3 Equulei
3 Equulei is a single star located in the small northern constellation of Equuleus. It is faintly visible to the naked eye at an apparent visual magnitude of 5.6. Based upon an annual parallax shift of 4.24 mas, 3 Equulei is roughly 770 light-years (240 parsecs) distant from Earth, give or take an 80 light-year margin of error. At that distance, the apparent brightness of the star is diminished by 0.15 in visual magnitude because of extinction from interstellar gas and dust.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Equuleus |
| Right ascension | 21h 04m 34.65147s |
| Declination | +5° 30′ 10.3032″ |
| Apparent magnitude (V) | 5.593 |
| Characteristics | |
| Spectral type | K5 III |
| U−B color index | +1.934 |
| B−V color index | +1.651 |
| Astrometry | |
| Radial velocity (Rv) | –15.26 ± 0.2 km/s |
| Proper motion (μ) | RA: +13.15 mas/yr Dec.: +0.66 mas/yr |
| Parallax (π) | 4.24 ± 0.42 mas |
| Distance | 770 ± 80 ly (240 ± 20 pc) |
| Absolute magnitude (MV) | –1.02 |
| Details | |
| Radius | 63 R☉ |
| Luminosity | 949 L☉ |
| Temperature | 3,893 K |
| Rotational velocity (v sin i) | 4.6 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
3 Equulei has been referred to in some sources as ζ (Zeta) Equulei, although it was not given that designation by Bayer.
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