Spectral type | M3-7[5] |
| U−B color index | +1.33[3] |
| B−V color index | +1.77[3] |
| Variable type | Mira[5] |
| Astrometry | |
| Radial velocity (Rv) | −22.0[6] km/s |
| Proper motion (μ) | RA: −0.63[2] mas/yr Dec.: −7.09[2] mas/yr |
| Parallax (π) | 1.72±2.79 mas[2] |
| Distance | 2,900 ly (900 pc)[7] ly |
| Details | |
| Luminosity | 7,764[8] L☉ |
| Temperature | 3,161[8] K |
| Other designations | |
| R Nor, CD−49°9787, GC 20939, GSC 08304-00824, HD 138743, HIP 76377, HIC 76377, SAO 225948.[9] | |
| Database references | |
| SIMBAD | data |
References
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