11037+6145 BU 1077AB (Dubhe)

 
 
11H 03M 43.84S +61 45' 04.0" P.A. 345.4 SEP 0.77 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
2014
Obs
79
Pa first
326
Pa last
355
P.A. Now (θ)
345.4°
Sep first
0.9
Sep last
0.7
Sep. Now (ρ)
0.77"
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_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show Dubhe 15384 11037+6145 BU 1077 AB 1889 2014 79 345 0.8 2.02 4.95 2.93 Y <===
Show 15384 11037+6145 BU 1077 AC 1800 1999 13 204 380.6 2.02 7.19 5.17
Triple system
3 visible stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Common name
Dubhe
Meaning
Bear
Other names
DUBB, AK
Constellation
Ursa Major
SAO
15384
HIP
54061
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
Distance
37.68
Distance ly
122.91
last precise pa
355.4
last precise sep
0.714
 
 
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 Note Grade3(1=Definitive, 9=Indet.)
Equinox2000 Last observation2010
label rho theta
2000 0.366 183.7
2001 0.338 164.4
2002 0.320 142.2
2003 0.318 118.6
2004 0.335 96.1
2005 0.367 76.6
2006 0.408 60.7
2007 0.453 47.9
2008 0.498 37.3
2009 0.542 28.5
2010 0.582 21.0
2011 0.619 14.4
2012 0.653 8.5
2013 0.683 3.2
2014 0.710 358.3
2015 0.734 353.7
2016 0.754 349.4
2017 0.772 345.4
2018 0.786 341.4
2019 0.798 337.6
2020 0.807 334.0
2021 0.813 330.3
2022 0.817 326.8
2023 0.819 323.2
2024 0.818 319.7
2025 0.814 316.1
2026 0.809 312.5
2027 0.801 308.8
2028 0.791 305.0
2029 0.779 301.2
2030 0.765 297.2

Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.

grafico orbita





grafico misure orbit6
Measures: green=micrometric, blue=interferometric, purple=photographic