Epsilon Ursae Majoris or Alioth is a white star in the Ursa Major constellation.
Quick facts Observation data Epoch J2000 Equinox J2000, Constellation ...
ε Ursae Majoris
ε Ursae Majoris in Ursa Major (circled). |
Observation data
Epoch J2000 Equinox J2000 |
| Constellation |
Ursa Major |
| Right ascension |
12h 54m 01.74959s[1] |
| Declination |
+55° 57′ 35.3627″[1] |
| Apparent magnitude (V) |
1.77[2] |
| Characteristics |
| Spectral type |
A1III-IVp kB9 |
| U−B color index |
+0.02[2] |
| B−V color index |
-0.02[2] |
| Variable type |
α2 CVn |
| Astrometry |
|---|
|
|---|
| Radial velocity (Rv) | -9.3[3] km/s |
| Proper motion (μ) | RA: +111.91[1] mas/yr
Dec.: -8.24[1] mas/yr |
| Parallax (π) | 39.51 ± 0.20[1] mas |
| Distance | 82.6 ± 0.4 ly
(25.3 ± 0.1 pc) |
| Absolute magnitude (MV) | –0.2[4] |
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| Details |
|---|
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|---|
| Mass | 2.91[5] M☉ |
| Radius | 4.14[6] R☉ |
| Luminosity | 102[7] L☉ |
| Surface gravity (log g) | 3.23[8] cgs |
| Temperature | 9,020[8] K |
| Metallicity [Fe/H] | +0.00[4] dex |
| Rotational velocity (v sin i) | 33[9] km/s |
| Age | 300[10] Myr |
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| Other designations |
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Alioth, Allioth, Aliath, ε UMa, 77 Ursae Majoris, BD+56°1627, FK5 483, GC 17518, HD 112185, HIP 62956, HR 4905, PPM 33769, SAO 28553. |
| Database references |
|---|
| SIMBAD | data |
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