Atlas (star)
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| Observation data Equinox J2000 |
|
|---|---|
| Constellation | Pleiades |
| Right ascension | 03h 49m 09.7s |
| Declination | +24° 03′ 12″ |
| Apparent magnitude (V) | 3.62 |
| Characteristics | |
| Spectral type | B8 III |
| U-B color index | -0.36 |
| B-V color index | -0.09 |
| Variable type | Suspected |
| Astrometry | |
| Radial velocity (Rv) | +8.5 km/s |
| Proper motion (μ) | RA: 17.77 mas/yr Dec.: -44.7 mas/yr |
| Parallax (π) | 8.57 ± 1.03 mas |
| Distance | 381 ly (117 pc) |
| Absolute magnitude (MV) | 2.55 |
| Other designations | |
Atlas is a triple star system in the Pleiades open cluster (M45). It is also known as 27 Tauri.
The primary component, Atlas A, is a blue-white B-type giant with an apparent magnitude of +3.62. It is a spectroscopic binary whose components have magnitudes of +4.1 and +5.6. The binary makes one orbit every 1250 days. Atlas also has a dimmer magnitude +6.8 companion, Atlas B, at a separation of 0.4 arcseconds or at least 52 Astronomical Units away.
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They named a highly regarded book after it.
