1 Lupi

This article is about i Lupi (1 Lupi). Not to be confused with ι (iota) Lupi.
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]
Distanceapprox. 1,800 ly
(approx. 550 pc)
Absolute magnitude (MV)−3.93[7]
Details
Mass6.9±0.1[8] M☉
Radius41.3+2.2
−1.7[1] R☉
Luminosity2,900[9] L☉
Temperature6,867[6] K
Rotational velocity (v sin i)3.9±0.2[5] km/s
Age47.1±3.8[8] Myr
Other designations
i Lup, 1 Lup, CD−31°11813, HD 135153, HIP 74604, HR 5660, SAO 206445[10]
Database references
SIMBADdata

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]

  1. ^ a b c d e f g h Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference MERMILLIOD was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Houk1978 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Gray2001 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference AmmlerVonEiff2012 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference Gontcharov was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference mnras410_1_190 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Mcdonald2012 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference mnras389_2_869 was invoked but never defined (see the help page).