Nu-2 Lupi, a yellow main-sequence star in Lupus
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.
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 know to date (early 2012).
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)
E
ccentricity: 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 pcvs. 1,388 pcSemilatus rectum : 5,430 pc vs. 8,464 pc
Perigalacticon: 3,622 pc vs. 7,297 pc
Apogalacticon
: 10,840 pcvs. 10,074 pcSome 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 |