21395+3009 A 772 (HD 206168)
21h 39m 30.24s +30° 09' 22.2" P.A. 112.00 sep 0.1 mag 8.70,9.80 Sp A5 dist. 202.84 pc (661.66 l.y.)
| Coord 2000 |
21395+3009 |
|
Discov num |
A 772 |
|
Comp |
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Coord arcsec 2000 |
21 39 30.24 +30 09 22.2 |
|
| Date first |
1904 |
|
Date last |
2007 |
|
Obs |
45 |
|
| Pa first |
27 |
|
Pa last |
112 |
|
P.A. Now (θ) |
43.8° |
|
| Sep first |
0.3 |
|
Sep last |
0.148 |
|
Sep. Now (ρ) |
0.202" |
|
| Mag pri |
8.70 |
|
Mag sec |
9.80 |
|
delta mag (ΔM) |
1.1 |
|
Spectral class |
A5 (white) |
|
| Pri motion ra |
+023 |
|
Sec motion ra |
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|
| Pri motion dec |
-003 |
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Sec motion dec |
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| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 206168 |
|
Constellation |
Cygnus |
|
SAO |
89883 |
|
HIP |
106940 |
|
| Tycho2 |
2717-00007-1 |
|
Gaia DR2 |
1849716176710461184 |
|
HD |
206168 |
|
ADS |
15182 |
|
| BD |
BD+29 4474 |
|
Distance |
202.84 |
|
Distance ly |
661.66 |
|
ORBITAL ELEMENTS
| Period (P) | 138.7y | |
Periastron (T) | 1999.56y | |
Semi-major axis (a) | 0.198a | |
| Eccentricity (e) | 0.549 | |
Inclination (i) | 152.7° | |
Longitude of periastron (ω) | 233.7° | |
| Node (Ω) | 42.8° | |
Notes | n | |
Reference | Doc2011b | |
| Equinox | 2000 | |
Last observation | 2010 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
167.5 |
0.082 |
| 2001 |
156.2 |
0.082 |
| 2002 |
145.0 |
0.083 |
| 2003 |
134.2 |
0.085 |
| 2004 |
124.1 |
0.088 |
| 2005 |
114.9 |
0.093 |
| 2006 |
106.6 |
0.098 |
| 2007 |
99.2 |
0.104 |
| 2008 |
92.7 |
0.111 |
| 2009 |
86.9 |
0.118 |
| 2010 |
81.8 |
0.124 |
| 2011 |
77.1 |
0.131 |
| 2012 |
73.0 |
0.138 |
| 2013 |
69.2 |
0.145 |
| 2014 |
65.7 |
0.151 |
| 2015 |
62.6 |
0.158 |
| 2016 |
59.6 |
0.164 |
| 2017 |
56.9 |
0.170 |
| 2018 |
54.4 |
0.176 |
| 2019 |
52.0 |
0.181 |
| 2020 |
49.8 |
0.187 |
| 2021 |
47.7 |
0.192 |
| 2022 |
45.7 |
0.197 |
| 2023 |
43.8 |
0.202 |
| 2024 |
42.0 |
0.207 |
| 2025 |
40.3 |
0.212 |
| 2026 |
38.6 |
0.216 |
| 2027 |
37.0 |
0.220 |
| 2028 |
35.5 |
0.224 |
| 2029 |
34.0 |
0.228 |
| 2030 |
32.6 |
0.232 |
|
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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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