Upsilon Andromedae, a white main-sequence star in Andromeda
Upsilon Andromedae is a white main-sequence star in the constellation Andromeda. At 44 light years away, it shines at an apparent visual magnitude of 4.1.
Upsilon Andromedae (HIP 7513)
Upsilon Andromedae is a white main-sequence star in the constellation Andromeda. At 44 light years away, it shines at an apparent visual magnitude of 4.10. Upsilon Andromedae is the primary component of a multiple-star system. The star's age is estimated to be 3.1 billion years but is certainly no less than 2.7 billion years and no greater than 3.3 billion years. The iron abundance of Upsilon Andromedae is +0.08 (120.2% of the Sun). It is moving through the Galaxy at a speed of 39.3 km/s relative to the Sun. Its projected Galactic orbit carries it between 18,600 and 28,300 light years from the center of the Galaxy. It will come closest to the Sun 245,000 years from now when it will brighten to magnitude 3.27 from a distance of 30 light years. Upsilon Andromedae has three confirmed planets know to date (early 2012).
Sky position: RA 1h 36.8m, Dec +41° 24.6'
Common designations: Upsilon Andromedae, 50 Andromedae, HIP 7513, HD 9826, Gliese 61
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Brightest stars in Andromeda:
(list all)
| Rank | Mag. | Star |
| 1 | 2.07 | Alpheratz |
| 2 | 2.07 | Mirach |
| 3 | 2.10 | Almach |
| 4 | 3.27 | Delta Andromedae |
| 5 | 3.59 | 51 Andromedae |
| 6 | 3.62 | Omicron Andromedae |
| 7 | 3.81 | Lambda Andromedae |
| 8 | 3.86 | Mu Andromedae |
| 9 | 4.08 | Zeta Andromedae |
10
| 4.10
) Upsilon Andromedae
| Rank | Mag. | Star |
| 11 | 4.15 | Kappa Andromedae |
| 12 | 4.26 | Phi Andromedae |
| 13 | 4.29 | Iota Andromedae |
| 14 | 4.34 | Pi Andromedae |
| 15 | 4.34 | Epsilon Andromedae |
| 16 | 4.40 | Eta Andromedae |
| 17 | 4.51 | Sigma Andromedae |
Hover over other bright stars to identify or click to jump.
Galactic Orbit of Upsilon Andromedae
(compared to the Sun)
E
ccentricity: 20.7% vs. 16.0%Angle φ : 110.3°vs. 26.0°
Semi-major axis : 7,184 pc vs. 8,686 pc
Semi-minor axis: 7,029 pc vs. 8,574 pc
Focus-to-center
: 1,486 pcvs. 1,388 pcSemilatus rectum : 6,877 pc vs. 8,464 pc
Perigalacticon: 5,698 pc vs. 7,297 pc
Apogalacticon
: 8,670 pcvs. 10,074 pcSome Tabulated XHIP Data for Upsilon Andromedae
(see also: SIMBAD)
Astrometry
2007A&A...474..653V
| Position | Proper Motion | |
| Right Ascension: | 24.19990403° ±0.17 mas | -173.33 ±0.20 mas/yr. |
| Declination: | 41.40638473° ±0.12 mas | -381.80 ±0.13 mas/yr. |
| Galactic Longitude: | 132.00115089° | -98.86 mas/yr. |
| Galactic Latitude: | -20.66516848° | -407.48 mas/yr. |
Parallax: 74.12 ± 0.19 mas
Spectrography
Spectral Type: F9V 2009ApJS..180..117A.
Radial Velocity:
-28.67 ±0.10 km/s [A rating]
2002ApJS..141..503N, 2005ApJS..159..141V.
This star is a spectroscopic binary with a solved orbit.
Iron Abundance [Fe/H]:
0.08 ±0.00 dex
2011A&A...530A.138C, 2011A&A...525A..71W, 2007A&A...465..271R, 2006ApJ...652.1604B, 2006AJ....131.3069L, 2005PASJ...57...27T, 2005MNRAS.363...71H, 2005ApJS..161..444T, 2005ApJS..159..141V, 2005AJ....129.1063L, 2004A&A...420..183A, 2004A&A...418..551M, 2004A&A...415.1153S, 2003AJ....126.2015H, 2003A&A...398..363S, 1998A&A...338..623M, 1998A&A...336..942F, 1996A&A...314..191G, 1993A&A...275..101E, 1990ApJ...354..310B.
Photometry
| band | magnitude | Abs. Mag. |
| U | ||
| B | 4.64 | 3.99 |
| V | 4.10 | 3.45 |
| R | 3.80 | 3.15 |
| I | 3.50 | 2.85 |
| J | 3.18 | 2.52 |
| H | 2.96 | 2.31 |
| K | 2.86 | 2.21 |
B-V: +0.54 V-I: +0.60
Derivations
Heliocentric distance: 13.49 pc (0.3% margin of error)
Galactocentric distance: 7,408 pc
Transverse velocity: 26.8 km/s
3D heliocentric position and motion:
|
toward: |
Galactic center | Galactic rotation | North Galactic Pole |
| Position ( X, Y, Z) | -8.4 pc | 9.4 pc | -4.8 pc |
| Velocity (U, V, W) | 28.8 km/s | -22.5 km/s | -14.3 km/s |