Theta Reticuli (HIP 20020)

Theta Reticuli is a blue giant star in the constellation Reticulum. At 459 light years away, it shines at an apparent visual magnitude of 5.88. Theta Reticuli is a multiple-star system. It is moving through the Galaxy at a speed of 7 km/s relative to the Sun. Its projected Galactic orbit carries it between 23,800 and 30,100 light years from the center of the Galaxy.

Sky position: RA 4h 17.7m, Dec -63 15.6'

Common designations: Theta Reticuli, HIP 20020, HD 27657

Vistas of Many Worlds

An engaging romp through the Galaxy!



Galactic Orbit of Theta Reticuli

(compared to the Sun)

Eccentricity: 11.8% vs. 16.0%

Angle φ : 28.3 vs. 26.0

Semi-major axis : 8,272 pc vs. 8,686 pc

Semi-minor axis: 8,215 pc vs. 8,574 pc

Focus-to-center: 974 pc vs. 1,388 pc

Semilatus rectum : 8,158 pc vs. 8,464 pc

Perigalacticon: 7,299 pc vs. 7,297 pc

Apogalacticon: 9,246 pc vs. 10,074 pc
 


Some Tabulated XHIP Data for Theta Reticuli
(see also: SIMBAD)

Astrometry
2007A&A...474..653V
  Position Proper Motion
Right Ascension: 64.41777147 0.31 mas 5.40 1.50 mas/yr.
Declination: -63.25549179 0.33 mas 7.70 1.50 mas/yr.
     
Galactic Longitude: 275.08543213 -9.18 mas/yr.
Galactic Latitude: -41.01111749 2.04 mas/yr.

Parallax: 7.08 0.33 mas


Spectrography

Spectral Type: B9 III/IV 1975MSS...C01....0H.

Radial Velocity: 3.00 7.40 km/s [B rating] 2007AN....328..889K.

Iron Abundance [Fe/H]: n/a
 



Photometry
 
band magnitude Abs. Mag.
U
B 5.82 0.07
V 5.88 0.14
R
I 5.85 0.11
J
H
K

  B-V: -0.06       V-I: +0.03


Derivations

Heliocentric distance: 140.88 pc (4.7% margin of error)

Galactocentric distance: 7,392 pc

Transverse velocity: 6.3 km/s

3D heliocentric position and motion:

toward:   

Galactic center Galactic rotation North Galactic Pole
Position ( X, Y, Z) 9.4 pc -105.9 pc -92.4 pc
Velocity (U, V, W) -5.8 km/s -3.7 km/s -0.9 km/s

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