20564-5916 I 129 AB (HD 198943)
20h 56m 26.63s -59° 16' 25.0" P.A. 335.00 sep 2.6 mag 8.22,9.96 Sp G2V dist. 53.05 pc (173.05 l.y.)
| Coord 2000 |
20564-5916 |
|
Discov num |
I 129 |
|
Comp |
AB |
|
Coord arcsec 2000 |
20 56 26.63 -59 16 25.0 |
|
| Date first |
1896 |
|
Date last |
2016 |
|
Obs |
17 |
|
| Pa first |
30 |
|
Pa last |
334.6 |
|
P.A. Now (θ) |
334.6° |
|
| Sep first |
1.0 |
|
Sep last |
2.647 |
|
Sep. Now (ρ) |
2.647" |
|
| Mag pri |
8.22 |
|
Mag sec |
9.96 |
|
delta mag (ΔM) |
1.74 |
|
Spectral class |
G2V (yellow) |
|
| Pri motion ra |
+001 |
|
Sec motion ra |
|
|
| Pri motion dec |
-037 |
|
Sec motion dec |
|
|
| Notes |
O
(Orbital solution) |
|
This double is physical.
20564-5916 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
HD 198943 |
246799 |
20 56 27 -59 16 25 |
I 129 AB |
2016 |
17 |
335 |
2.6 |
8.22 |
9.96 |
1.74 |
Y |
<=== |
| Show |
|
246799 |
20 56 27 -59 16 25 |
I 129 AC |
2015 |
5 |
26 |
38.4 |
8.22 |
13.64 |
5.42 |
|
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Triple system
3 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 198943 |
|
Constellation |
Indus |
|
SAO |
246799 |
|
HIP |
103361 |
|
| Tycho2 |
8804-00877-1 |
|
Gaia DR2 |
6456205770039152640 |
|
HD |
198943 |
|
GC |
29184 |
|
| CP |
CP-59 7652 |
|
Distance |
53.05 |
|
Distance ly |
173.05 |
|
ORBITAL ELEMENTS
| Period (P) | 1743.1208y | ± 789.291 |
Periastron (T) | 1763.6023y | ± 358.8003 |
Semi-major axis (a) | 11.62162a | ± 6.48778 |
| Eccentricity (e) | 0.94298 | ± 0.1285 |
Inclination (i) | 99.648° | ± 7.395 |
Longitude of periastron (ω) | 289.829° | ± 36.576 |
| Node (Ω) | 90.748° | ± 40.556 |
Notes | | |
Reference | Izm2019 | |
| Equinox | | |
Last observation | 2014 | |
Grade | 5 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
338.3 |
2.505 |
| 2001 |
338.1 |
2.515 |
| 2002 |
337.8 |
2.525 |
| 2003 |
337.6 |
2.536 |
| 2004 |
337.3 |
2.546 |
| 2005 |
337.1 |
2.556 |
| 2006 |
336.9 |
2.566 |
| 2007 |
336.6 |
2.577 |
| 2008 |
336.4 |
2.587 |
| 2009 |
336.2 |
2.598 |
| 2010 |
335.9 |
2.608 |
| 2011 |
335.7 |
2.619 |
| 2012 |
335.5 |
2.629 |
| 2013 |
335.3 |
2.640 |
| 2014 |
335.0 |
2.650 |
| 2015 |
334.8 |
2.661 |
| 2016 |
334.6 |
2.671 |
| 2017 |
334.4 |
2.682 |
| 2018 |
334.2 |
2.692 |
| 2019 |
334.0 |
2.703 |
| 2020 |
333.7 |
2.714 |
| 2021 |
333.5 |
2.724 |
| 2022 |
333.3 |
2.735 |
| 2023 |
333.1 |
2.746 |
| 2024 |
332.9 |
2.756 |
| 2025 |
332.7 |
2.767 |
| 2026 |
332.5 |
2.778 |
| 2027 |
332.3 |
2.789 |
| 2028 |
332.1 |
2.800 |
| 2029 |
331.9 |
2.810 |
| 2030 |
331.7 |
2.821 |
|
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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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