11374+4728 KU 39 (DF UMa)
11h 37m 24.61s +47° 27' 44.8" P.A. 144.00 sep 1.2 mag 10.68,11.16 Sp K4V dist. 31.3 pc (102.1 l.y.)
Coord 2000 |
11374+4728 |
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Discov num |
KU 39 |
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Comp |
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Coord arcsec 2000 |
11 37 24.61 +47 27 44.8 |
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Date first |
1901 |
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Date last |
2017 |
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Obs |
52 |
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Pa first |
22 |
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Pa last |
144.1 |
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P.A. Now (θ) |
144.1° |
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Sep first |
2.5 |
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Sep last |
1.15 |
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Sep. Now (ρ) |
1.15" |
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Mag pri |
10.68 |
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Mag sec |
11.16 |
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delta mag (ΔM) |
0.48 |
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Spectral class |
K4V (yellow-orange) |
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Pri motion ra |
+098 |
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Sec motion ra |
+098 |
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Pri motion dec |
-024 |
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Sec motion dec |
-024 |
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Notes |
N
O
(See Notes, Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
Var name |
DF UMa |
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Constellation |
Ursa Major |
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HIP |
56685 |
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Tycho2 |
3451-00540-1 |
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ADS |
8242 |
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BD |
BD+48 1958 |
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Distance |
31.3 |
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Distance ly |
102.1 |
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ORBITAL ELEMENTS
Period (P) | 278.8y | |
Periastron (T) | 1743.8y | |
Semi-major axis (a) | 2.14a | |
Eccentricity (e) | 0.65 | |
Inclination (i) | 50.1° | |
Longitude of periastron (ω) | 62.5° | |
Node (Ω) | 142.8° | |
Notes | n | |
Reference | WSI2006b | |
Equinox | 2000 | |
Last observation | 2005 | |
Grade | 5 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
112.2 |
1.272 |
2001 |
114.0 |
1.256 |
2002 |
115.9 |
1.239 |
2003 |
117.8 |
1.221 |
2004 |
119.7 |
1.202 |
2005 |
121.8 |
1.182 |
2006 |
123.9 |
1.160 |
2007 |
126.1 |
1.138 |
2008 |
128.3 |
1.114 |
2009 |
130.7 |
1.088 |
2010 |
133.2 |
1.060 |
2011 |
135.8 |
1.030 |
2012 |
138.6 |
0.998 |
2013 |
141.6 |
0.964 |
2014 |
144.9 |
0.927 |
2015 |
148.4 |
0.887 |
2016 |
152.2 |
0.845 |
2017 |
156.5 |
0.801 |
2018 |
161.2 |
0.754 |
2019 |
166.6 |
0.707 |
2020 |
172.8 |
0.659 |
2021 |
180.0 |
0.613 |
2022 |
188.2 |
0.571 |
2023 |
197.7 |
0.536 |
2024 |
208.2 |
0.511 |
2025 |
219.6 |
0.499 |
2026 |
231.2 |
0.501 |
2027 |
242.3 |
0.519 |
2028 |
252.5 |
0.549 |
2029 |
261.4 |
0.590 |
2030 |
269.1 |
0.638 |
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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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