Eta Normae
G-type star in the constellation Norma
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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]
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| 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]