18150-5018 I 429 (HD 166839)
18h 15m 00.43s -50° 18' 29.0" P.A. 303.00 sep 0.1 mag 8.00,8.20 Sp A0V
| Coord 2000 |
18150-5018 |
|
Discov num |
I 429 |
|
Comp |
|
|
Coord arcsec 2000 |
18 15 00.43 -50 18 29.0 |
|
| Date first |
1902 |
|
Date last |
2021 |
|
Obs |
29 |
|
| Pa first |
150 |
|
Pa last |
302.5 |
|
P.A. Now (θ) |
124.8° |
|
| Sep first |
0.5 |
|
Sep last |
0.056 |
|
Sep. Now (ρ) |
0.076" |
|
| Mag pri |
8.00 |
|
Mag sec |
8.20 |
|
delta mag (ΔM) |
0.2 |
|
Spectral class |
A0V (white) |
|
| Pri motion ra |
+004 |
|
Sec motion ra |
|
|
| Pri motion dec |
-038 |
|
Sec motion dec |
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|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 166839 |
|
Constellation |
Telescopium |
|
SAO |
245344 |
|
Tycho2 |
8366-02361-1 |
|
| Gaia DR2 |
6703329357805862016 |
|
HD |
166839 |
|
GC |
24867 |
|
ORBITAL ELEMENTS SOLUTION #1
| Period (P) | 69.81y | ± 2 |
Periastron (T) | 1946.53y | ± 0.85 |
Semi-major axis (a) | 0.096a | ± 0.003 |
| Eccentricity (e) | 0.887 | ± 0.01 |
Inclination (i) | 66.1° | ± 3 |
Longitude of periastron (ω) | 355.9° | ± 10 |
| Node (Ω) | 320.1° | ± 6 |
Notes | n | |
Reference | Doc2022b | |
| Equinox | | |
Last observation | 2021 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
144.3 |
0.144 |
| 2001 |
144.7 |
0.139 |
| 2002 |
145.2 |
0.134 |
| 2003 |
145.7 |
0.129 |
| 2004 |
146.3 |
0.123 |
| 2005 |
146.9 |
0.117 |
| 2006 |
147.6 |
0.110 |
| 2007 |
148.4 |
0.103 |
| 2008 |
149.3 |
0.096 |
| 2009 |
150.3 |
0.087 |
| 2010 |
151.6 |
0.078 |
| 2011 |
153.3 |
0.068 |
| 2012 |
155.5 |
0.058 |
| 2013 |
158.9 |
0.045 |
| 2014 |
165.0 |
0.032 |
| 2015 |
182.0 |
0.016 |
| 2016 |
286.6 |
0.008 |
| 2017 |
24.1 |
0.008 |
| 2018 |
96.4 |
0.019 |
| 2019 |
111.1 |
0.032 |
| 2020 |
117.2 |
0.045 |
| 2021 |
120.7 |
0.056 |
| 2022 |
123.1 |
0.067 |
| 2023 |
124.8 |
0.076 |
| 2024 |
126.2 |
0.085 |
| 2025 |
127.3 |
0.093 |
| 2026 |
128.3 |
0.100 |
| 2027 |
129.1 |
0.107 |
| 2028 |
129.8 |
0.114 |
| 2029 |
130.5 |
0.120 |
| 2030 |
131.1 |
0.126 |
|
|
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
|
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|
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|
|
Measures: green=micrometric, blue=interferometric, purple=photographic |
|
ORBITAL ELEMENTS SOLUTION #2
| Period (P) | 130y | |
Periastron (T) | 2013.19y | ± 4.23 |
Semi-major axis (a) | 0.193a | ± 0.004 |
| Eccentricity (e) | 0.129 | ± 0.031 |
Inclination (i) | 84.8° | ± 0.4 |
Longitude of periastron (ω) | 78.8° | ± 14.7 |
| Node (Ω) | 138.1° | ± 0.7 |
Notes | n | |
Reference | Tok2021f | |
| Equinox | | |
Last observation | 2021 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
141.4 |
0.148 |
| 2001 |
141.8 |
0.141 |
| 2002 |
142.3 |
0.135 |
| 2003 |
142.8 |
0.127 |
| 2004 |
143.5 |
0.120 |
| 2005 |
144.1 |
0.112 |
| 2006 |
145.0 |
0.103 |
| 2007 |
145.9 |
0.094 |
| 2008 |
147.1 |
0.085 |
| 2009 |
148.5 |
0.076 |
| 2010 |
150.3 |
0.067 |
| 2011 |
152.8 |
0.057 |
| 2012 |
156.2 |
0.047 |
| 2013 |
161.4 |
0.038 |
| 2014 |
170.1 |
0.028 |
| 2015 |
186.2 |
0.020 |
| 2016 |
216.8 |
0.016 |
| 2017 |
254.4 |
0.017 |
| 2018 |
278.0 |
0.024 |
| 2019 |
290.2 |
0.032 |
| 2020 |
297.1 |
0.042 |
| 2021 |
301.4 |
0.051 |
| 2022 |
304.4 |
0.061 |
| 2023 |
306.5 |
0.071 |
| 2024 |
308.1 |
0.080 |
| 2025 |
309.4 |
0.089 |
| 2026 |
310.5 |
0.098 |
| 2027 |
311.4 |
0.107 |
| 2028 |
312.1 |
0.115 |
| 2029 |
312.8 |
0.124 |
| 2030 |
313.3 |
0.131 |
|
|
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
|
|
|
|
|
|
|
|
Measures: green=micrometric, blue=interferometric, purple=photographic |
|
