Phi1 Lupi information

φ¹ Lupi
	Location of φ1 Lupi (circled)
Observation data; Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Lupus
Right ascension	15h 21m 48.36967s
Declination	−36° 15′ 40.9525″
Apparent magnitude (V)	3.58
Characteristics
Spectral type	K5 III
U−B color index	+1.85
B−V color index	+1.534±0.005
Astrometry
Radial velocity (Rv)	−29.4±0.7 km/s
Proper motion (μ)	RA: −92.33 mas/yr ; Dec.: −85.67 mas/yr
Parallax (π)	11.86 ± 0.16 mas
Distance	275 ± 4 ly ; (84 ± 1 pc)
Absolute magnitude (MV)	−1.55
Details
Radius	40 R☉
Luminosity	711.28 L☉
Temperature	3,894±59 K
Other designations
	φ1 Lup, CD−35°10236, FK5 566, HD 136422, HIP 75177, HR 5705, SAO 206552
Database references
SIMBAD	data

A light curve for Phi¹ Lupi, plotted from *Hipparcos* data^[10]

Phi¹ Lupi is a solitary^[11] star in the southern constellation of Lupus. It is visible to the naked eye with an apparent visual magnitude of 3.58.^[2] Based upon an annual parallax shift of 11.86 mas as seen from Earth, it is located around 275 light years from the Sun. The star is drifting closer with a radial velocity of −29 km/s.^[5] It has an absolute magnitude of −1.55.^[6]

This is an evolved K-type giant star with a stellar classification of K5 III,^[3] which means it has used up its core hydrogen and has expanded. At present it has 40 times the radius of the Sun.^[7] It is a variable star of unknown type, with an amplitude of 0.008 in visual magnitude and a period of 4.82 days.^[12] The star is radiating 711^[4] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 3,894 K.^[8]

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[Ginestet2000-6] Cite error: The named reference Ginestet2000 was invoked but never defined (see the help page).

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[Strassmeier2000-8] Cite error: The named reference Strassmeier2000 was invoked but never defined (see the help page).

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[Koen2002-12] Cite error: The named reference Koen2002 was invoked but never defined (see the help page).

Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Location of φ¹ Lupi (circled)
Constellation	Lupus
Right ascension	15^h 21^m 48.36967^s^[1]
Declination	−36° 15′ 40.9525″^[1]
Apparent magnitude (V)	3.58^[2]
Characteristics
Spectral type	K5 III^[3]
U−B color index	+1.85^[2]
B−V color index	+1.534±0.005^[4]
Astrometry

Radial velocity (R_v)	−29.4±0.7^[5] km/s
Proper motion (μ)	RA: −92.33^[1] mas/yr Dec.: −85.67^[1] mas/yr
Parallax (π)	11.86 ± 0.16 mas^[1]
Distance	275 ± 4 ly (84 ± 1 pc)
Absolute magnitude (M_V)	−1.55^[6]

Details

Radius	40^[7] `R`_☉
Luminosity	711.28^[4] `L`_☉
Temperature	3,894±59^[8] K

Other designations
φ¹ Lup, CD−35°10236, FK5 566, HD 136422, HIP 75177, HR 5705, SAO 206552^[9]
Database references
SIMBAD	data

Phi1 Lupi information

and 2 Related for: Phi1 Lupi information

Phi1 Lupi

List of brightest natural objects in the sky