|This infobox, "Template:Starbox begin", is from Wikipedia. The list of its authors can be seen in its edit history page. The data in this infobox may not agree or state what Wikipedia states.|
Epoch J2000.0 Equinox J2000.0 (ICRS)
|Right ascension||18h 55m 07.14098s|
|Declination||−22° 40′ 16.8185″|
|Apparent magnitude (V)||+4.98|
|Spectral type||K1 Ib–II|
|B−V color index||+1.32|
|Radial velocity (Rv)||−109.6 km/s|
|Proper motion (μ)|| RA: −109.04 mas/yr |
Dec.: −35.25 mas/yr
|Parallax (π)||11.91 ± 0.52 mas|
|Distance||270 ± 10 ly |
(84 ± 4 pc)
|Absolute magnitude (MV)||+0.38|
|ν2 Sgr A|
|Surface gravity (log g)||1.03 cgs|
|Metallicity [Fe/H]||−0.13 dex|
Nu2 Sagittarii (ν2 Sagittarii) is a binary star system in the zodiac constellation of Sagittarius. It is faintly visible to the naked eye, having an apparent visual magnitude of +4.98. Based upon a small annual parallax shift of 11.91 mas as seen from Earth, this system is located around 270 light years from the Sun. Nu2 Sagittarii has a high peculiar velocity of +11.6
−14.4 km/s and is most likely a 86.0runaway star system.
The spectrum of the primary component displays a stellar classification of K1 Ib–II, indicating this is a K-type star with a mixed luminosity class of an evolved bright giant/supergiant star. It is a mild barium star, showing an enhanced abundance of s-process elements in its outer atmosphere. This material was most likely acquired during a previous mass transfer from its now white dwarf companion. The primary has an estimated 1.4 times the mass of the Sun and has expanded to 85 times the Sun's radius.
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