Omicron Lupi

Omicron Lupi
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Lupus
Right ascension 14h 51m 38.30289s[1]
Declination −43° 34′ 31.2965″[1]
Apparent magnitude (V) 4.323[2] (4.84 + 5.27)[3]
Characteristics
Spectral type B5 IV[3]
U−B color index −0.620[2]
B−V color index −0.159[2]
Astrometry
Radial velocity (Rv)+7.30±0.74[4] km/s
Proper motion (μ) RA: −25.20[1] mas/yr
Dec.: −27.13[1] mas/yr
Parallax (π)8.07 ± 0.59 mas[1]
Distance400 ± 30 ly
(124 ± 9 pc)
Absolute magnitude (MV)−1.2±0.3[5]
Details
Mass5.7±0.2[5] M
Radius3.5[5] R
Luminosity1,260[5] L
Surface gravity (log g)4.1±0.1[5] cgs
Temperature18,000[6] K
Rotational velocity (v sin i)25[6] km/s
Other designations
ο Lup, CD−43° 9391, HD 130807, HIP 72683, HR 5528, SAO 225248.[7]
Database references
SIMBADdata

Omicron Lupi (ο Lup) is a binary star[3] in the southern constellation of Lupus. It is a visible to the naked eye with a combined apparent visual magnitude of 4.323.[2] Based upon an annual parallax shift of 8.07 mas as seen from Earth,[1] it is located around 400 light-years from the Sun, give or take 30 light-years. At that distance, the visual magnitude of the system is diminished by an extinction factor of 0.13±0.01 due to interstellar dust.[5] It is a member of the Upper Centaurus–Lupus[8] subgroup of the nearby Scorpius–Centaurus association.[6]

This is a visual binary star system with the components having an angular separation of 0.1 arcsecond.[8] The primary, component A, is a magnitude 4.84 B-type subgiant star with a stellar classification of B5 V.[3] It displays radial velocity variations indicating it has an unseen second companion orbiting at a separation of at least 17 AU with a period of 27 years or more.[6] The spectrum of the primary displays a Zeeman effect indicating a magnetic field with a strength ranging from −94 to 677 G.[6] The visible companion, component B, has a visual magnitude of 5.27.[3]

  1. ^ a b c d e f 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 Cousins1973 was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  5. ^ a b c d e f Cite error: The named reference Petit2013 was invoked but never defined (see the help page).
  6. ^ a b c d e Cite error: The named reference Alecian2011 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Chen2012 was invoked but never defined (see the help page).