Rho Pavonis

Rho Pavonis, Latinized from ρ Pavonis, is a single,^[10] variable star in the southern constellation of Pavo. It is yellow-white in hue and faintly visible to the naked eye with an apparent visual magnitude that fluctuates around 4.86.^[2] The star is located at a distance of approximately 190 light years from the Sun based on parallax,^[1] and is drifting further away with a radial velocity of +8 km/s.^[2] It is a candidate outlying member of the Tucana Association of co-moving stars.^[11]

A light curve for Rho Pavonis, plotted from TESS data^[12]

Rho Pavonis

Location of ρ Pavonis (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Pavo
Right ascension	20h 37m 35.31275s[1]
Declination	−61° 31′ 47.7145″[1]
Apparent magnitude (V)	4.86[2] (4.85 – 4.91)[3]
Characteristics
Spectral type	Fm δ Del[4]
U−B color index	+0.19[3]
B−V color index	+0.43[3]
Variable type	δ Sct[5]
Astrometry
Radial velocity (Rv)	+8.0±0.8[2] km/s
Proper motion (μ)	RA: +59.61[1] mas/yr Dec.: −72.69[1] mas/yr
Parallax (π)	17.20±0.24 mas[1]
Distance	190 ± 3 ly (58.1 ± 0.8 pc)
Absolute magnitude (MV)	1.04[6]
Details
Radius	4.33+0.39 −0.17[7] R☉
Luminosity	34.1±0.8[7] L☉
Temperature	6,704+136 −285[7] K
Rotational velocity (v sin i)	45.0[8] km/s
Other designations
ρ Pav, CPD−61°6495, FK5 3647, GC 28668, HD 195961, HIP 101773, HR 7859, SAO 254835[9]
Database references
SIMBAD	data

This is a metallic-line star with a stellar classification of Fm δ Del,^[4] where the suffix notation indicating it is a δ Delphini star. It is a Delta Scuti variable, varying in brightness by 0.03 magnitudes.^[13] The dominant pulsation period is 2.74 hours, but the effects of other pulsation periods are apparent in the light curve.^[14] The star has 4.3^[7] times the girth of the Sun and is spinning with a projected rotational velocity of 45 km/s.^[8] It is radiating 34^[7] times the luminosity of the Sun from its photosphere at an effective temperature of 6,704 K.^[7]