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Beta Gruis
Grus constellation map.png
The position of Beta Gruis in the Grus constellation.
Observation data
Epoch J2000      Equinox J2000
Constellation Grus
Right ascension 22h 42m 40.1s[1]
Declination -46° 53′ 05″[1]
Apparent magnitude (V) 2.13[1]
Spectral type M5 III[1]
U-B color index 1.67
B-V color index 1.60
Variable type LC[2]
Radial velocity (Rv) 1.6 ±0.9[1] km/s
Proper motion (μ) RA: 135.68 ±0.70[1] mas/yr
Dec.: -4.51 ±0.45[1] mas/yr
Parallax (π) 19.17 ± 0.75 mas
Distance 170 ± 7 ly
(52 ± 2 pc)
Absolute magnitude (MV) -1.52
Other designations
HR 8636, CD -47°14308, HD 214952, SAO 231258, FK5 856, CPD P-47 9896, HIP 112122.
Database references

Beta Gruis (β Gruis / β Gru) is the second brighest star in the southern constellation of Grus. It was considered the rear star in the tail of the constellation of the (Southern) Fish.[3]

It with α, δ, θ. ι, and λ Gru belonged to Piscis Austrinus in traditional Arabic astronomy.[4]

The estimated mass is about three times that of the Sun, and it has a surface temperature of approximately 3,400 K, just over half the surface temperature of the sun. This low temperature accounts for the star's dull red color. The total luminosity is about 3,800 times that of the Sun, and it has an estimated radius of 0.8 astronomical units (120,000,000 km), which is about 100 times that of the Sun.

Beta Gruis is a type LC "slow irregular variable" star that varies in magnitude from 2.0 to 2.3.[2]

Beta Gruis played a crucial part in Perth Observatory's tracking of Comet 2000WM1 Linear in December 2001.[5]


External links

Coordinates: Sky map 22h 42m 40.1s, −46° 53′ 05″



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