13239+5456 PEA 1 Aa,Ab
13h 23m 55.42s +54° 55' 31.5" P.A. 34.00 sep 0.0 mag 3.00,3.00 Sp A1VpSrSi dist. 26.31 pc (85.82 l.y.)
Coord 2000 |
13239+5456 |
|
Discov num |
PEA 1 |
|
Comp |
Aa,Ab |
|
Coord arcsec 2000 |
13 23 55.42 +54 55 31.5 |
|
Date first |
1925 |
|
Date last |
2004 |
|
Obs |
63 |
|
Pa first |
247 |
|
Pa last |
33.7 |
|
P.A. Now (θ) |
33.7° |
|
Sep first |
0.0 |
|
Sep last |
0.008 |
|
Sep. Now (ρ) |
0.008" |
|
Mag pri |
3.00 |
|
Mag sec |
3.00 |
|
delta mag (ΔM) |
0 |
|
Spectral class |
A1VpSrSi (white) |
|
Pri motion ra |
+122 |
|
Sec motion ra |
|
|
Pri motion dec |
-020 |
|
Sec motion dec |
|
|
Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
13239+5456 SYSTEM COMPONENTS
Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
Show |
|
28737 |
13 23 55 +54 55 32 |
PEA 1 Aa,Ab |
2004 |
63 |
34 |
0.0 |
3.00 |
3.00 |
0.00 |
Y |
<=== |
Show |
Mizar |
28737 |
13 23 55 +54 55 32 |
STF 1744 AB |
2020 |
500 |
154 |
14.7 |
2.23 |
3.88 |
1.65 |
|
|
Show |
|
28737 |
13 23 55 +54 55 32 |
STF 1744 AC |
2020 |
15 |
73 |
715.5 |
2.23 |
4.01 |
1.78 |
|
|
Show |
|
28737 |
13 23 55 +54 55 32 |
SMR 4 AD |
2020 |
11 |
103 |
498.1 |
2.23 |
7.62 |
5.39 |
|
|
Show |
|
28737 |
13 23 55 +54 55 32 |
SHY 247 AE |
1999 |
3 |
321 |
999.9 |
2.23 |
6.88 |
4.65 |
|
|
Show |
|
28737 |
13 23 55 +54 55 32 |
SHY 247 AF |
1999 |
3 |
359 |
999.9 |
2.23 |
9.86 |
7.63 |
|
|
Show |
Alcor |
28751 |
13 25 14 +54 59 17 |
PSF 1 Ca,Cb |
2009 |
5 |
207 |
1.0 |
4.01 |
8.00 |
3.99 |
|
|
Show |
Alcor |
28751 |
13 25 14 +54 59 17 |
SHY 248 CE |
1999 |
3 |
317 |
999.9 |
4.01 |
6.88 |
2.87 |
|
|
Show |
Alcor |
28751 |
13 25 14 +54 59 17 |
SHY 248 CF |
1999 |
3 |
355 |
999.9 |
4.01 |
9.86 |
5.85 |
|
|
Show |
Alcor |
28751 |
13 25 14 +54 59 17 |
SHY 248 CG |
1999 |
3 |
271 |
999.9 |
4.01 |
8.21 |
4.20 |
|
|
Show |
Alcor |
28751 |
13 25 14 +54 59 17 |
SHY 248 CH |
1999 |
3 |
243 |
999.9 |
4.01 |
8.63 |
4.62 |
|
|
Decuple system
8 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
Common name |
Mizar |
|
Var name |
NSV6224 UMa |
|
Constellation |
Ursa Major |
|
SAO |
28737 |
|
HIP |
65378 |
|
Tycho2 |
3850-01385-1 |
|
Gaia DR2 |
1563590579345330944 |
|
HD |
116656 |
|
HR |
5054 |
|
GC |
18133 |
|
ADS |
8891 |
|
GL |
NN 3783A |
|
BD |
BD+55 1598 |
|
Bayer |
Zeta Ursae Majoris |
|
Bayer name |
Zet UMa |
|
Flamsteed |
79 Ursae Majoris |
|
Flamsteed name |
79 UMa |
|
FK5 |
497 |
|
Distance |
26.31 |
|
Distance ly |
85.82 |
|
Bayer greek |
ζ UMa |
|
Other names |
Mizat, Mirza, Mitsar |
|
ORBITAL ELEMENTS SOLUTION #1
Period (P) | 20.53835d | ± 0.00005 |
