18031-0811 STF 2262 AB (Tau Oph)
18h 03m 04.91s -08° 10' 48.9" P.A. 292.00 sep 1.4 mag 5.27,5.86 Sp F4IV+F5V dist. 51.33 pc (167.44 l.y.)
| Coord 2000 |
18031-0811 |
|
Discov num |
STF2262 |
|
Comp |
AB |
|
Coord arcsec 2000 |
18 03 04.91 -08 10 48.9 |
|
| Date first |
1835 |
|
Date last |
2024 |
|
Obs |
672 |
|
| Pa first |
193 |
|
Pa last |
292.1 |
|
P.A. Now (θ) |
292° |
|
| Sep first |
0.4 |
|
Sep last |
1.406 |
|
Sep. Now (ρ) |
1.395" |
|
| Mag pri |
5.27 |
|
Mag sec |
5.86 |
|
delta mag (ΔM) |
0.59 |
|
Spectral class |
F4IV+F5V (yellow-white/yellow-white) |
|
| Pri motion ra |
+009 |
|
Sec motion ra |
+009 |
|
| Pri motion dec |
-048 |
|
Sec motion dec |
-048 |
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
18031-0811 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
Tau Oph |
142050 |
18 03 05 -08 10 49 |
STF 2262 AB |
2024 |
672 |
292 |
1.4 |
5.27 |
5.86 |
0.59 |
Y |
<=== |
| Show |
|
142050 |
18 03 05 -08 10 49 |
STF 2262 AC |
2000 |
13 |
125 |
100.8 |
5.27 |
11.28 |
6.01 |
|
|
Triple system
3 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Name |
Tau Oph |
|
Var name |
NSV10073 Oph |
|
Constellation |
Ophiuchus |
|
SAO |
142050 |
|
| HIP |
88404 |
|
Tycho2 |
5675-00662-1 |
|
Gaia DR2 |
4170583776094715520 |
|
HD |
164761 |
|
| HR |
6733 |
|
GC |
24565 |
|
ADS |
11005 |
|
BD |
BD-08 4549 |
|
| Bayer |
Tau Ophiuchi |
|
Bayer name |
Tau Oph |
|
Flamsteed |
69 Ophiuchi |
|
Flamsteed name |
69 Oph |
|
| Distance |
51.33 |
|
Distance ly |
167.44 |
|
Bayer greek |
τ Oph |
|
ORBITAL ELEMENTS
| Period (P) | 279.52y | |
Periastron (T) | 1833.51y | |
Semi-major axis (a) | 1.5855a | |
| Eccentricity (e) | 0.765 | |
Inclination (i) | 63.47° | |
Longitude of periastron (ω) | 53.98° | |
| Node (Ω) | 62.97° | |
Notes | n | |
Reference | FSU2025 | |
| Equinox | | |
Last observation | | |
Grade | 3 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
282.1 |
1.693 |
| 2001 |
282.4 |
1.682 |
| 2002 |
282.7 |
1.671 |
| 2003 |
283.1 |
1.660 |
| 2004 |
283.4 |
1.649 |
| 2005 |
283.8 |
1.638 |
| 2006 |
284.1 |
1.627 |
| 2007 |
284.5 |
1.616 |
| 2008 |
284.8 |
1.604 |
| 2009 |
285.2 |
1.593 |
| 2010 |
285.6 |
1.581 |
| 2011 |
285.9 |
1.570 |
| 2012 |
286.3 |
1.558 |
| 2013 |
286.7 |
1.546 |
| 2014 |
287.1 |
1.534 |
| 2015 |
287.5 |
1.522 |
| 2016 |
287.9 |
1.510 |
| 2017 |
288.3 |
1.497 |
| 2018 |
288.7 |
1.485 |
| 2019 |
289.2 |
1.473 |
| 2020 |
289.6 |
1.460 |
| 2021 |
290.0 |
1.447 |
| 2022 |
290.5 |
1.435 |
| 2023 |
290.9 |
1.422 |
| 2024 |
291.4 |
1.409 |
| 2025 |
291.9 |
1.396 |
| 2026 |
292.4 |
1.383 |
| 2027 |
292.8 |
1.370 |
| 2028 |
293.4 |
1.357 |
| 2029 |
293.9 |
1.343 |
| 2030 |
294.4 |
1.330 |
| 2031 |
294.9 |
1.317 |
| 2032 |
295.5 |
1.303 |
| 2033 |
296.0 |
1.290 |
| 2034 |
296.6 |
1.276 |
| 2035 |
297.2 |
1.262 |
| 2036 |
297.7 |
1.249 |
| 2037 |
298.4 |
1.235 |
| 2038 |
299.0 |
1.221 |
| 2039 |
299.6 |
1.207 |
| 2040 |
300.2 |
1.194 |
| 2041 |
300.9 |
1.180 |
| 2042 |
301.6 |
1.166 |
| 2043 |
302.3 |
1.152 |
| 2044 |
303.0 |
1.138 |
| 2045 |
303.7 |
1.124 |
| 2046 |
304.5 |
1.110 |
| 2047 |
305.2 |
1.096 |
| 2048 |
306.0 |
1.082 |
| 2049 |
306.8 |
1.068 |
| 2050 |
307.6 |
1.054 |
|
|
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
Measures: green=micrometric, blue=interferometric, purple=photographic
|
|
