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] |
Distance | 440 ± 30
ly (140 ± 10 pc) |
Details | |
A | |
Mass | 4.5 [6] M☉ |
Surface gravity (log g) | 4.5 [6] cgs |
Temperature | 16,000 [6] K |
Rotational velocity (v sin i) | 10 [6] km/s |
B | |
Mass | 4.7 [6] M☉ |
Temperature | 14,000 [6] K |
Rotational velocity (v sin i) | 10 [6] km/s |
Age | 14 [6] Myr |
Other designations | |
π Lupi A: HD 133242, HR 5605 | |
π Lupi B: HD 133243, HR 5606 | |
Database references | |
SIMBAD | data |
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]
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] |
Distance | 440 ± 30
ly (140 ± 10 pc) |
Details | |
A | |
Mass | 4.5 [6] M☉ |
Surface gravity (log g) | 4.5 [6] cgs |
Temperature | 16,000 [6] K |
Rotational velocity (v sin i) | 10 [6] km/s |
B | |
Mass | 4.7 [6] M☉ |
Temperature | 14,000 [6] K |
Rotational velocity (v sin i) | 10 [6] km/s |
Age | 14 [6] Myr |
Other designations | |
π Lupi A: HD 133242, HR 5605 | |
π Lupi B: HD 133243, HR 5606 | |
Database references | |
SIMBAD | data |
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]