09104+6708 STF 1306 AB (Sig2 UMa)
09h 10m 23.53s +67° 08' 03.3" P.A. 346.00 sep 4.4 mag 4.87,8.85 Sp F7V dist. 20.38 pc (66.48 l.y.)
Coord 2000 |
09104+6708 |
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Discov num |
STF1306 |
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Comp |
AB |
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Coord arcsec 2000 |
09 10 23.53 +67 08 03.3 |
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Date first |
1782 |
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Date last |
2020 |
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Obs |
233 |
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Pa first |
283 |
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Pa last |
346.3 |
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P.A. Now (θ) |
346.3° |
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Sep first |
8.0 |
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Sep last |
4.35 |
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Sep. Now (ρ) |
4.35" |
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Mag pri |
4.87 |
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Mag sec |
8.85 |
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delta mag (ΔM) |
3.98 |
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Spectral class |
F7V (yellow-white) |
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Pri motion ra |
+007 |
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Sec motion ra |
+004 |
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Pri motion dec |
-095 |
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Sec motion dec |
-030 |
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Notes |
N
O
(See Notes, Orbital solution) |
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rPM=0.683
This double is physical.
09104+6708 SYSTEM COMPONENTS
Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
Show |
Sig2 UMa |
14788 |
09 10 24 +67 08 03 |
STF 1306 AB |
2020 |
233 |
346 |
4.4 |
4.87 |
8.85 |
3.98 |
Y |
<=== |
Show |
|
14788 |
09 10 24 +67 08 03 |
STF 1306 AC |
2003 |
10 |
148 |
197.8 |
4.87 |
10.32 |
5.45 |
|
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Triple system
3 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
Name |
Sig2 UMa |
|
Var name |
NSV4392 UMa |
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Constellation |
Ursa Major |
|
SAO |
14788 |
|
HIP |
45038 |
|
Tycho2 |
4141-01496-1 |
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Gaia DR2 |
1068982214258617216 |
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HD |
78154 |
|
HR |
3616 |
|
GC |
12619 |
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ADS |
7203 |
|
GL |
Gl 335A |
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BD |
BD+67 577 |
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Bayer |
Sigma 2 Ursae Majoris |
|
Bayer name |
Sig2 UMa |
|
Flamsteed |
13 Ursae Majoris |
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Flamsteed name |
13 UMa |
|
Distance |
20.38 |
|
Distance ly |
66.48 |
|
Bayer greek |
σ2 UMa |
|
ORBITAL ELEMENTS
Period (P) | 920.9005y | ± 90.7281 |
Periastron (T) | 1917.0555y | ± 0.2205 |
Semi-major axis (a) | 5.73856a | ± 0.40385 |
Eccentricity (e) | 0.79257 | ± 0.01527 |
Inclination (i) | 144.031° | ± 1.72 |
Longitude of periastron (ω) | 334.501° | ± 1.122 |
Node (Ω) | 105.205° | ± 1.772 |
Notes | n | |
Reference | Izm2019 | |
Equinox | | |
Last observation | 2015 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
353.5 |
3.884 |
2001 |
353.0 |
3.919 |
2002 |
352.6 |
3.953 |
2003 |
352.2 |
3.987 |
2004 |
351.8 |
4.020 |
2005 |
351.4 |
4.054 |
2006 |
351.1 |
4.088 |
2007 |
350.7 |
4.121 |
2008 |
350.3 |
4.154 |
2009 |
349.9 |
4.187 |
2010 |
349.6 |
4.220 |
2011 |
349.2 |
4.253 |
2012 |
348.9 |
4.286 |
2013 |
348.5 |
4.319 |
2014 |
348.2 |
4.351 |
2015 |
347.9 |
4.384 |
2016 |
347.5 |
4.416 |
2017 |
347.2 |
4.448 |
2018 |
346.9 |
4.480 |
2019 |
346.6 |
4.512 |
2020 |
346.3 |
4.544 |
2021 |
346.0 |
4.576 |
2022 |
345.7 |
4.607 |
2023 |
345.4 |
4.638 |
2024 |
345.1 |
4.670 |
2025 |
344.8 |
4.701 |
2026 |
344.5 |
4.732 |
2027 |
344.2 |
4.763 |
2028 |
343.9 |
4.794 |
2029 |
343.7 |
4.824 |
2030 |
343.4 |
4.855 |
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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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