Upsilon Leonis, an orange giant star in Leo
Upsilon Leonis is an orange giant star in the constellation Leo. At 181 light years away, it shines at an apparent visual magnitude of 4.3.
Upsilon Leonis (HIP 56647)
Upsilon Leonis is an orange giant star in the constellation Leo. At 181 light years away, it shines at an apparent visual magnitude of 4.30. The iron abundance of Upsilon Leonis is -0.18 (66.1% of the Sun). It is moving through the Galaxy at a speed of 11.6 km/s relative to the Sun. Its projected Galactic orbit carries it between 24,000 and 38,500 light years from the center of the Galaxy.
Sky position: RA 11h 36.9m, Dec -0° 49.2'
Common designations: Upsilon Leonis, 91 Leonis, HIP 56647, HD 100920
Brightest stars in Leo:
(list all)
| Rank | Mag. | Star |
| 6 | 3.33 | Chertan |
| 7 | 3.43 | Adhafera |
| 8 | 3.48 | Al'dzhabkhakh |
| 9 | 3.52 | Subra |
| 10 | 3.84 | Rho Leonis |
| 11 | 3.88 | Ras Elased Borealis |
| 12 | 4.00 | Iota Leonis |
| 13 | 4.05 | Sigma Leonis |
| 14 | 4.30 | 54 Leonis |
15
| 4.30
) Upsilon Leonis
| Rank | Mag. | Star |
| 16 | 4.32 | Alterf |
| 17 | 4.39 | A Leonis |
| 18 | 4.42 | 60 Leonis |
| 19 | 4.45 | Phi Leonis |
| 20 | 4.47 | Al Minliar al Asad |
| 21 | 4.50 | 93 Leonis |
| 22 | 4.56 | 72 Leonis |
Hover over other bright stars to identify or click to jump.
Galactic Orbit of Upsilon Leonis
(compared to the Sun)
E
ccentricity: 23.2% vs. 16.0%Angle φ : 12.4°vs. 26.0°
Semi-major axis : 9,594 pc vs. 8,686 pc
Semi-minor axis: 9,333 pc vs. 8,574 pc
Focus-to-center
: 2,225 pcvs. 1,388 pcSemilatus rectum : 9,078 pc vs. 8,464 pc
Perigalacticon: 7,369 pc vs. 7,297 pc
Apogalacticon
: 11,820 pcvs. 10,074 pcSome Tabulated XHIP Data for Upsilon Leonis
(see also: SIMBAD)
Astrometry
2007A&A...474..653V
| Position | Proper Motion | |
| Right Ascension: | 174.23720763° ±0.19 mas | 1.77 ±0.18 mas/yr. |
| Declination: | -0.82385439° ±0.15 mas | 43.40 ±0.14 mas/yr. |
| Galactic Longitude: | 267.26347849° | -21.01 mas/yr. |
| Galactic Latitude: | 56.79836054° | 38.02 mas/yr. |
Parallax: 17.97 ± 0.22 mas
Spectrography
Spectral Type: K0 III 1999MSS...C05....0H.
Radial Velocity: 1.70 ±0.60 km/s [A rating] 2006AstL...32..759G.
Iron Abundance [Fe/H]:
-0.18 ±0.03 dex
2011A&A...525A..71W, 2008A&A...484L..21M, 2007A&A...475.1003H, 1990ApJS...74.1075M.
Photometry
| band | magnitude | Abs. Mag. |
| U | ||
| B | 5.28 | 1.56 |
| V | 4.30 | 0.57 |
| R | ||
| I | 3.43 | -0.29 |
| J | 2.78 | -0.95 |
| H | 2.27 | -1.46 |
| K | 2.18 | -1.54 |
B-V: +0.98 V-I: +0.87
Derivations
Heliocentric distance: 55.64 pc (1.2% margin of error)
Galactocentric distance: 7,402 pc
Transverse velocity: 11.5 km/s
3D heliocentric position and motion:
|
toward: |
Galactic center | Galactic rotation | North Galactic Pole |
| Position ( X, Y, Z) | -1.5 pc | -30.4 pc | 46.6 pc |
| Velocity (U, V, W) | -5.2 km/s | 7.7 km/s | 6.9 km/s |