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 |
Notes | n | |
Reference | Izm2019 | |
| Equinox | | |
Last observation | 2015 | |
Grade | 1 | (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 |
| 2031 |
122.1 |
2.963 |
| 2032 |
120.0 |
2.998 |
| 2033 |
118.0 |
3.023 |
| 2034 |
116.0 |
3.038 |
| 2035 |
114.0 |
3.042 |
| 2036 |
112.0 |
3.034 |
| 2037 |
110.0 |
3.014 |
| 2038 |
108.0 |
2.979 |
| 2039 |
105.9 |
2.930 |
| 2040 |
103.7 |
2.866 |
| 2041 |
101.4 |
2.785 |
| 2042 |
98.9 |
2.687 |
| 2043 |
96.3 |
2.570 |
| 2044 |
93.3 |
2.433 |
| 2045 |
90.0 |
2.277 |
| 2046 |
86.2 |
2.100 |
| 2047 |
81.6 |
1.903 |
| 2048 |
75.9 |
1.687 |
| 2049 |
68.4 |
1.460 |
| 2050 |
58.2 |
1.230 |
|
|
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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