17210-2107 DON 832 AB (Xi Oph)
17h 21m 00.37s -21° 06' 46.5" P.A. 26.00 sep 4.1 mag 4.40,8.90 Sp F1III-IV dist. 17.36 pc (56.63 l.y.)
| Coord 2000 |
17210-2107 |
|
Discov num |
DON 832 |
|
Comp |
AB |
|
Coord arcsec 2000 |
17 21 00.37 -21 06 46.5 |
|
| Date first |
1932 |
|
Date last |
2016 |
|
Obs |
18 |
|
| Pa first |
66 |
|
Pa last |
26.3 |
|
P.A. Now (θ) |
26.3° |
|
| Sep first |
2.5 |
|
Sep last |
4.083 |
|
Sep. Now (ρ) |
4.083" |
|
| Mag pri |
4.40 |
|
Mag sec |
8.90 |
|
delta mag (ΔM) |
4.5 |
|
Spectral class |
F1III-IV (yellow-white) |
|
| Pri motion ra |
+256 |
|
Sec motion ra |
|
|
| Pri motion dec |
-211 |
|
Sec motion dec |
|
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
17210-2107 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
Xi Oph |
185296 |
17 21 00 -21 06 46 |
DON 832 AB |
2016 |
18 |
26 |
4.1 |
4.40 |
8.90 |
4.50 |
Y |
<=== |
| Show |
|
185296 |
17 21 00 -21 06 46 |
TNN 8 AC |
2004 |
1 |
261 |
10.8 |
3.07 |
13.74 |
10.67 |
|
|
Triple system
3 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Name |
Xi Oph |
|
Constellation |
Ophiuchus |
|
SAO |
185296 |
|
HIP |
84893 |
|
| Tycho2 |
6246-00664-1 |
|
HD |
156897 |
|
HR |
6445 |
|
GC |
23423 |
|
| GL |
Gl 670A |
|
BD |
BD-20 4731 |
|
Bayer |
Xi Ophiuchi |
|
Bayer name |
Xi Oph |
|
| Flamsteed |
40 Ophiuchi |
|
Flamsteed name |
40 Oph |
|
Distance |
17.36 |
|
Distance ly |
56.63 |
|
| Bayer greek |
ξ Oph |
|
ORBITAL ELEMENTS
| Period (P) | 421.5869y | ± 221.2186 |
Periastron (T) | 2026.7466y | ± 8.4825 |
Semi-major axis (a) | 7.90942a | ± 5.0354 |
| Eccentricity (e) | 0.73578 | ± 0.20556 |
Inclination (i) | 99.36° | ± 5.068 |
Longitude of periastron (ω) | 75.752° | ± 19.221 |
| Node (Ω) | 28.815° | ± 4.745 |
Notes | n | |
Reference | Izm2019 | |
| Equinox | | |
Last observation | 2010 | |
Grade | 5 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
35.3 |
4.046 |
| 2001 |
35.0 |
4.017 |
| 2002 |
34.6 |
3.984 |
| 2003 |
34.2 |
3.946 |
| 2004 |
33.8 |
3.905 |
| 2005 |
33.4 |
3.859 |
| 2006 |
33.0 |
3.807 |
| 2007 |
32.6 |
3.750 |
| 2008 |
32.2 |
3.687 |
| 2009 |
31.8 |
3.617 |
| 2010 |
31.3 |
3.540 |
| 2011 |
30.8 |
3.456 |
| 2012 |
30.3 |
3.363 |
| 2013 |
29.8 |
3.261 |
| 2014 |
29.2 |
3.149 |
| 2015 |
28.6 |
3.027 |
| 2016 |
27.9 |
2.892 |
| 2017 |
27.2 |
2.746 |
| 2018 |
26.4 |
2.586 |
| 2019 |
25.4 |
2.411 |
| 2020 |
24.3 |
2.222 |
| 2021 |
23.0 |
2.017 |
| 2022 |
21.4 |
1.797 |
| 2023 |
19.3 |
1.562 |
| 2024 |
16.4 |
1.315 |
| 2025 |
12.2 |
1.058 |
| 2026 |
5.2 |
0.798 |
| 2027 |
351.7 |
0.551 |
| 2028 |
321.6 |
0.370 |
| 2029 |
274.8 |
0.379 |
| 2030 |
246.5 |
0.569 |
|
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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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