17104-1544 BU 1118 AB (Sabik)
17h 10m 22.66s -15° 43' 30.5" P.A. 222.00 sep 0.3 mag 3.05,3.27 Sp A1IV+A1IV dist. 27.09 pc (88.37 l.y.)
| Coord 2000 |
17104-1544 |
|
Discov num |
BU 1118 |
|
Comp |
AB |
|
Coord arcsec 2000 |
17 10 22.66 -15 43 30.5 |
|
| Date first |
1889 |
|
Date last |
2023 |
|
Obs |
252 |
|
| Pa first |
274 |
|
Pa last |
221.5 |
|
P.A. Now (θ) |
221.5° |
|
| Sep first |
0.4 |
|
Sep last |
0.25 |
|
Sep. Now (ρ) |
0.25" |
|
| Mag pri |
3.05 |
|
Mag sec |
3.27 |
|
delta mag (ΔM) |
0.22 |
|
Spectral class |
A1IV+A1IV (white/white) |
|
| Pri motion ra |
+045 |
|
Sec motion ra |
|
|
| Pri motion dec |
+064 |
|
Sec motion dec |
|
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
17104-1544 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
Sabik |
160332 |
17 10 23 -15 43 30 |
BU 1118 AB |
2023 |
252 |
222 |
0.3 |
3.05 |
3.27 |
0.22 |
Y |
<=== |
| Show |
Eta Oph |
160332 |
17 10 23 -15 43 30 |
BU 1118 AB,C |
2012 |
6 |
148 |
99.8 |
2.42 |
12.34 |
9.92 |
|
|
| Show |
Sabik |
160332 |
17 10 23 -15 43 30 |
BU 1118 AD |
2012 |
8 |
281 |
101.2 |
2.42 |
11.20 |
8.78 |
|
|
| Show |
Sabik |
160332 |
17 10 23 -15 43 30 |
DAL 52 AE |
2012 |
2 |
317 |
62.7 |
2.42 |
11.10 |
8.68 |
|
|
0 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Common name |
Sabik |
|
Constellation |
Ophiuchus |
|
SAO |
160332 |
|
HIP |
84012 |
|
| Tycho2 |
6232-01333-1 |
|
HD |
155125 |
|
HR |
6378 |
|
GC |
23158 |
|
| ADS |
10374 |
|
BD |
BD-15 4467 |
|
Bayer |
Eta Ophiuchi |
|
Bayer name |
Eta Oph |
|
| Flamsteed |
35 Ophiuchi |
|
Flamsteed name |
35 Oph |
|
Distance |
27.09 |
|
Distance ly |
88.37 |
|
| Bayer greek |
η Oph |
|
ORBITAL ELEMENTS
| Period (P) | 87.76y | ± 1.1 |
Periastron (T) | 2024.47y | ± 0.15 |
Semi-major axis (a) | 1.307a | ± 0.105 |
| Eccentricity (e) | 0.942 | ± 0.021 |
Inclination (i) | 95.6° | ± 1 |
Longitude of periastron (ω) | 275.3° | ± 1 |
| Node (Ω) | 39.2° | ± 1 |
Notes | n | |
Reference | Doc2023c | |
| Equinox | 2000 | |
Last observation | 2023 | |
Grade | 2 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
242.0 |
0.542 |
| 2001 |
241.2 |
0.549 |
| 2002 |
240.5 |
0.556 |
| 2003 |
239.7 |
0.563 |
| 2004 |
239.0 |
0.569 |
| 2005 |
238.3 |
0.574 |
| 2006 |
237.6 |
0.578 |
| 2007 |
237.0 |
0.582 |
| 2008 |
236.3 |
0.585 |
| 2009 |
235.6 |
0.587 |
| 2010 |
235.0 |
0.587 |
| 2011 |
234.3 |
0.587 |
| 2012 |
233.6 |
0.585 |
| 2013 |
232.9 |
0.582 |
| 2014 |
232.3 |
0.576 |
| 2015 |
231.6 |
0.569 |
| 2016 |
230.8 |
0.559 |
| 2017 |
230.1 |
0.546 |
| 2018 |
229.3 |
0.530 |
| 2019 |
228.4 |
0.509 |
| 2020 |
227.5 |
0.481 |
| 2021 |
226.4 |
0.445 |
| 2022 |
225.1 |
0.395 |
| 2023 |
223.4 |
0.320 |
| 2024 |
219.6 |
0.174 |
| 2025 |
37.3 |
0.180 |
| 2026 |
33.0 |
0.275 |
| 2027 |
30.4 |
0.315 |
| 2028 |
28.2 |
0.335 |
| 2029 |
26.2 |
0.346 |
| 2030 |
24.3 |
0.351 |
| 2031 |
22.5 |
0.352 |
| 2032 |
20.6 |
0.351 |
| 2033 |
18.7 |
0.347 |
| 2034 |
16.8 |
0.342 |
| 2035 |
14.8 |
0.336 |
| 2036 |
12.7 |
0.329 |
| 2037 |
10.6 |
0.321 |
| 2038 |
8.3 |
0.313 |
| 2039 |
5.9 |
0.304 |
| 2040 |
3.3 |
0.296 |
| 2041 |
0.6 |
0.287 |
| 2042 |
357.8 |
0.279 |
| 2043 |
354.7 |
0.271 |
| 2044 |
351.5 |
0.264 |
| 2045 |
348.1 |
0.257 |
| 2046 |
344.5 |
0.250 |
| 2047 |
340.8 |
0.244 |
| 2048 |
336.9 |
0.239 |
| 2049 |
332.8 |
0.235 |
| 2050 |
328.6 |
0.232 |
|
|
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
Measures: green=micrometric, blue=interferometric, purple=photographic
|
|
