17104-1544 BU 1118 AB (Sabik)
17h 10m 22.66s -15° 43' 30.5" P.A. 225.00 sep 0.4 mag 3.05,3.27 Sp A1IV+A1IV dist. 27.09 pc (88.37 l.y.)
Coord 2000 |
17104-1544 |
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Discov num |
BU 1118 |
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Comp |
AB |
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Coord arcsec 2000 |
17 10 22.66 -15 43 30.5 |
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Date first |
1889 |
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Date last |
2021 |
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Obs |
246 |
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Pa first |
274 |
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Pa last |
225.4 |
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P.A. Now (θ) |
223.9° |
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Sep first |
0.4 |
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Sep last |
0.408 |
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Sep. Now (ρ) |
0.345" |
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Mag pri |
3.05 |
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Mag sec |
3.27 |
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delta mag (ΔM) |
0.22 |
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Spectral class |
A1IV+A1IV (white/white) |
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Pri motion ra |
+045 |
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Sec motion ra |
|
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Pri motion dec |
+064 |
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Sec motion dec |
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Notes |
N
O
(See Notes, Orbital solution) |
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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 |
2021 |
246 |
225 |
0.4 |
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 |
|
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Quintuple system
6 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 |
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GC |
23158 |
|
ADS |
10374 |
|
GL |
Gl 656.1A |
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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) | 87.58y | ± 1 |
Periastron (T) | 2024.68y | ± 0.5 |
Semi-major axis (a) | 1.396a | ± 0.01 |
Eccentricity (e) | 0.95 | ± 0.02 |
Inclination (i) | 95.2° | ± 2 |
Longitude of periastron (ω) | 274.8° | ± 2 |
Node (Ω) | 38.9° | ± 1 |
Notes | n | |
Reference | Doc2007d | |
Equinox | 2000 | |
Last observation | 2006 | |
Grade | 2 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
242.3 |
0.532 |
2001 |
241.5 |
0.540 |
2002 |
240.7 |
0.547 |
2003 |
240.0 |
0.554 |
2004 |
239.2 |
0.560 |
2005 |
238.5 |
0.566 |
2006 |
237.8 |
0.571 |
2007 |
237.1 |
0.575 |
2008 |
236.4 |
0.578 |
2009 |
235.8 |
0.580 |
2010 |
235.1 |
0.581 |
2011 |
234.4 |
0.581 |
2012 |
233.8 |
0.580 |
2013 |
233.1 |
0.577 |
2014 |
232.4 |
0.573 |
2015 |
231.7 |
0.567 |
2016 |
231.0 |
0.558 |
2017 |
230.2 |
0.546 |
2018 |
229.5 |
0.532 |
2019 |
228.6 |
0.512 |
2020 |
227.7 |
0.487 |
2021 |
226.7 |
0.455 |
2022 |
225.5 |
0.410 |
2023 |
223.9 |
0.345 |
2024 |
221.2 |
0.228 |
2025 |
38.1 |
0.143 |
2026 |
33.0 |
0.266 |
2027 |
30.3 |
0.310 |
2028 |
28.1 |
0.332 |
2029 |
26.1 |
0.344 |
2030 |
24.2 |
0.350 |
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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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