Periastron (T) | 47636.07d (1989.299y) | ± 0.02 |
Semi-major axis (a) | 9.83m | ± 0.03 |
Eccentricity (e) | 0.5354 | ± 0.0025 |
Inclination (i) | 60.5° | ± 0.3 |
Longitude of periastron (ω) | 104.3° | ± 0.3 |
Node (Ω) | 106° | ± 0.4 |
Notes | n | |
Reference | MkT1998 | |
Equinox | 2000 | |
Last observation | 1997 | |
Grade | 2 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000-01-01 |
349.7 |
0.007 |
2001-01-01 |
291.8 |
0.007 |
2002-01-01 |
102.5 |
0.009 |
2003-01-01 |
70.5 |
0.010 |
2004-01-01 |
27.5 |
0.007 |
2005-01-01 |
326.9 |
0.007 |
2006-01-01 |
225.7 |
0.002 |
2007-01-01 |
89.3 |
0.010 |
2008-01-01 |
56.9 |
0.009 |
2009-01-01 |
4.4 |
0.007 |
2010-01-01 |
306.0 |
0.008 |
2011-01-01 |
115.2 |
0.007 |
2012-01-01 |
77.9 |
0.010 |
2013-01-01 |
40.0 |
0.008 |
2014-01-01 |
340.6 |
0.007 |
2015-01-01 |
279.6 |
0.006 |
2016-01-01 |
96.9 |
0.009 |
2017-01-01 |
65.6 |
0.010 |
2018-01-01 |
18.9 |
0.007 |
2019-01-01 |
318.8 |
0.008 |
2020-01-01 |
150.2 |
0.003 |
2021-01-01 |
84.8 |
0.010 |
2022-01-01 |
50.8 |
0.009 |
2023-01-01 |
355.1 |
0.007 |
2024-01-01 |
297.4 |
0.007 |
2025-01-01 |
106.4 |
0.008 |
2026-01-01 |
73.3 |
0.010 |
2027-01-01 |
32.3 |
0.008 |
2028-01-01 |
331.9 |
0.007 |
2029-01-01 |
256.8 |
0.004 |
2030-01-01 |
92.0 |
0.010 |
|
|

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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ORBITAL ELEMENTS SOLUTION #2
Period (P) | 36.5y | ± 2 |
Periastron (T) | 1994.8y | ± 1 |
Semi-major axis (a) | 0.78a | ± 0.03 |
Eccentricity (e) | 0.6 | ± 0.2 |
Inclination (i) | 93° | ± 7 |
Longitude of periastron (ω) | 287° | ± 14 |
Node (Ω) | 32° | ± 10 |
Notes | n | |
Reference | Gon2010 | |
Equinox | | |
Last observation | | |
Grade | 9 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
28.4 |
0.477 |
2001 |
27.2 |
0.437 |
2002 |
25.7 |
0.387 |
2003 |
23.8 |
0.330 |
2004 |
20.9 |
0.268 |
2005 |
16.3 |
0.203 |
2006 |
7.3 |
0.138 |
2007 |
344.3 |
0.081 |
2008 |
286.6 |
0.064 |
2009 |
247.4 |
0.108 |
2010 |
233.8 |
0.171 |
2011 |
227.6 |
0.237 |
2012 |
224.1 |
0.303 |
2013 |
221.8 |
0.367 |
2014 |
220.2 |
0.429 |
2015 |
219.0 |
0.488 |
2016 |
218.1 |
0.544 |
2017 |
217.3 |
0.595 |
2018 |
216.6 |
0.642 |
2019 |
216.1 |
0.684 |
2020 |
215.6 |
0.719 |
2021 |
215.1 |
0.747 |
2022 |
214.7 |
0.766 |
2023 |
214.2 |
0.776 |
2024 |
213.8 |
0.773 |
2025 |
213.4 |
0.755 |
2026 |
212.9 |
0.719 |
2027 |
212.4 |
0.659 |
2028 |
211.7 |
0.567 |
2029 |
210.7 |
0.432 |
2030 |
208.4 |
0.238 |
|
|

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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