89 Herculis

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89 Herculis

Location of 89 Her (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Hercules
Right ascension 17h 55m 25.18892s[1]
Declination 26° 02′ 59.9738″[1]
Apparent magnitude (V) 5.36[2] (5.34 - 5.54[3])
Characteristics
Evolutionary stage post-AGB
Spectral type F2Ibe[4]
U−B color index −0.34[2]
B−V color index +0.34[2]
Variable type SRd[3]
Astrometry
Radial velocity (Rv) −28.5[5] km/s
Proper motion (μ) RA: 4.34[1] mas/yr
Dec.: 5.89[1] mas/yr
Parallax (π) 0.76 ± 0.23[1] mas
Distance approx. 4,000 ly
(approx. 1,300 pc)
Absolute magnitude (MV) −6.5[6]
Details
Mass 1.0[7] M☉
Radius 71.0[7] R☉
Luminosity 8,350[7] L☉
Surface gravity (log g) 0.55[4] cgs
Temperature 6,550[4] K
Metallicity −0.5[4]
Rotational velocity (v sin i) 23[8] km/s
Other designations
89 Her, V441 Her, HR 6685, BD +26° 3120, HD 163506, FK5 1468, HIP 87747, SAO 85545, GC 24382, AAVSO 1751+26
Database references
SIMBAD data
Exoplanet Archive data

89 Herculis is a fifth-magnitude star in the constellation Hercules. Located about 4,000 light years away, it is among a rare class of post-AGB stars - low mass stars in the last stages of their lives, highly inflated to appear as supergiants.[4]

89 Her is a spectroscopic binary system with the pair surrounded by a dusty disc. The system shows variable brightness and spectral line profiles.[9] The companion has a very low mass and luminosity and orbits the primary in 288 days.[4]

89 Her is classified as a semiregular variable star, V441 Her, varying from magnitude 5.3 to 5.5 in around 68 days.[3]

References

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External links

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