NU Pavonis
NU Pavonis (N-U, not "nu") is a variable star in the southern constellation of Pavo. With a nominal apparent visual magnitude of 4.95, it is a faint star but visible to the naked eye. The distance to NU Pav, as determined from its annual parallax shift of 7.0 mas as seen from Earth's orbit, is around 460 light years. It is moving closer with a heliocentric radial velocity of −10 km/s.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pavo |
| Right ascension | 20h 01m 44.74682s |
| Declination | −59° 22′ 33.1864″ |
| Apparent magnitude (V) | 4.95 |
| Characteristics | |
| Spectral type | M6 III |
| B−V color index | 1.356±0.011 |
| Variable type | SRb |
| Astrometry | |
| Radial velocity (Rv) | −10.3±2.8 km/s |
| Proper motion (μ) | RA: +20.385 mas/yr Dec.: −26.769 mas/yr |
| Parallax (π) | 7.0208 ± 0.4464 mas |
| Distance | 460 ± 30 ly (142 ± 9 pc) |
| Absolute magnitude (MV) | −0.86 |
| Details | |
| Radius | 204±29 R☉ |
| Luminosity | 7,412 L☉ |
| Surface gravity (log g) | 0.87 cgs |
| Temperature | 3,516±275 K |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is an aging red giant with a stellar classification of M6 III, currently on the asymptotic giant branch. It is a semiregular variable star of sub-type SRb that ranges in magnitude from 4.91 down to 5.26 with a period of 60 days. The star has expanded to 204 times the Sun's radius and is radiating 7,412 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,516 K. Far-ultraviolet emission has been detected from these coordinates, which may be coming from a companion star.