18018+0118 BU 1125 AB (68 Oph)
18h 01m 45.19s +01° 18' 18.4" P.A. 170.00 sep 0.4 mag 4.52,7.48 Sp A2Vn dist. 89.69 pc (292.57 l.y.)
Coord 2000 |
18018+0118 |
|
Discov num |
BU 1125 |
|
Comp |
AB |
|
Coord arcsec 2000 |
18 01 45.19 +01 18 18.4 |
|
Date first |
1889 |
|
Date last |
2021 |
|
Obs |
61 |
|
Pa first |
12 |
|
Pa last |
169.5 |
|
P.A. Now (θ) |
169.5° |
|
Sep first |
1.1 |
|
Sep last |
0.404 |
|
Sep. Now (ρ) |
0.404" |
|
Mag pri |
4.52 |
|
Mag sec |
7.48 |
|
delta mag (ΔM) |
2.96 |
|
Spectral class |
A2Vn (white) |
|
Pri motion ra |
+013 |
|
Sec motion ra |
|
|
Pri motion dec |
-015 |
|
Sec motion dec |
|
|
Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
18018+0118 SYSTEM COMPONENTS
Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
Show |
68 Oph |
123035 |
18 01 45 +01 18 18 |
BU 1125 AB |
2021 |
61 |
170 |
0.4 |
4.52 |
7.48 |
2.96 |
Y |
<=== |
Show |
|
123035 |
18 01 45 +01 18 18 |
SP 3 AB,C |
1892 |
1 |
315 |
0.4 |
4.45 |
|
|
|
|
Triple system
4 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
Name |
68 Oph |
|
Var name |
NSV10009 Oph |
|
Constellation |
Ophiuchus |
|
SAO |
123035 |
|
HIP |
88290 |
|
Tycho2 |
0430-03748-1 |
|
Gaia DR2 |
4467810837428358144 |
|
HD |
164577 |
|
HR |
6723 |
|
GC |
24534 |
|
ADS |
10990 |
|
BD |
BD+01 3560 |
|
Flamsteed |
68 Ophiuchi |
|
Flamsteed name |
68 Oph |
|
Distance |
89.69 |
|
Distance ly |
292.57 |
|
ORBITAL ELEMENTS
Period (P) | 213.97y | ± 23.83 |
Periastron (T) | 2028.73y | ± 1.62 |
Semi-major axis (a) | 0.787a | ± 0.033 |
Eccentricity (e) | 0.601 | ± 0.074 |
Inclination (i) | 55.1° | ± 5.1 |
Longitude of periastron (ω) | 66° | ± 5.1 |
Node (Ω) | 161.3° | ± 4.4 |
Notes | n | |
Reference | Tok2015c | |
Equinox | 2000 | |
Last observation | 2014 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
122.4 |
0.539 |
2001 |
124.0 |
0.536 |
2002 |
125.7 |
0.533 |
2003 |
127.4 |
0.530 |
2004 |
129.1 |
0.527 |
2005 |
130.8 |
0.524 |
2006 |
132.6 |
0.520 |
2007 |
134.3 |
0.515 |
2008 |
136.2 |
0.511 |
2009 |
138.0 |
0.506 |
2010 |
139.9 |
0.500 |
2011 |
141.8 |
0.493 |
2012 |
143.8 |
0.486 |
2013 |
145.8 |
0.479 |
2014 |
148.0 |
0.470 |
2015 |
150.2 |
0.460 |
2016 |
152.5 |
0.450 |
2017 |
154.9 |
0.438 |
2018 |
157.5 |
0.425 |
2019 |
160.2 |
0.410 |
2020 |
163.1 |
0.394 |
2021 |
166.4 |
0.376 |
2022 |
169.9 |
0.357 |
2023 |
173.9 |
0.336 |
2024 |
178.4 |
0.314 |
2025 |
183.6 |
0.291 |
2026 |
189.7 |
0.267 |
2027 |
197.0 |
0.244 |
2028 |
205.9 |
0.222 |
2029 |
216.5 |
0.203 |
2030 |
228.8 |
0.190 |
|
|
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
|
|
|
|
|
|
|
|
Measures: green=micrometric, blue=interferometric, purple=photographic |
|