11520+4805 HU 731 (MY UMa)
11h 51m 57.86s +48° 05' 19.5" P.A. 305.00 sep 1.3 mag 9.81,9.68 Sp K0V dist. 46.1 pc (150.38 l.y.)
Coord 2000 |
11520+4805 |
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Discov num |
HU 731 |
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Comp |
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Coord arcsec 2000 |
11 51 57.86 +48 05 19.5 |
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Date first |
1902 |
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Date last |
2019 |
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Obs |
63 |
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Pa first |
296 |
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Pa last |
304.8 |
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P.A. Now (θ) |
304.8° |
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Sep first |
0.3 |
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Sep last |
1.26 |
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Sep. Now (ρ) |
1.26" |
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Mag pri |
9.81 |
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Mag sec |
9.68 |
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delta mag (ΔM) |
0.13 |
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Spectral class |
K0V (yellow-orange) |
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Pri motion ra |
-217 |
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Sec motion ra |
-217 |
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Pri motion dec |
+047 |
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Sec motion dec |
+047 |
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Notes |
O
(Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
Var name |
MY UMa |
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Constellation |
Ursa Major |
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HIP |
57859 |
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Tycho2 |
3452-01353-1 |
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Gaia DR2 |
786765410803908096 |
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ADS |
8325 |
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BD |
BD+48 1978 |
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Distance |
46.1 |
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Distance ly |
150.38 |
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ORBITAL ELEMENTS
Period (P) | 207.77y | ± 38.24 |
Periastron (T) | 1900.83y | ± 2 |
Semi-major axis (a) | 1.179a | ± 0.046 |
Eccentricity (e) | 0.705 | ± 0.033 |
Inclination (i) | 96.6° | ± 1 |
Longitude of periastron (ω) | 301.1° | ± 7.8 |
Node (Ω) | 118.7° | ± 1.9 |
Notes | | |
Reference | Hrt2008 | |
Equinox | 2000 | |
Last observation | 2003 | |
Grade | 5 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
310.4 |
0.997 |
2001 |
310.2 |
1.010 |
2002 |
310.0 |
1.023 |
2003 |
309.8 |
1.036 |
2004 |
309.6 |
1.048 |
2005 |
309.4 |
1.061 |
2006 |
309.3 |
1.073 |
2007 |
309.1 |
1.085 |
2008 |
308.9 |
1.096 |
2009 |
308.8 |
1.108 |
2010 |
308.6 |
1.119 |
2011 |
308.5 |
1.131 |
2012 |
308.3 |
1.142 |
2013 |
308.2 |
1.152 |
2014 |
308.0 |
1.163 |
2015 |
307.9 |
1.173 |
2016 |
307.7 |
1.183 |
2017 |
307.6 |
1.193 |
2018 |
307.4 |
1.203 |
2019 |
307.3 |
1.213 |
2020 |
307.2 |
1.222 |
2021 |
307.0 |
1.231 |
2022 |
306.9 |
1.240 |
2023 |
306.8 |
1.248 |
2024 |
306.7 |
1.257 |
2025 |
306.5 |
1.265 |
2026 |
306.4 |
1.273 |
2027 |
306.3 |
1.280 |
2028 |
306.2 |
1.288 |
2029 |
306.1 |
1.295 |
2030 |
305.9 |
1.301 |
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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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