18121+4644 COU 2118 (HD 167260)
18h 12m 05.16s +46° 44' 11.9" P.A. 274.00 sep 0.1 mag 8.71,11.07 Sp G5 dist. 98.62 pc (321.7 l.y.)
| Coord 2000 |
18121+4644 |
|
Discov num |
COU2118 |
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Comp |
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Coord arcsec 2000 |
18 12 05.16 +46 44 11.9 |
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| Date first |
1982 |
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Date last |
2014 |
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Obs |
12 |
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| Pa first |
42 |
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Pa last |
274 |
|
P.A. Now (θ) |
274° |
|
| Sep first |
0.2 |
|
Sep last |
0.129 |
|
Sep. Now (ρ) |
0.129" |
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| Mag pri |
8.71 |
|
Mag sec |
11.07 |
|
delta mag (ΔM) |
2.36 |
|
Spectral class |
G5 (yellow) |
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| Pri motion ra |
-057 |
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Sec motion ra |
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| Pri motion dec |
-058 |
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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 167260 |
|
Constellation |
Hercules |
|
SAO |
47298 |
|
HIP |
89186 |
|
| Tycho2 |
3525-02233-1 |
|
Gaia DR2 |
2122323905675529728 |
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HD |
167260 |
|
BD |
BD+46 2441 |
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| Distance |
98.62 |
|
Distance ly |
321.7 |
|
ORBITAL ELEMENTS
| Period (P) | 25.2y | |
Periastron (T) | 1994.61y | |
Semi-major axis (a) | 0.143a | |
| Eccentricity (e) | 0.55 | |
Inclination (i) | 37.5° | |
Longitude of periastron (ω) | 73° | |
| Node (Ω) | 150° | |
Notes | | |
Reference | Cou1999b | |
| Equinox | | |
Last observation | | |
Grade | 5 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
354.3 |
0.158 |
| 2001 |
1.5 |
0.168 |
| 2002 |
8.1 |
0.175 |
| 2003 |
14.3 |
0.179 |
| 2004 |
20.2 |
0.182 |
| 2005 |
26.0 |
0.183 |
| 2006 |
31.8 |
0.182 |
| 2007 |
37.7 |
0.181 |
| 2008 |
43.7 |
0.178 |
| 2009 |
49.9 |
0.174 |
| 2010 |
56.5 |
0.170 |
| 2011 |
63.4 |
0.164 |
| 2012 |
70.9 |
0.158 |
| 2013 |
79.0 |
0.151 |
| 2014 |
87.9 |
0.143 |
| 2015 |
98.0 |
0.134 |
| 2016 |
109.8 |
0.123 |
| 2017 |
124.0 |
0.110 |
| 2018 |
143.0 |
0.092 |
| 2019 |
173.4 |
0.068 |
| 2020 |
232.6 |
0.052 |
| 2021 |
290.5 |
0.071 |
| 2022 |
317.7 |
0.100 |
| 2023 |
333.2 |
0.124 |
| 2024 |
344.0 |
0.142 |
| 2025 |
352.7 |
0.156 |
| 2026 |
0.1 |
0.166 |
| 2027 |
6.8 |
0.174 |
| 2028 |
13.1 |
0.178 |
| 2029 |
19.0 |
0.181 |
| 2030 |
24.9 |
0.183 |
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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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