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3 Equulei

3 Equulei
Location of 3 Equulei (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Equuleus
Right ascension 21h 04m 34.65147s[1]
Declination +5° 30′ 10.3032″[1]
Apparent magnitude (V) 5.593[2]
Characteristics
Spectral type K5 III[3]
U−B color index +1.934[2]
B−V color index +1.651[2]
Astrometry
Radial velocity (Rv)–15.26 ± 0.2[4] km/s
Proper motion (μ) RA: +13.15[1] mas/yr
Dec.: +0.66[1] mas/yr
Parallax (π)4.24 ± 0.42 mas[1]
Distance770 ± 80 ly
(240 ± 20 pc)
Absolute magnitude (MV)–1.02[5]
Details
Radius63[6] R☉
Luminosity949[7] L☉
Temperature3,893[8] K
Rotational velocity (v sin i)4.6[7] km/s
Other designations
ζ Equ, 3 Equ, BD+04° 4606, HD 200644, HIP 104031, HR 8066, SAO 126518.[9]
Database references
SIMBADdata

3 Equulei is a single[3] 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.[2] Based upon an annual parallax shift of 4.24 mas,[1] 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.[4]

3 Equulei has been referred to in some sources as ζ (Zeta) Equulei, although it was not given that designation by Bayer.[10]

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