Theta Reticuli, a blue giant star in Reticulum
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 (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
Galactic Orbit of
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 pcvs. 1,388 pcSemilatus rectum : 8,158 pc vs. 8,464 pc
Perigalacticon: 7,299 pc vs. 7,297 pc
Apogalacticon
: 9,246 pcvs. 10,074 pcSome 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 |