61 Ursae Majoris, a yellow main-sequence star in Ursa Major
61 Ursae Majoris is a yellow main-sequence star in the constellation Ursa Major. At 31 light years away, it shines at an apparent visual magnitude of 5.31.
61 Ursae Majoris (HIP 56997)
61 Ursae Majoris is a yellow main-sequence star in the constellation Ursa Major. At 31 light years away, it shines at an apparent visual magnitude of 5.31. 61 Ursae Majoris is the primary component of a multiple-star system. The star's age is estimated to be 900 million years but is certainly no greater than 9.8 billion years. The iron abundance of 61 Ursae Majoris is -0.03 (93.3% of the Sun). It is moving through the Galaxy at a speed of 18.2 km/s relative to the Sun. Its projected Galactic orbit carries it between 21,600 and 26,500 light years from the center of the Galaxy.
Sky position: RA 11h 41.1m, Dec +34° 12'
Common designations: 61 Ursae Majoris, HIP 56997, HD 101501, Gliese 434
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Brightest stars in Ursa Major:
(list all)
| Rank | Mag. | Star |
| 46 | 5.15 | 27 Ursae Majoris |
| 47 | 5.16 | 37 Ursae Majoris |
| 48 | 5.18 | 16 Ursae Majoris |
| 49 | 5.18 | HD 92787 |
| 50 | 5.22 | 67 Ursae Majoris |
| 51 | 5.27 | 31 Ursae Majoris |
| 52 | 5.27 | HR 4521 |
| 53 | 5.28 | 17 Ursae Majoris |
| 54 | 5.30 | 57 Ursae Majoris |
55
| 5.31
) 61 Ursae Majoris
| Rank | Mag. | Star |
| 56 | 5.34 | 55 Camelopardalis |
| 57 | 5.37 | 74 Ursae Majoris |
| 58 | 5.40 | 41 Lyncis |
| 59 | 5.40 | HR 5085 |
| 60 | 5.46 | HD 100203 |
| 61 | 5.46 | 82 Ursae Majoris |
| 62 | 5.47 | A Ursae Majoris |
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Galactic Orbit of 61 Ursae Majoris
(compared to the Sun)
E
ccentricity: 10.3% vs. 16.0%Angle φ : 97.5°vs. 26.0°
Semi-major axis : 7,381 pc vs. 8,686 pc
Semi-minor axis: 7,342 pc vs. 8,574 pc
Focus-to-center
: 761 pcvs. 1,388 pcSemilatus rectum : 7,303 pc vs. 8,464 pc
Perigalacticon: 6,620 pc vs. 7,297 pc
Apogalacticon
: 8,142 pcvs. 10,074 pcSome Tabulated XHIP Data for 61 Ursae Majoris
(see also: SIMBAD)
Astrometry
2007A&A...474..653V
| Position | Proper Motion | |
| Right Ascension: | 175.26260504° ±0.22 mas | -12.57 ±0.24 mas/yr. |
| Declination: | 34.20255998° ±0.20 mas | -380.74 ±0.20 mas/yr. |
| Galactic Longitude: | 183.54644661° | 361.37 mas/yr. |
| Galactic Latitude: | 73.32433824° | 120.56 mas/yr. |
Parallax: 104.04 ± 0.26 mas
Spectrography
Spectral Type: G8V 2003AJ....126.2048G.
Radial Velocity: -5.56 ±0.10 km/s [A rating] 2002ApJS..141..503N, 2005ApJS..159..141V.
Iron Abundance [Fe/H]:
-0.03 dex
2011A&A...525A..71W, 2009A&A...508L..17R, 2009A&A...501..941H, 2008MNRAS.384..173F, 2008A&A...480...91S, 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.
Photometry
| band | magnitude | Abs. Mag. |
| U | ||
| B | 6.03 | 6.12 |
| V | 5.31 | 5.40 |
| R | 4.90 | 4.99 |
| I | 4.50 | 4.59 |
| J | 3.99 | 4.07 |
| H | 3.65 | 3.73 |
| K | 3.59 | 3.67 |
B-V: +0.72 V-I: +0.81
Derivations
Heliocentric distance: 9.61 pc (0.2% margin of error)
Galactocentric distance: 7,403 pc
Transverse velocity: 17.4 km/s
3D heliocentric position and motion:
|
toward: |
Galactic center | Galactic rotation | North Galactic Pole |
| Position ( X, Y, Z) | -2.8 pc | -0.2 pc | 9.2 pc |
| Velocity (U, V, W) | 7.9 km/s | -16.0 km/s | -3.7 km/s |