Eta Sculptoris
Star in the constellation Sculptoris
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Eta Sculptoris, Latinized from η Sculptoris, is a single,[8] variable star in the central part[9] of the southern constellation of Sculptor. It is visible to the naked eye as a faint, red-hued star with an apparent visual magnitude that fluctuates around 4.81.[5] The star is located approximately 460 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +12 km/s.[6]
  | |
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Sculptor |
| Right ascension | 00h 27m 55.69820s[1] |
| Declination | −33° 00′ 25.7900″[1] |
| Apparent magnitude (V) | 4.8 - 4.9[2] |
| Characteristics | |
| Evolutionary stage | asymptotic giant branch[3] |
| Spectral type | M4III[4] |
| U−B color index | +1.81[5] |
| B−V color index | +1.64[5] |
| Variable type | SRS[2] |
| Astrometry | |
| Radial velocity (Rv) | +12.1±1.7[6] km/s |
| Proper motion (μ) | RA: −20.349[1] mas/yr Dec.: −49.911[1] mas/yr |
| Parallax (π) | 7.0975±0.2769 mas[1] |
| Distance | 460 ± 20 ly (141 ± 5 pc) |
| Absolute magnitude (MV) | −0.83[7] |
| Details | |
| Radius | 79.96+3.70 −9.85[1] R☉ |
| Luminosity | 1,012.3±44.6[1] L☉ |
| Temperature | 3,641+247 −82[1] K |
| Other designations | |
| η Scl, CD−33°152, FK5 2026, GC 544, HD 2429, HIP 2210, HR 105, SAO 192545, GSC 06994-01104 | |
| Database references | |
| SIMBAD | data |
This object is an aging red giant star,[4] currently on the asymptotic giant branch,[3] with a stellar classification of M4III.[4] With the supply of hydrogen at its core exhausted, the star has cooled and expanded. It now has 80 times the radius of the Sun.[1] Eta Sculptoris is classified as a semiregular variable with a visual magnitude that fluctuates between +4.80 and +4.90,[2] The pulsations have periods of 22.7, 23.5, 24.6, 47.3, 128.7 and 158.7 days.[11] On average, this star is radiating over a thousand times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 3,641 K.[1]