11182+3132 STF 1523 AB (Alula Australis)

 
 
11h 18m 10.90s +31 31' 45.0" P.A. 152.00 sep 2.3 mag 4.33,4.80 Sp F9V+G9V dist. 10.42 pc (33.99 l.y.)
 
 
Coord 2000 11182+3132 Discov num STF1523 Comp AB Coord arcsec 2000 11 18 10.90 +31 31 45.0
Date first 1819 Date last 2020 Obs 1664
Pa first 285 Pa last 151.5 P.A. Now (θ) 142.1°
Sep first 2.6 Sep last 2.31 Sep. Now (ρ) 2.423"
Mag pri 4.33 Mag sec 4.80 delta mag (ΔM) 0.47 Spectral class F9V+G9V (yellow-white/yellow)
Pri motion ra -454 Sec motion ra -454
Pri motion dec -591 Sec motion dec -591
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
11182+3132 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show Alula Australis 62484 11 18 11 +31 31 45 STF 1523 AB 2020 1664 152 2.3 4.33 4.80 0.47 Y <===
Show 62484 11 18 11 +31 31 45 POP 1219 AC 2015 5 331 59.7 4.33 15.00 10.67
Show 62484 11 18 11 +31 31 45 WTE 1 AD 2012 15 136 511.4 2.14 18.75 16.61
Show 62484 11 18 11 +31 31 46 CHR 178 Ba,Bb 1994 2 75 0.0 4.40
Quintuple system
4 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Common name Alula Australis Var name NSV5165 UMa Constellation Ursa Major SAO 62484
HIP 55203 Tycho2 2520-02634-1 HD 98231 HR 4375
GC 15537 ADS 8119 GL Gl 423A BD BD+32 2132
Bayer Xi Ursae Majoris Bayer name Xi UMa Flamsteed 53 Ursae Majoris Flamsteed name 53 UMa
Distance 10.42 Distance ly 33.99 Bayer greek ξ UMa
Meaning first (leap gazelle), South
 
 
ORBITAL ELEMENTS
 
 
Period (P)59.8903y± 0.0419 Periastron (T)1935.17y± 0.0473 Semi-major axis (a)2.50442a± 0.00535
Eccentricity (e)0.40432± 0.00204 Inclination (i)122.187°± 0.192 Longitude of periastron (ω)126.964°± 0.343
Node (Ω)100.939°± 0.202 Notesn ReferenceIzm2019
Equinox Last observation2015 Grade1(1=Definitive, 9=Indet.)
label theta rho
2000 273.5 1.770
2001 267.8 1.803
2002 262.1 1.809
2003 256.5 1.795
2004 250.7 1.767
2005 244.7 1.732
2006 238.4 1.694
2007 231.9 1.658
2008 225.1 1.629
2009 218.1 1.608
2010 210.9 1.599
2011 203.8 1.604
2012 196.7 1.622
2013 189.8 1.655
2014 183.3 1.701
2015 177.1 1.758
2016 171.4 1.825
2017 166.1 1.901
2018 161.2 1.982
2019 156.8 2.068
2020 152.6 2.156
2021 148.8 2.246
2022 145.3 2.335
2023 142.1 2.423
2024 139.1 2.509
2025 136.2 2.591
2026 133.6 2.668
2027 131.1 2.741
2028 128.7 2.807
2029 126.4 2.867
2030 124.2 2.919


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



 
 


wds11182%2B3132b.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic
 
 
 
SUSPECTED ORBITAL ELEMENTS
 
 
Identifier11182+3132 STF1523 A
coord_arcsec_2000111810.90+313144.9
Period (P)1.834y Periastron (T)1992.29y Semi-major axis (a)0.054a
Eccentricity (e)0.61 Inclination (i)91° Longitude of periastron (ω)324°
Node (Ω)318° Notesn ReferenceHei1996b
Equinox Last observation Grade9(1=Definitive, 9=Indet.)
label theta rho
2000 142.0 0.015
2001 138.1 0.070
2002 139.8 0.037
2003 137.7 0.054
2004 139.2 0.055
2005 136.7 0.021
2006 138.8 0.068
2007 318.0 0.023
2008 138.5 0.075
2009 313.6 0.010
2010 138.3 0.077
2011 142.2 0.015
2012 138.1 0.071
2013 139.8 0.037
2014 137.8 0.054
2015 139.2 0.054
2016 136.7 0.022
2017 138.8 0.067
2018 318.0 0.022
2019 138.6 0.075
2020 313.9 0.010
2021 138.3 0.077
2022 142.3 0.014
2023 138.1 0.071
2024 139.8 0.036
2025 137.8 0.055
2026 139.2 0.054
2027 136.8 0.023
2028 138.8 0.067
2029 318.1 0.022
2030 138.6 0.075


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



 
 


wds11182%2B3132t.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic