Nu Caeli (HIP 22488)

Nu Caeli is a white main-sequence star in the constellation Caelum. At 171 light years away, it shines at an apparent visual magnitude of 6.06. Nu Caeli is the primary component of a multiple-star system. The star's age is estimated to be 1.8 billion years but is certainly no less than 1.7 billion years and no greater than 1.9 billion years. The iron abundance of Nu Caeli is -0.13 (74.1% of the Sun). It is moving through the Galaxy at a speed of 29 km/s relative to the Sun. Its projected Galactic orbit carries it between 23,900 and 27,000 light years from the center of the Galaxy. It came closest to the Sun 1.5 million years ago when it had brightened to magnitude 4.84 from a distance of 98 light years.

Sky position: RA 4h 50.3m, Dec -41 19.2'

Common designations: Nu Caeli, HIP 22488, HD 30985, HR 1557

Galaxies
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Galactic Orbit of Nu Caeli

(compared to the Sun)

Eccentricity: 6.1% vs. 16.0%

Angle φ : -38.6 vs. 26.0

Semi-major axis : 7,801 pc vs. 8,686 pc

Semi-minor axis: 7,787 pc vs. 8,574 pc

Focus-to-center: 478 pc vs. 1,388 pc

Semilatus rectum : 7,772 pc vs. 8,464 pc

Perigalacticon: 7,323 pc vs. 7,297 pc

Apogalacticon: 8,280 pc vs. 10,074 pc
 


Some Tabulated XHIP Data for Nu Caeli
(see also: SIMBAD)

Astrometry
2007A&A...474..653V
  Position Proper Motion
Right Ascension: 72.56743010 0.25 mas -3.18 0.27 mas/yr.
Declination: -41.32100992 0.30 mas 66.33 0.34 mas/yr.
     
Galactic Longitude: 245.54326915 -66.40 mas/yr.
Galactic Latitude: -39.65937953 0.79 mas/yr.

Parallax: 19.03 0.32 mas


Spectrography

Spectral Type: F2/3V 1978MSS...C02....0H.

Radial Velocity: 23.80 0.80 km/s [A rating] 2006AstL...32..759G.

Iron Abundance [Fe/H]: -0.13 0.08 dex  2011A&A...530A.138C.
 



Photometry
 
band magnitude Abs. Mag.
U
B 6.47 2.87
V 6.06 2.46
R
I 5.63 2.03
J
H
K

  B-V: +0.41       V-I: +0.43


Derivations

Heliocentric distance: 52.53 pc (1.7% margin of error)

Galactocentric distance: 7,417 pc

Transverse velocity: 16.5 km/s

3D heliocentric position and motion:

toward:   

Galactic center Galactic rotation North Galactic Pole
Position ( X, Y, Z) -16.7 pc -36.8 pc -33.5 pc
Velocity (U, V, W) -22.7 km/s -9.9 km/s -15.0 km/s

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