11425+2355 COU 390 (HD 101728)
11h 42m 30.32s +23° 54' 22.9" P.A. 102.00 sep 0.4 mag 9.27,11.66 Sp G5 dist. 45.72 pc (149.14 l.y.)
Coord 2000 |
11425+2355 |
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Discov num |
COU 390 |
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Comp |
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Coord arcsec 2000 |
11 42 30.32 +23 54 22.9 |
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Date first |
1969 |
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Date last |
2018 |
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Obs |
17 |
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Pa first |
161 |
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Pa last |
102.1 |
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P.A. Now (θ) |
102.1° |
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Sep first |
0.8 |
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Sep last |
0.41 |
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Sep. Now (ρ) |
0.41" |
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Mag pri |
9.27 |
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Mag sec |
11.66 |
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delta mag (ΔM) |
2.39 |
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Spectral class |
G5 (yellow) |
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Pri motion ra |
+058 |
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Sec motion ra |
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Pri motion dec |
+085 |
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Sec motion dec |
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Notes |
O
(Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
Name |
HD 101728 |
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Constellation |
Leo |
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SAO |
81950 |
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HIP |
57112 |
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Tycho2 |
1982-01889-1 |
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Gaia DR2 |
4004906065484563200 |
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HD |
101728 |
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BD |
BD+24 2384 |
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Distance |
45.72 |
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Distance ly |
149.14 |
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ORBITAL ELEMENTS
Period (P) | 92.75y | ± 5.57 |
Periastron (T) | 2007.86y | ± 0.28 |
Semi-major axis (a) | 0.5498a | ± 0.0168 |
Eccentricity (e) | 0.786 | ± 0.014 |
Inclination (i) | 43.6° | ± 3.2 |
Longitude of periastron (ω) | 100.9° | ± 2.7 |
Node (Ω) | 231.4° | ± 3.2 |
Notes | | |
Reference | Tok2016e | |
Equinox | 2000 | |
Last observation | | |
Grade | 4 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
209.1 |
0.403 |
2001 |
212.6 |
0.374 |
2002 |
216.6 |
0.342 |
2003 |
221.6 |
0.306 |
2004 |
228.1 |
0.266 |
2005 |
237.1 |
0.218 |
2006 |
251.7 |
0.164 |
2007 |
282.1 |
0.107 |
2008 |
345.8 |
0.089 |
2009 |
31.4 |
0.135 |
2010 |
52.2 |
0.185 |
2011 |
64.6 |
0.227 |
2012 |
73.4 |
0.262 |
2013 |
80.2 |
0.293 |
2014 |
85.8 |
0.320 |
2015 |
90.5 |
0.345 |
2016 |
94.7 |
0.367 |
2017 |
98.3 |
0.388 |
2018 |
101.7 |
0.408 |
2019 |
104.7 |
0.427 |
2020 |
107.4 |
0.444 |
2021 |
110.0 |
0.461 |
2022 |
112.4 |
0.476 |
2023 |
114.7 |
0.491 |
2024 |
116.8 |
0.505 |
2025 |
118.8 |
0.519 |
2026 |
120.7 |
0.532 |
2027 |
122.5 |
0.545 |
2028 |
124.2 |
0.557 |
2029 |
125.9 |
0.568 |
2030 |
127.5 |
0.579 |
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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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