Pi Lupi

π Lupi

A light curve for Pi Lupi, adapted from Sharma et al. (2022)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Lupus
Right ascension 15h 05m 07.08596s[2]
Declination −47° 03′ 04.4976″[2]
Apparent magnitude (V) 3.89[3]
Characteristics
Spectral type B5V + B5IV[4]
U−B color index −0.59[3]
B−V color index −0.14[3]
Astrometry
Radial velocity (Rv)+4.50[5] km/s
Proper motion (μ) RA: −22.98[2] mas/yr
Dec.: −22.81[2] mas/yr
Parallax (π)7.36 ± 0.55 mas[2]
Distance440 ± 30 ly
(140 ± 10 pc)
Details
A
Mass4.5[6] M☉
Surface gravity (log g)4.5[6] cgs
Temperature16,000[6] K
Rotational velocity (v sin i)10[6] km/s
B
Mass4.7[6] M☉
Temperature14,000[6] K
Rotational velocity (v sin i)10[6] km/s
Age14[6] Myr
Other designations
CD−46°9773, HIP 73807, SAO 225426
π Lupi A: HD 133242, HR 5605
π Lupi B: HD 133243, HR 5606
Database references
SIMBADdata
A
B

π Lupi (Latinised to Pi Lupi) is a multiple star system in the southern constellation Lupus. Two components form a wide binary pair with an orbital period of 517 years and a semimajor axis of 1.59″. They belong to the Upper Centaurus Lupus component of the Sco–Cen complex.[4]

At least one of the components is a spectroscopic binary and produces eclipses 15.5 days apart, making it an eclipsing binary. There are also other brightness variations with a period of 16 hours that are likely to be pulsations of the Slowly pulsating B-type star. The eclipses are shallow, with the brightness dropping by only 1% or about 0.01 magnitudes. The amplitude of the pulsations is even smaller.[1]

π Lupi A (HR 5605, HD 133242) has been classified as a spectroscopic binary by at least two studies,[7][8] but both components may be spectroscopic binaries.[9]

  1. ^ a b Cite error: The named reference Sharma was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference van Leeuwen2007 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference aass34_1 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Nitschelm2004 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference an328_9_889 was invoked but never defined (see the help page).
  6. ^ a b c d e f g h Cite error: The named reference Gullikson2016 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference buscombe1975 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference chini2012 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference wds was invoked but never defined (see the help page).