18166-2033 MCA 51 (17 Sgr)
18h 16m 35.37s -20° 32' 40.1" P.A. 321.00 sep 0.1 mag 7.24,8.89 Sp G5IV+A5 dist. 180.51 pc (588.82 l.y.)
Coord 2000 |
18166-2033 |
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Discov num |
MCA 51 |
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Comp |
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Coord arcsec 2000 |
18 16 35.37 -20 32 40.1 |
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Date first |
1976 |
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Date last |
2021 |
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Obs |
19 |
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Pa first |
313 |
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Pa last |
320.9 |
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P.A. Now (θ) |
320.9° |
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Sep first |
0.3 |
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Sep last |
0.063 |
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Sep. Now (ρ) |
0.063" |
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Mag pri |
7.24 |
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Mag sec |
8.89 |
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delta mag (ΔM) |
1.65 |
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Spectral class |
G5IV+A5 (yellow/white) |
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Pri motion ra |
+008 |
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Sec motion ra |
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Pri motion dec |
-011 |
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Sec motion dec |
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Notes |
N
O
(See Notes, Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
Name |
17 Sgr |
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Constellation |
Sagittarius |
|
SAO |
186575 |
|
HIP |
89567 |
|
Tycho2 |
6273-01426-1 |
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Gaia DR2 |
4094341269029556864 |
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HD |
167570 |
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GC |
24918 |
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BD |
BD-20 5068 |
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Flamsteed |
17 Sagittarii |
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Flamsteed name |
17 Sgr |
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Distance |
180.51 |
|
Distance ly |
588.82 |
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ORBITAL ELEMENTS
Period (P) | 119y | ± 56 |
Periastron (T) | 2031.15y | ± 8.12 |
Semi-major axis (a) | 0.179a | ± 0.028 |
Eccentricity (e) | 0.5 | |
Inclination (i) | 91° | ± 0.6 |
Longitude of periastron (ω) | 164.3° | ± 67.8 |
Node (Ω) | 313.7° | ± 0.6 |
Notes | | |
Reference | Tok2019c | |
Equinox | | |
Last observation | 2018 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
313.3 |
0.207 |
2001 |
313.3 |
0.201 |
2002 |
313.2 |
0.195 |
2003 |
313.2 |
0.189 |
2004 |
313.1 |
0.182 |
2005 |
313.1 |
0.176 |
2006 |
313.1 |
0.168 |
2007 |
313.0 |
0.161 |
2008 |
312.9 |
0.153 |
2009 |
312.9 |
0.145 |
2010 |
312.8 |
0.136 |
2011 |
312.7 |
0.127 |
2012 |
312.6 |
0.118 |
2013 |
312.5 |
0.108 |
2014 |
312.4 |
0.098 |
2015 |
312.2 |
0.087 |
2016 |
312.0 |
0.077 |
2017 |
311.7 |
0.066 |
2018 |
311.3 |
0.054 |
2019 |
310.6 |
0.043 |
2020 |
309.5 |
0.031 |
2021 |
306.9 |
0.018 |
2022 |
294.4 |
0.006 |
2023 |
151.2 |
0.007 |
2024 |
139.5 |
0.019 |
2025 |
137.0 |
0.031 |
2026 |
135.9 |
0.042 |
2027 |
135.2 |
0.053 |
2028 |
134.8 |
0.064 |
2029 |
134.5 |
0.072 |
2030 |
134.2 |
0.080 |
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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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