18031-0811 STF 2262 AB (Tau Oph)
18h 03m 04.91s -08° 10' 48.9" P.A. 291.00 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 |
2021 |
|
Obs |
665 |
|
| Pa first |
193 |
|
Pa last |
291 |
|
P.A. Now (θ) |
290.9° |
|
| Sep first |
0.4 |
|
Sep last |
1.449 |
|
Sep. Now (ρ) |
1.427" |
|
| 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 |
2021 |
665 |
291 |
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 |
164764 |
|
| HR |
6733 |
|
GC |
24565 |
|
ADS |
11005 |
|
GL |
Gl 700.1B |
|
| 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) | 257y | |
Periastron (T) | 1829y | |
Semi-major axis (a) | 1.4a | |
| Eccentricity (e) | 0.77 | |
Inclination (i) | 52° | |
Longitude of periastron (ω) | 42° | |
| Node (Ω) | 60° | |
Notes | n | |
Reference | Sod1999 | |
| Equinox | 2000 | |
Last observation | | |
Grade | 3 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
281.1 |
1.751 |
| 2001 |
281.5 |
1.739 |
| 2002 |
281.8 |
1.726 |
| 2003 |
282.2 |
1.714 |
| 2004 |
282.5 |
1.701 |
| 2005 |
282.9 |
1.688 |
| 2006 |
283.3 |
1.675 |
| 2007 |
283.7 |
1.662 |
| 2008 |
284.1 |
1.649 |
| 2009 |
284.5 |
1.635 |
| 2010 |
284.9 |
1.621 |
| 2011 |
285.3 |
1.607 |
| 2012 |
285.7 |
1.593 |
| 2013 |
286.2 |
1.579 |
| 2014 |
286.6 |
1.564 |
| 2015 |
287.0 |
1.550 |
| 2016 |
287.5 |
1.535 |
| 2017 |
287.9 |
1.520 |
| 2018 |
288.4 |
1.505 |
| 2019 |
288.9 |
1.490 |
| 2020 |
289.4 |
1.474 |
| 2021 |
289.9 |
1.459 |
| 2022 |
290.4 |
1.443 |
| 2023 |
290.9 |
1.427 |
| 2024 |
291.5 |
1.411 |
| 2025 |
292.0 |
1.395 |
| 2026 |
292.6 |
1.378 |
| 2027 |
293.2 |
1.362 |
| 2028 |
293.7 |
1.345 |
| 2029 |
294.3 |
1.328 |
| 2030 |
295.0 |
1.311 |
|
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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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