Theta Persei, a white main-sequence star in Perseus
Theta Persei is a white main-sequence star in the constellation Perseus. At 36 light years away, it shines at an apparent visual magnitude of 4.1.
Theta Persei (HIP 12777)
Theta Persei is a white main-sequence star in the constellation Perseus. At 36 light years away, it shines at an apparent visual magnitude of 4.10. Theta Persei is a multiple-star system. The star's age is estimated to be 2.8 billion years but is certainly no less than 1.7 billion years and no greater than 3.9 billion years. The iron abundance of Theta Persei is 0 (100.0% of the Sun). It is moving through the Galaxy at a speed of 30.5 km/s relative to the Sun. Its projected Galactic orbit carries it between 23,700 and 34,200 light years from the center of the Galaxy. It came closest to the Sun 285,000 years ago when it had brightened to magnitude 2.99 from a distance of 21.7 light years.
Sky position: RA 2h 44.2m, Dec +49° 13.8'
Common designations: Theta Persei, 13 Persei, HIP 12777, HD 16895, Gliese 107 A
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Brightest stars in Perseus:
(list all)
| Rank | Mag. | Star |
| 8 | 3.77 | Miram |
| 9 | 3.77 | Nu Persei |
| 10 | 3.79 | Misam |
| 11 | 3.84 | Atik |
| 12 | 3.93 | Tau Persei |
| 13 | 3.96 | 48 Persei |
| 14 | 3.98 | Menkhib |
| 15 | 4.01 | Phi Persei |
| 16 | 4.05 | Iota Persei |
17
| 4.10
) Theta Persei
| Rank | Mag. | Star |
| 18 | 4.12 | Mu Persei |
| 19 | 4.22 | 16 Persei |
| 20 | 4.25 | Lambda Persei |
| 21 | 4.25 | 58 Persei |
| 22 | 4.32 | Psi Persei |
| 23 | 4.36 | Sigma Persei |
| 24 | 4.56 | 17 Persei |
Hover over other bright stars to identify or click to jump.
Galactic Orbit of Theta Persei
(compared to the Sun)
E
ccentricity: 18.1% vs. 16.0%Angle φ : -28.6°vs. 26.0°
Semi-major axis : 8,877 pc vs. 8,686 pc
Semi-minor axis: 8,731 pc vs. 8,574 pc
Focus-to-center
: 1,607 pcvs. 1,388 pcSemilatus rectum : 8,586 pc vs. 8,464 pc
Perigalacticon: 7,270 pc vs. 7,297 pc
Apogalacticon
: 10,484 pcvs. 10,074 pcSome Tabulated XHIP Data for Theta Persei
(see also: SIMBAD)
Astrometry
2007A&A...474..653V
| Position | Proper Motion | |
| Right Ascension: | 41.04870044° ±0.13 mas | 334.66 ±0.17 mas/yr. |
| Declination: | 49.22866627° ±0.12 mas | -89.99 ±0.17 mas/yr. |
| Galactic Longitude: | 141.16465439° | 341.08 mas/yr. |
| Galactic Latitude: | -9.60984786° | 61.30 mas/yr. |
Parallax: 89.87 ± 0.22 mas
Spectrography
Spectral Type: F7V 2001AJ....121.2148G.
Radial Velocity: 24.44 ±0.10 km/s [A rating] 2002ApJS..141..503N, 2005ApJS..159..141V.
Iron Abundance [Fe/H]:
0.00 dex
2011A&A...525A..71W, 2009A&A...501..941H, 2007A&A...465..271R, 2006ApJ...652.1604B, 2006AJ....131.3069L, 2005PASJ...57...27T, 2005ApJS..161..444T, 2005ApJS..159..141V, 2005AJ....129.1063L, 2004A&A...420..183A, 2003AJ....126.2015H, 1999ApJ...521..753T, 1998A&A...338..623M, 1998A&A...338..161F, 1996A&A...314..191G, 1993A&A...275..101E.
Photometry
| band | magnitude | Abs. Mag. |
| U | ||
| B | 4.61 | 4.38 |
| V | 4.10 | 3.87 |
| R | 3.80 | 3.57 |
| I | 3.60 | 3.37 |
| J | 3.03 | 2.80 |
| H | 2.86 | 2.63 |
| K | 2.70 | 2.47 |
B-V: +0.51 V-I: +0.50
Derivations
Heliocentric distance: 11.13 pc (0.2% margin of error)
Galactocentric distance: 7,409 pc
Transverse velocity: 18.3 km/s
3D heliocentric position and motion:
|
toward: |
Galactic center | Galactic rotation | North Galactic Pole |
| Position ( X, Y, Z) | -8.5 pc | 6.9 pc | -1.9 pc |
| Velocity (U, V, W) | -30.5 km/s | 1.4 km/s | -0.9 km/s |