Nu-2 Lupi (HIP 75181)

Nu-2 Lupi is a yellow main-sequence star in the constellation Lupus. At 48 light years away, it shines at an apparent visual magnitude of 5.65. The star's age is estimated to be 11 billion years but is certainly no less than 7.6 billion years and no greater than 14 billion years. The iron abundance of Nu-2 Lupi is -0.29 (51.3% of the Sun). It is moving through the Galaxy at a speed of 133.3 km/s relative to the Sun. Its projected Galactic orbit carries it between 11,800 and 35,300 light years from the center of the Galaxy. Nu-2 Lupi has three confirmed planets known to date (July 2013).

Sky position: RA 15h 21.8m, Dec -48 19.2'

Common designations: Nu-2 Lupi, HIP 75181, HD 136352, HR 5699, Gliese 582

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Galactic Orbit of Nu-2 Lupi

(compared to the Sun)

Eccentricity: 49.9% vs. 16.0%

Angle φ : -122.1 vs. 26.0

Semi-major axis : 7,231 pc vs. 8,686 pc

Semi-minor axis: 6,266 pc vs. 8,574 pc

Focus-to-center: 3,609 pc vs. 1,388 pc

Semilatus rectum : 5,430 pc vs. 8,464 pc

Perigalacticon: 3,622 pc vs. 7,297 pc

Apogalacticon: 10,840 pc vs. 10,074 pc
 


Some Tabulated XHIP Data for Nu-2 Lupi
(see also: SIMBAD)

Astrometry
2007A&A...474..653V
  Position Proper Motion
Right Ascension: 230.45655600 0.30 mas -1,622.43 0.35 mas/yr.
Declination: -48.31695925 0.28 mas -275.56 0.33 mas/yr.
     
Galactic Longitude: 327.08093873 -1,508.51 mas/yr.
Galactic Latitude: 7.37660600 657.72 mas/yr.

Parallax: 67.51 0.39 mas


Spectrography

Spectral Type: G2- V 2006AJ....132..161G.

Radial Velocity: -66.50 0.59 km/s [A rating] 2005ApJS..159..141V.

Iron Abundance [Fe/H]: -0.29 0.01 dex  2011A&A...530A.138C, 2008A&A...487..373S, 2006MNRAS.370..163B, 2005ApJS..161..444T, 2005ApJS..159..141V, 2005A&A...437.1127S, 2003A&A...410..527B, 1996A&A...314..191G, 1994A&A...287..927G, 1991A&A...241..501G, 1989A&A...214..239B, 1986A&A...165..183F, 1986A&A...160..264F.
 



Photometry
 
band magnitude Abs. Mag.
U
B 6.29 5.44
V 5.65 4.80
R
I 5.02 4.17
J 4.31 3.45
H 3.90 3.04
K 4.16 3.31

  B-V: +0.64       V-I: +0.63


Derivations

Heliocentric distance: 14.81 pc (0.6% margin of error)

Galactocentric distance: 7,388 pc

Transverse velocity: 115.6 km/s

3D heliocentric position and motion:

toward:   

Galactic center Galactic rotation North Galactic Pole
Position ( X, Y, Z) 12.3 pc -8.0 pc 1.9 pc
Velocity (U, V, W) -117.9 km/s -49.9 km/s 37.3 km/s

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