NU Pavonis

Not to be confused with Nu (𝜈) 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,^[3] 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^[2] as seen from Earth's orbit, is around 460 light years. It is moving closer with a heliocentric radial velocity of −10 km/s.^[6]

NU Pavonis

A visual band light curve for NU Pavonis, plotted from data published by Tabur et al. (2009)[1]
Observation data Epoch J2000      Equinox J2000
Constellation	Pavo
Right ascension	20h 01m 44.74682s[2]
Declination	−59° 22′ 33.1864″[2]
Apparent magnitude (V)	4.95[3]
Characteristics
Spectral type	M6 III[4]
B−V color index	1.356±0.011[3]
Variable type	SRb[5]
Astrometry
Radial velocity (Rv)	−10.3±2.8[6] km/s
Proper motion (μ)	RA: +20.385[2] mas/yr Dec.: −26.769[2] mas/yr
Parallax (π)	7.0208±0.4464 mas[2]
Distance	460 ± 30 ly (142 ± 9 pc)
Absolute magnitude (MV)	−0.86[3]
Details
Radius	204±29[7] R☉
Luminosity	7,412[3] L☉
Surface gravity (log g)	0.87[8] cgs
Temperature	3,516±275[7] K
Other designations
NU Pav, CD−59° 7361, FK5 3598, HD 189124, HIP 98608, HR 7625, SAO 246389[9]
Database references
SIMBAD	data

This is an aging red giant with a stellar classification of M6 III,^[4] currently on the asymptotic giant branch. Peter M. Corben listed HR 7625 as a possible variable star in 1971.^[10] It was given its variable star designation, NU Pavonis, in 1973.^[11] 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.^[7] The star has expanded to 204^[7] times the Sun's radius and is radiating 7,412^[3] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,516 K.^[7] Far-ultraviolet emission has been detected from these coordinates, which may be coming from a companion star.^[8]