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Doubles in session


Current system
13239+5456
PEA 1 Aa,Ab


Nearby doubles
44' : 13273+5528
UC 2542

48' : 13205+5419
BEM9017

50' : 13195+5423
STI2296

60' : 13184+5420
HJ 2649

62' : 13219+5554
CBL 56

69' : 13198+5358
CBL 420

71' : 13198+5557
TDS 701

73' : 13275+5601
A 1361AB

79' : 13157+5424
HDS1858

79' : 13279+5345
TDS8835

89' : 13312+5354
CVR 699

90' : 13291+5614
A 1362

90' : 13146+5417
A 1608

94' : 13337+5418
BEM 6

98' : 13213+5321
ES 733

100' : 13200+5322
SLW 855

103' : 13138+5550
CVR1496

104' : 13119+5445
SKF1742

114' : 13109+5439
CBL 412

115' : 13254+5649
HJ 2652

118' : 13276+5721
VBS 22

119' : 13146+5330
LDS5221

121' : 13099+5504
GRV1155

123' : 13098+5448
TDS8712

124' : 13258+5658
LAF 49

126' : 13383+5519
MLB 171



Selections
Full WDS
Binocular doubles
Binary Systems
Triple Systems
Quadruple Systems
Multiple Systems
Neglected List I
Neglected List II
Observed
Herschel, W.
Herschel, J.F.W.
Struve, Otto
Struve, F.G.W.

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
Meaning bandage (thong)
 
 
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 Notesn ReferenceMkT1998
Equinox2000 Last observation1997 Grade2(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


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


 
  


wds13239%2B5456a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic		  
 
 
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 Notesn ReferenceGon2010
Equinox Last observation Grade9(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


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


 
  


wds13239%2B5456r.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic