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
New astronomy book
Vistas of Many Worlds
Theta Reticuli
(compared to the
Sun )
E
ccentricity:
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 +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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