74 Aquarii

74 Aquarii

A light curve for HI Aquarii, plotted from TESS data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 22h 53m 28.70492s[2]
Declination −11° 36′ 59.4532″[2]
Apparent magnitude (V) 5.8[3]
Characteristics
Spectral type B8IV/V[4] (B9pHgMn)[3])
U−B color index −0.245[5]
B−V color index −0.082[5]
Variable type a2 CVn[3]
Astrometry
Proper motion (μ) RA: +21.539[2] mas/yr
Dec.: +2.282[2] mas/yr
Parallax (π)5.5008 ± 0.6556 mas[2]
Distanceapprox. 590 ly
(approx. 180 pc)
Absolute magnitude (MV)−1.19[6]
Orbit[7]
Primary74 Aquarii A
Companion74 Aquarii B
Period (P)9.479±0.044 yr
Semi-major axis (a)0.0460±0.0061″
Eccentricity (e)0.862±0.029
Inclination (i)29.8±17.4°
Longitude of the node (Ω)40.9±20.3°
Periastron epoch (T)2010.039±0.134
Argument of periastron (ω)
(secondary)		70.7±16.1°
Orbit[8]
Primary74 Aquarii Aa
Companion74 Aquarii Ab
Period (P)3.429616±0.000004 d
Eccentricity (e)0.05±0.02
Periastron epoch (T)2452909.150±0.007 JD
Argument of periastron (ω)
(secondary)		86.5±0.8°
Semi-amplitude (K1)
(primary)		95±2 km/s
Semi-amplitude (K2)
(secondary)		113±2 km/s
Details
Aa
Mass2.72[9] M☉
Rotational velocity (v sin i)20[10] km/s
Ab
Mass2.53[9] M☉
B
Mass3.11[9] M☉
Other designations
HI Aqr, BD–12 6371, HD 216494, HIP 113031, HR 8704, SAO 165359[11]
Database references
SIMBADdata

74 Aquarii (abbreviated 74 Aqr) is a triple star[12] system in the constellation of Aquarius. 74 Aquarii is its Flamsteed designation and it also bears the variable star designation HI Aquarii. The combined apparent visual magnitude is 5.8,[5] although it is very slightly variable,[3] and it is located at a distance of 590 light-years (180 parsecs) from Earth.

Jean Manfroid and Gautier Mathys reported that 74 Aquarii is a variable star in 1985.[13] Based on that result it was given its variable star designation in 1987.[14]

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  5. ^ a b c Cite error: The named reference sps1966 was invoked but never defined (see the help page).
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  14. ^ Cite error: The named reference Kholopov was invoked but never defined (see the help page).