1 Lupi

Last updated
1 Lupi
Observation data
Epoch J2000.0       Equinox J2000.0
Constellation Lupus
Right ascension 15h 14m 37.32104s [1]
Declination −31° 31 08.8434 [1]
Apparent magnitude  (V)4.90 [2]
Characteristics
Spectral type F1 III [3] or F0 Ib-II [4]
U−B color index +0.26 [2]
B−V color index 0.37 [5]
Astrometry
Radial velocity (Rv)−22.80 [6]  km/s
Proper motion (μ)RA: −9.873 [1]   mas/yr
Dec.: –0.892 [1]   mas/yr
Parallax (π)1.8055 ± 0.1876  mas [1]
Distance approx. 1,800  ly
(approx. 550  pc)
Absolute magnitude  (MV)−3.93 [7]
Details
Mass 6.9±0.1 [8]   M
Radius 41.3+2.2
−1.7
[1]   R
Luminosity 2,900 [9]   L
Temperature 6,867 [6]   K
Rotational velocity (v sin i)3.9±0.2 [5]  km/s
Age 47.1±3.8 [8]   Myr
Other designations
i Lup, 1 Lup, CD−31°11813, HD  135153, HIP  74604, HR  5660, SAO  206445 [10]
Database references
SIMBAD data

1 Lupi is a solitary [11] giant star in the southern constellation of Lupus. It has the Bayer designation i Lupi; 1 Lupi is the Flamsteed designation. The apparent visual magnitude is 4.90, [2] which indicates it is faintly visible to the naked eye. Based on parallax measurements, this star is approximately 1,800  light-years from the Sun. [1] It is moving closer to the Earth with a heliocentric radial velocity of −23 km/s. [6]

Houk (1978) assigned the spectral classification of this star as F1III, [3] which suggests it is an F-type (yellow-white) star that has evolved away from the main sequence and expanded into a giant. However, Gray et al. (2001) found a class of F0 Ib-II, [4] matching a supergiant/bright giant star. It has a mass around seven times that of the Sun [8] and has expanded to 41 [1] times the Sun's radius. The star is radiating 2,900 [9] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 6,867  K . [6] The estimated age of the star is around 47 million years. [8]

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References

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