Sigma Piscium, a blue main-sequence star in Pisces
Sigma Piscium is a blue main-sequence star in the constellation Pisces. At 433 light years away, it shines at an apparent visual magnitude of 5.5.
Sigma Piscium (HIP 4889)
Sigma Piscium is a blue main-sequence star in the constellation Pisces. At 433 light years away, it shines at an apparent visual magnitude of 5.50. It is moving through the Galaxy at a speed of 23.5 km/s relative to the Sun. Its projected Galactic orbit carries it between 24,300 and 29,400 light years from the center of the Galaxy.
Sky position: RA 1h 2.8m, Dec +31° 48'
Common designations: Sigma Piscium, 69 Piscium, HIP 4889, HD 6118
Brightest stars in Pisces:
(list all)
| Rank | Mag. | Star |
| 34 | 5.35 | Rho Piscium |
| 35 | 5.36 | 55 Piscium |
| 36 | 5.36 | 57 Piscium |
| 37 | 5.38 | 41 Piscium |
| 38 | 5.38 | 52 Piscium |
| 39 | 5.42 | A Piscium |
| 40 | 5.43 | 2 Piscium |
| 41 | 5.44 | 68 Piscium |
| 42 | 5.49 | 20 Piscium |
43
| 5.50
) Sigma Piscium
| Rank | Mag. | Star |
| 44 | 5.50 | 94 Piscium |
| 45 | 5.51 | 58 Piscium |
| 46 | 5.51 | 80 Piscium |
| 47 | 5.54 | 34 Piscium |
| 48 | 5.54 | Pi Piscium |
| 49 | 5.55 | 65 Piscium |
| 50 | 5.55 | Psi-1 Piscium B |
Hover over other bright stars to identify or click to jump.
Galactic Orbit of Sigma Piscium
(compared to the Sun)
E
ccentricity: 9.5% vs. 16.0%Angle φ : 9.7°vs. 26.0°
Semi-major axis : 8,243 pc vs. 8,686 pc
Semi-minor axis: 8,205 pc vs. 8,574 pc
Focus-to-center
: 785 pcvs. 1,388 pcSemilatus rectum : 8,168 pc vs. 8,464 pc
Perigalacticon: 7,458 pc vs. 7,297 pc
Apogalacticon
: 9,028 pcvs. 10,074 pcSome Tabulated XHIP Data for Sigma Piscium
(see also: SIMBAD)
Astrometry
2007A&A...474..653V
| Position | Proper Motion | |
| Right Ascension: | 15.70452754° ±0.26 mas | 14.37 ±0.31 mas/yr. |
| Declination: | 31.80433662° ±0.14 mas | -30.28 ±0.16 mas/yr. |
| Galactic Longitude: | 125.75282031° | 15.91 mas/yr. |
| Galactic Latitude: | -31.00507368° | -29.50 mas/yr. |
Parallax: 7.52 ± 0.26 mas
Spectrography
Spectral Type: B9.5V 1969AJ.....74..375C.
Radial Velocity:
10.40 ±4.30 km/s [D rating]
2006AstL...32..759G.
This star is a spectroscopic binary with an unsolved orbit.
Iron Abundance [Fe/H]:
n/a
Photometry
band
magnitude
Abs. Mag.
U
B
5.46
-0.16
V
5.50
-0.12
R
I
5.51
-0.10
J
5.55
-0.06
H
5.62
0.00
K
5.62
0.00
B-V: -0.04 V-I: -0.01
Derivations
Heliocentric distance: 132.79 pc (3.5% margin of error)
Galactocentric distance: 7,467 pc
Transverse velocity: 21.1 km/s
3D heliocentric position and motion:
|
toward: |
Galactic center | Galactic rotation | North Galactic Pole |
| Position ( X, Y, Z) | -66.5 pc | 92.4 pc | -68.4 pc |
| Velocity (U, V, W) | -7.7 km/s | -6.4 km/s | -21.3 km/s |