Gamma Equulei

γ Equulei
Location of γ Equulei (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Equuleus
Right ascension 21h 10m 20.50005s[1]
Declination 10° 07′ 53.6763″[1]
Apparent magnitude (V) 4.58 - 4.77[2]
Characteristics
Spectral type A9VpSrCrEu[3]
U−B color index +0.10[4]
B−V color index +0.26[4]
R−I color index +0.10
Variable type roAp[5]
Astrometry
Radial velocity (Rv)−16.489±0.0004[6] km/s
Proper motion (μ) RA: 48.74[1] mas/yr
Dec.:  mas/yr
Parallax (π)27.55 ± 0.62 mas[1]
Distance118 ± 3 ly
(36.3 ± 0.8 pc)
Absolute magnitude (MV)+1.90[7]
Details
Mass1.78+0.12
−0.17[8] M☉
Radius2.11±0.07[9] R☉
Luminosity11.0±0.93[9] L☉
Surface gravity (log g)4.47[10] cgs
Temperature7,550±150[9] K
Metallicity [Fe/H]+0.68[10] dex
Rotational velocity (v sin i)7.0±0.5[8] km/s
Age1.0[8] Gyr
Other designations
γ Equ, 5 Equ, BD+09°4732, FK5 1555, HD 201601, HIP 104521, HR 8097, SAO 126593[11]
Database references
SIMBADdata

Gamma Equulei, Latinized from γ Equulei, is a double star in the northern constellation of Equuleus. It is located at a distance of around 118 light-years (36 parsecs) from Earth and is visible to the naked eye with a slightly variable apparent visual magnitude of around 4.7. The star is drifting closer to the Sun with a radial velocity of −16.5 km/s.[6]

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  6. ^ a b Cite error: The named reference Soubiran_et_al_2018 was invoked but never defined (see the help page).
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  8. ^ a b c Cite error: The named reference Sikora_et_al_2019 was invoked but never defined (see the help page).
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  10. ^ a b Cite error: The named reference mnras374_2_664 was invoked but never defined (see the help page).
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