18191-3509 OL 18 (HD 167981)
18h 19m 05.58s -35° 09' 24.6" P.A. 296.00 sep 1.1 mag 9.17,9.73 Sp K3V dist. 31.9 pc (104.06 l.y.)
| Coord 2000 |
18191-3509 |
|
Discov num |
OL 18 |
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Comp |
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Coord arcsec 2000 |
18 19 05.58 -35 09 24.6 |
|
| Date first |
1909 |
|
Date last |
2021 |
|
Obs |
36 |
|
| Pa first |
120 |
|
Pa last |
295.9 |
|
P.A. Now (θ) |
295.9° |
|
| Sep first |
1.9 |
|
Sep last |
1.073 |
|
Sep. Now (ρ) |
1.073" |
|
| Mag pri |
9.17 |
|
Mag sec |
9.73 |
|
delta mag (ΔM) |
0.56 |
|
Spectral class |
K3V (yellow-orange) |
|
| Pri motion ra |
-064 |
|
Sec motion ra |
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| Pri motion dec |
-031 |
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Sec motion dec |
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| Notes |
O
(Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 167981 |
|
Constellation |
Sagittarius |
|
HIP |
89766 |
|
Tycho2 |
7401-01085-1 |
|
| Gaia DR2 |
4038318261054205824 |
|
HD |
167981 |
|
CD |
CD-3512482 |
|
CP |
CP-35 7881 |
|
| Distance |
31.9 |
|
Distance ly |
104.06 |
|
ORBITAL ELEMENTS
| Period (P) | 319.4y | |
Periastron (T) | 2045.22y | |
Semi-major axis (a) | 1.746a | |
| Eccentricity (e) | 0.283 | |
Inclination (i) | 86.6° | |
Longitude of periastron (ω) | 190° | |
| Node (Ω) | 118.6° | |
Notes | | |
Reference | Tok2021c | |
| Equinox | 2000 | |
Last observation | 2021 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
288.4 |
0.492 |
| 2001 |
289.2 |
0.524 |
| 2002 |
289.9 |
0.555 |
| 2003 |
290.5 |
0.586 |
| 2004 |
291.0 |
0.617 |
| 2005 |
291.5 |
0.647 |
| 2006 |
291.9 |
0.677 |
| 2007 |
292.4 |
0.706 |
| 2008 |
292.7 |
0.736 |
| 2009 |
293.1 |
0.764 |
| 2010 |
293.4 |
0.793 |
| 2011 |
293.7 |
0.820 |
| 2012 |
294.0 |
0.847 |
| 2013 |
294.2 |
0.874 |
| 2014 |
294.5 |
0.900 |
| 2015 |
294.7 |
0.925 |
| 2016 |
295.0 |
0.950 |
| 2017 |
295.2 |
0.974 |
| 2018 |
295.4 |
0.997 |
| 2019 |
295.6 |
1.019 |
| 2020 |
295.7 |
1.041 |
| 2021 |
295.9 |
1.062 |
| 2022 |
296.1 |
1.082 |
| 2023 |
296.3 |
1.101 |
| 2024 |
296.4 |
1.119 |
| 2025 |
296.6 |
1.136 |
| 2026 |
296.7 |
1.152 |
| 2027 |
296.9 |
1.167 |
| 2028 |
297.0 |
1.181 |
| 2029 |
297.1 |
1.194 |
| 2030 |
297.3 |
1.205 |
|
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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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