Eta Serpentis
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| Observation data Epoch J2000.0 |
|
|---|---|
| Constellation (pronunciation) |
Serpens |
| Right ascension | 18h 21m 18.6s |
| Declination | -02° 53' 56" |
| Apparent magnitude (V) | +3.23 |
| Absolute magnitude (V) | +1.84 |
| Distance | 61.8 ± 0.9 ly (18.9 ± 0.3 pc) |
| Spectral type | K0III-IV |
| Other designations | |
Eta Serpentis (η Ser / η Serpentis) is a binary star in the constellation Serpens. It carries the seldom used traditional name Tang (Mandarin 唐朝 - Táng Cháo), after the Tang Imperial Dynasty.
The primary, Eta Serpentis A is an orange K-type giant with an apparent magnitude of +3.23. It has a distant 12th magnitude companion, Eta Serpentis B, 3 arcminutes away. The Eta Serpentis star system is approximately 61.8 light years from Earth.
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