Eta Normae

Eta Normae, Latinized from η Normae, is a single^[8] star in the southern constellation of Norma. It is visible to the naked eye as a faint, yellow-hued star with an apparent visual magnitude of 4.65.^[2] The distance to this star is about 219 light years, based on parallax.^[1] The Gamma Normids radiate from a position near this star.^[9]

Eta Normae

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Norma
Right ascension	16h 03m 12.89783s[1]
Declination	−49° 13′ 46.9151″[1]
Apparent magnitude (V)	4.65[2]
Characteristics
Evolutionary stage	red clump[3]
Spectral type	G8III[4]
U−B color index	+0.64[2]
B−V color index	+0.92[2]
Astrometry
Radial velocity (Rv)	−0.3±2.8[5] km/s
Proper motion (μ)	RA: 42.05[1] mas/yr Dec.: 9.14[1] mas/yr
Parallax (π)	14.86±0.25 mas[1]
Distance	219 ± 4 ly (67 ± 1 pc)
Absolute magnitude (MV)	0.524[3]
Details
Mass	2.78[3] M☉
Radius	11.07+0.23 −0.09[6] R☉
Luminosity	71.9±3.1[6] L☉
Surface gravity (log g)	2.84[3] cgs
Temperature	5052+16 −51[6] K
Metallicity [Fe/H]	−0.05[3] dex
Other designations
η Nor, CD−48°10512, HD 143546, HIP 78639, HR 5962, SAO 226466[7]
Database references
SIMBAD	data

This is an aging giant star with a stellar classification of G8III,^[4] having exhausted the supply of hydrogen at its core then swollen and cooled off the main sequence. At present it has a diameter of 11^[6] times that of the Sun. It is a red clump^[3] giant, meaning it is on the horizontal branch and is generating energy through core helium fusion. The star has 2.78^[3] times the mass of the Sun and is radiating 72^[6] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 5,052 K.^[6] It is a source for X-ray emission.^[10]