18126+1224 HDS 2570 (HD 166976)
18h 12m 35.69s +12° 23' 36.9" P.A. 352.00 sep 0.1 mag 8.04,8.88 Sp F0III+A6V dist. 226.24 pc (737.99 l.y.)
| Coord 2000 |
18126+1224 |
|
Discov num |
HDS2570 |
|
Comp |
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Coord arcsec 2000 |
18 12 35.69 +12 23 36.9 |
|
| Date first |
1991 |
|
Date last |
2021 |
|
Obs |
8 |
|
| Pa first |
139 |
|
Pa last |
352.4 |
|
P.A. Now (θ) |
352.4° |
|
| Sep first |
0.2 |
|
Sep last |
0.062 |
|
Sep. Now (ρ) |
0.062" |
|
| Mag pri |
8.04 |
|
Mag sec |
8.88 |
|
delta mag (ΔM) |
0.84 |
|
Spectral class |
F0III+A6V (yellow-white/white) |
|
| Pri motion ra |
+006 |
|
Sec motion ra |
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| Pri motion dec |
+002 |
|
Sec motion dec |
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| Notes |
O
(Orbital solution) |
|
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 166976 |
|
Constellation |
Ophiuchus |
|
SAO |
103481 |
|
HIP |
89235 |
|
| Tycho2 |
1017-01625-1 |
|
Gaia DR2 |
4496880653555218176 |
|
HD |
166976 |
|
BD |
BD+12 3422 |
|
| Distance |
226.24 |
|
Distance ly |
737.99 |
|
ORBITAL ELEMENTS
| Period (P) | 85y | |
Periastron (T) | 2009.87y | |
Semi-major axis (a) | 0.158a | |
| Eccentricity (e) | 0.45 | |
Inclination (i) | 73° | |
Longitude of periastron (ω) | 149.6° | |
| Node (Ω) | 132.2° | |
Notes | | |
Reference | Tok2020g | |
| Equinox | 2000 | |
Last observation | 2019 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
156.8 |
0.076 |
| 2001 |
162.5 |
0.063 |
| 2002 |
171.1 |
0.051 |
| 2003 |
184.8 |
0.040 |
| 2004 |
207.1 |
0.032 |
| 2005 |
237.1 |
0.030 |
| 2006 |
263.3 |
0.036 |
| 2007 |
280.2 |
0.046 |
| 2008 |
290.7 |
0.057 |
| 2009 |
297.8 |
0.068 |
| 2010 |
303.1 |
0.077 |
| 2011 |
307.3 |
0.084 |
| 2012 |
310.9 |
0.089 |
| 2013 |
314.3 |
0.092 |
| 2014 |
317.5 |
0.093 |
| 2015 |
320.7 |
0.091 |
| 2016 |
324.1 |
0.088 |
| 2017 |
327.8 |
0.084 |
| 2018 |
332.0 |
0.079 |
| 2019 |
336.7 |
0.073 |
| 2020 |
342.3 |
0.068 |
| 2021 |
348.9 |
0.062 |
| 2022 |
356.9 |
0.056 |
| 2023 |
6.4 |
0.052 |
| 2024 |
17.4 |
0.049 |
| 2025 |
29.5 |
0.047 |
| 2026 |
41.8 |
0.048 |
| 2027 |
53.5 |
0.050 |
| 2028 |
63.8 |
0.054 |
| 2029 |
72.4 |
0.059 |
| 2030 |
79.6 |
0.065 |
|
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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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