18236-2610 HO 566 (HD 168991)
18h 23m 33.28s -26° 10' 17.6" P.A. 143.00 sep 0.5 mag 7.97,9.55 Sp F8V dist. 104.28 pc (340.16 l.y.)
Coord 2000 |
18236-2610 |
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Discov num |
HO 566 |
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Comp |
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Coord arcsec 2000 |
18 23 33.28 -26 10 17.6 |
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Date first |
1889 |
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Date last |
2016 |
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Obs |
24 |
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Pa first |
140 |
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Pa last |
143.2 |
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P.A. Now (θ) |
143.2° |
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Sep first |
0.5 |
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Sep last |
0.543 |
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Sep. Now (ρ) |
0.543" |
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Mag pri |
7.97 |
|
Mag sec |
9.55 |
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delta mag (ΔM) |
1.58 |
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Spectral class |
F8V (yellow-white) |
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Pri motion ra |
+006 |
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Sec motion ra |
+006 |
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Pri motion dec |
-033 |
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Sec motion dec |
-033 |
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Notes |
N
O
(See Notes, Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
Name |
HD 168991 |
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Constellation |
Sagittarius |
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SAO |
186752 |
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HIP |
90128 |
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Tycho2 |
6848-02119-1 |
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Gaia DR2 |
4052892326433799808 |
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HD |
168991 |
|
ADS |
11296 |
|
CD |
CD-2613106 |
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CP |
CP-26 6425 |
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Distance |
104.28 |
|
Distance ly |
340.16 |
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ORBITAL ELEMENTS
Period (P) | 119.87y | |
Periastron (T) | 1968.65y | |
Semi-major axis (a) | 0.376a | |
Eccentricity (e) | 0.784 | |
Inclination (i) | 105.2° | |
Longitude of periastron (ω) | 223.7° | |
Node (Ω) | 154.1° | |
Notes | n | |
Reference | Msn2017a | |
Equinox | 2000 | |
Last observation | 2010 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
147.2 |
0.513 |
2001 |
146.9 |
0.517 |
2002 |
146.7 |
0.521 |
2003 |
146.4 |
0.524 |
2004 |
146.2 |
0.527 |
2005 |
145.9 |
0.529 |
2006 |
145.7 |
0.531 |
2007 |
145.4 |
0.533 |
2008 |
145.2 |
0.534 |
2009 |
144.9 |
0.536 |
2010 |
144.7 |
0.536 |
2011 |
144.4 |
0.537 |
2012 |
144.2 |
0.537 |
2013 |
144.0 |
0.537 |
2014 |
143.7 |
0.536 |
2015 |
143.5 |
0.536 |
2016 |
143.2 |
0.535 |
2017 |
143.0 |
0.533 |
2018 |
142.8 |
0.532 |
2019 |
142.5 |
0.530 |
2020 |
142.3 |
0.528 |
2021 |
142.0 |
0.526 |
2022 |
141.8 |
0.523 |
2023 |
141.5 |
0.520 |
2024 |
141.3 |
0.517 |
2025 |
141.0 |
0.514 |
2026 |
140.7 |
0.510 |
2027 |
140.5 |
0.506 |
2028 |
140.2 |
0.502 |
2029 |
139.9 |
0.498 |
2030 |
139.6 |
0.494 |
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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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