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) |
316.1° |
|
| Sep first |
0.9 |
|
Sep last |
0.806 |
|
Sep. Now (ρ) |
0.814" |
|
| 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) | 44.199y | ± 0.278 |
Periastron (T) | 1913.888y | ± 0.554 |
Semi-major axis (a) | 0.593a | ± 0.004 |
| Eccentricity (e) | 0.433 | ± 0.004 |
Inclination (i) | 167.155° | ± 2.249 |
Longitude of periastron (ω) | 51.525° | ± 9.59 |
| Node (Ω) | 185.901° | ± 9.25 |
Notes | n | |
Reference | JAA2023 | |
| Equinox | | |
Last observation | | |
Grade | 2 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
182.9 |
0.374 |
| 2001 |
163.5 |
0.348 |
| 2002 |
141.6 |
0.333 |
| 2003 |
118.7 |
0.333 |
| 2004 |
96.9 |
0.350 |
| 2005 |
77.9 |
0.379 |
| 2006 |
61.9 |
0.417 |
| 2007 |
48.7 |
0.459 |
| 2008 |
37.8 |
0.501 |
| 2009 |
28.5 |
0.542 |
| 2010 |
20.5 |
0.581 |
| 2011 |
13.5 |
0.618 |
| 2012 |
7.3 |
0.652 |
| 2013 |
1.6 |
0.683 |
| 2014 |
356.5 |
0.711 |
| 2015 |
351.6 |
0.736 |
| 2016 |
347.1 |
0.758 |
| 2017 |
342.9 |
0.777 |
| 2018 |
338.8 |
0.794 |
| 2019 |
334.9 |
0.807 |
| 2020 |
331.0 |
0.818 |
| 2021 |
327.3 |
0.827 |
| 2022 |
323.7 |
0.833 |
| 2023 |
320.1 |
0.836 |
| 2024 |
316.5 |
0.837 |
| 2025 |
312.9 |
0.836 |
| 2026 |
309.3 |
0.832 |
| 2027 |
305.6 |
0.825 |
| 2028 |
301.8 |
0.816 |
| 2029 |
298.0 |
0.805 |
| 2030 |
294.1 |
0.791 |
| 2031 |
290.0 |
0.775 |
| 2032 |
285.7 |
0.757 |
| 2033 |
281.2 |
0.736 |
| 2034 |
276.4 |
0.713 |
| 2035 |
271.2 |
0.687 |
| 2036 |
265.7 |
0.660 |
| 2037 |
259.6 |
0.630 |
| 2038 |
252.9 |
0.597 |
| 2039 |
245.5 |
0.563 |
| 2040 |
237.0 |
0.527 |
| 2041 |
227.2 |
0.490 |
| 2042 |
215.9 |
0.452 |
| 2043 |
202.4 |
0.415 |
| 2044 |
186.5 |
0.381 |
| 2045 |
167.6 |
0.352 |
| 2046 |
146.1 |
0.335 |
| 2047 |
123.3 |
0.332 |
| 2048 |
101.1 |
0.345 |
| 2049 |
81.4 |
0.373 |
| 2050 |
64.8 |
0.409 |
|
|
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
Measures: green=micrometric, blue=interferometric, purple=photographic
|
|
