Phi2 Lupi

For other stars with this Bayer designation, see φ Lupi.
Phi2 Lupi
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Lupus
Right ascension 15h 23m 09.35005s[1]
Declination −36° 51′ 30.5521″[1]
Apparent magnitude (V) 4.535[2]
Characteristics
Spectral type B4 V[3][4]
U−B color index −0.648[2]
B−V color index −0.161[2]
Astrometry
Radial velocity (Rv)+0.80±2.70[5] km/s
Proper motion (μ) RA: −18.24[1] mas/yr
Dec.: −20.72[1] mas/yr
Parallax (π)6.28 ± 0.20 mas[1]
Distance520 ± 20 ly
(159 ± 5 pc)
Absolute magnitude (MV)−1.47[6]
Details
Mass6.1±0.1[4] M☉
Radius3.4[7] R☉
Luminosity800[8] L☉
Temperature16,780[3] K
Rotational velocity (v sin i)141±6[3] km/s
Age39.9±10.1[4] Myr
Other designations
φ2 Lup, CD−36° 10103, FK5 1403, HD 136664, HIP 75304, HR 5712, SAO 206580.[9]
Database references
SIMBADdata

Phi2 Lupi, Latinized from φ2 Lupi, is a solitary[10] star in the southern constellation of Lupus. With an apparent magnitude of 4.535,[2] it is bright enough to be seen with the naked eye. Based upon an annual parallax shift of 6.28 mas as seen from Earth, it is located around 520 light years from the Sun. At that distance, the visual magnitude of the star is diminished by an extinction factor of 0.052±0.013 due to interstellar dust. It is a member of the Upper Centaurus–Lupus subgroup of the Scorpius–Centaurus association.[11]

This is an ordinary B-type main sequence star with a stellar classification of B4 V.[3][4] It has an estimated 6.1[4] times the mass of the Sun and about 3.4[7] times the Sun's radius. The star is roughly 40[4] million years and is spinning with a projected rotational velocity of 141 km/s.[3] It is radiating about 800[8] times the solar luminosity from its photosphere at an effective temperature of 16,780 K.[3]

  1. ^ a b c d e Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Kozok1985 was invoked but never defined (see the help page).
  3. ^ a b c d e f Cite error: The named reference Braganca2012 was invoked but never defined (see the help page).
  4. ^ a b c d e f Cite error: The named reference Tetzlaff2011 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference PasinettiFracassini2001 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Mcdonald2012 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Chen2012 was invoked but never defined (see the help page).