11037+6145 BU 1077 AB (Dubhe)
11h 03m 43.84s +61° 45' 04.0" P.A. 342.00 sep 0.8 mag 2.02,4.95 Sp G9III dist. 37.68 pc (122.91 l.y.)
| Coord 2000 |
11037+6145 |
|
Discov num |
BU 1077 |
|
Comp |
AB |
|
Coord arcsec 2000 |
11 03 43.84 +61 45 04.0 |
|
| Date first |
1889 |
|
Date last |
2017 |
|
Obs |
83 |
|
| Pa first |
326 |
|
Pa last |
342.3 |
|
P.A. Now (θ) |
323.2° |
|
| Sep first |
0.9 |
|
Sep last |
0.806 |
|
Sep. Now (ρ) |
0.819" |
|
| Mag pri |
2.02 |
|
Mag sec |
4.95 |
|
delta mag (ΔM) |
2.93 |
|
Spectral class |
G9III (yellow) |
|
| Pri motion ra |
-119 |
|
Sec motion ra |
|
|
| Pri motion dec |
-067 |
|
Sec motion dec |
|
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
11037+6145 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
Dubhe |
15384 |
11 03 44 +61 45 04 |
BU 1077 AB |
2017 |
83 |
342 |
0.8 |
2.02 |
4.95 |
2.93 |
Y |
<=== |
| Show |
|
15384 |
11 03 44 +61 45 04 |
BU 1077 AC |
2020 |
15 |
206 |
384.5 |
2.02 |
7.19 |
5.17 |
|
|
Triple system
3 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Common name |
Dubhe |
|
Var name |
NSV5070 UMa |
|
Constellation |
Ursa Major |
|
SAO |
15384 |
|
| HIP |
54061 |
|
Tycho2 |
4146-01274-1 |
|
HD |
95689 |
|
HR |
4301 |
|
| GC |
15185 |
|
ADS |
8035 |
|
BD |
BD+62 1161 |
|
Bayer |
Alpha Ursae Majoris |
|
| Bayer name |
Alp UMa |
|
Flamsteed |
50 Ursae Majoris |
|
Flamsteed name |
50 UMa |
|
FK5 |
417 |
|
| Distance |
37.68 |
|
Distance ly |
122.91 |
|
Bayer greek |
α UMa |
|
ORBITAL ELEMENTS
| Period (P) | 44.448y | ± 0.11 |
Periastron (T) | 2002.17y | ± 0.094 |
Semi-major axis (a) | 0.59a | ± 0.026 |
| Eccentricity (e) | 0.4392 | ± 0.004 |
Inclination (i) | 159.9° | ± 3.5 |
Longitude of periastron (ω) | 232.8° | ± 7.9 |
| Node (Ω) | 9.3° | ± 8.2 |
Notes | n | |
Reference | Sca2011a | |
| Equinox | 2000 | |
Last observation | 2010 | |
Grade | 2 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
183.7 |
0.366 |
| 2001 |
164.4 |
0.338 |
| 2002 |
142.2 |
0.320 |
| 2003 |
118.6 |
0.318 |
| 2004 |
96.1 |
0.335 |
| 2005 |
76.6 |
0.367 |
| 2006 |
60.7 |
0.408 |
| 2007 |
47.9 |
0.453 |
| 2008 |
37.3 |
0.498 |
| 2009 |
28.5 |
0.542 |
| 2010 |
21.0 |
0.582 |
| 2011 |
14.4 |
0.619 |
| 2012 |
8.5 |
0.653 |
| 2013 |
3.2 |
0.683 |
| 2014 |
358.3 |
0.710 |
| 2015 |
353.7 |
0.734 |
| 2016 |
349.4 |
0.754 |
| 2017 |
345.4 |
0.772 |
| 2018 |
341.4 |
0.786 |
| 2019 |
337.6 |
0.798 |
| 2020 |
334.0 |
0.807 |
| 2021 |
330.3 |
0.813 |
| 2022 |
326.8 |
0.817 |
| 2023 |
323.2 |
0.819 |
| 2024 |
319.7 |
0.818 |
| 2025 |
316.1 |
0.814 |
| 2026 |
312.5 |
0.809 |
| 2027 |
308.8 |
0.801 |
| 2028 |
305.0 |
0.791 |
| 2029 |
301.2 |
0.779 |
| 2030 |
297.2 |
0.765 |
| 2031 |
293.0 |
0.748 |
| 2032 |
288.7 |
0.730 |
| 2033 |
284.1 |
0.710 |
| 2034 |
279.2 |
0.687 |
| 2035 |
274.0 |
0.663 |
| 2036 |
268.4 |
0.637 |
| 2037 |
262.3 |
0.610 |
| 2038 |
255.6 |
0.580 |
| 2039 |
248.1 |
0.549 |
| 2040 |
239.7 |
0.517 |
| 2041 |
230.2 |
0.483 |
| 2042 |
219.3 |
0.449 |
| 2043 |
206.5 |
0.414 |
| 2044 |
191.4 |
0.380 |
| 2045 |
173.4 |
0.350 |
| 2046 |
152.5 |
0.326 |
| 2047 |
129.2 |
0.317 |
| 2048 |
105.9 |
0.325 |
| 2049 |
84.9 |
0.351 |
| 2050 |
67.4 |
0.389 |
|
|
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
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Measures: green=micrometric, blue=interferometric, purple=photographic |
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