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 |
|
Discov num |
MCA 51 |
|
Comp |
|
|
Coord arcsec 2000 |
18 16 35.37 -20 32 40.1 |
|
| Date first |
1976 |
|
Date last |
2021 |
|
Obs |
19 |
|
| Pa first |
313 |
|
Pa last |
320.9 |
|
P.A. Now (θ) |
320.9° |
|
| Sep first |
0.3 |
|
Sep last |
0.063 |
|
Sep. Now (ρ) |
0.063" |
|
| Mag pri |
7.24 |
|
Mag sec |
8.89 |
|
delta mag (ΔM) |
1.65 |
|
Spectral class |
G5IV+A5 (yellow/white) |
|
| Pri motion ra |
+008 |
|
Sec motion ra |
|
|
| Pri motion dec |
-011 |
|
Sec motion dec |
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| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
17 Sgr |
|
Constellation |
Sagittarius |
|
SAO |
186575 |
|
HIP |
89567 |
|
| Tycho2 |
6273-01426-1 |
|
Gaia DR2 |
4094341269029556864 |
|
HD |
167570 |
|
GC |
24918 |
|
| BD |
BD-20 5068 |
|
Flamsteed |
17 Sagittarii |
|
Flamsteed name |
17 Sgr |
|
Distance |
180.51 |
|
| Distance ly |
588.82 |
|
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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