21551-3148 I 1449 (HD 208166)
21h 55m 05.58s -31° 47' 47.8" P.A. 268.00 sep 0.3 mag 10.03,10.27 Sp G3/5V dist. 78.74 pc (256.85 l.y.)
| Coord 2000 |
21551-3148 |
|
Discov num |
I 1449 |
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Comp |
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Coord arcsec 2000 |
21 55 05.58 -31 47 47.8 |
|
| Date first |
1925 |
|
Date last |
2017 |
|
Obs |
11 |
|
| Pa first |
280 |
|
Pa last |
267.9 |
|
P.A. Now (θ) |
267.9° |
|
| Sep first |
0.3 |
|
Sep last |
0.27 |
|
Sep. Now (ρ) |
0.27" |
|
| Mag pri |
10.03 |
|
Mag sec |
10.27 |
|
delta mag (ΔM) |
0.24 |
|
Spectral class |
G3/5V (yellow) |
|
| Pri motion ra |
-004 |
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Sec motion ra |
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| Pri motion dec |
+017 |
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Sec motion dec |
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| Notes |
O
(Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 208166 |
|
Constellation |
Piscis Austrinus |
|
SAO |
213391 |
|
HIP |
108184 |
|
| Tycho2 |
7488-01454-1 |
|
HD |
208166 |
|
CD |
CD-3216809 |
|
CP |
CP-32 6434 |
|
| Distance |
78.74 |
|
Distance ly |
256.85 |
|
ORBITAL ELEMENTS
| Period (P) | 87.7y | |
Periastron (T) | 1998.61y | |
Semi-major axis (a) | 0.301a | |
| Eccentricity (e) | 0.759 | |
Inclination (i) | 120° | |
Longitude of periastron (ω) | 84.1° | |
| Node (Ω) | 126.3° | |
Notes | | |
Reference | Doc2019d | |
| Equinox | 2000 | |
Last observation | 2017 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
329.4 |
0.074 |
| 2001 |
314.6 |
0.109 |
| 2002 |
306.5 |
0.137 |
| 2003 |
301.1 |
0.160 |
| 2004 |
296.9 |
0.179 |
| 2005 |
293.4 |
0.194 |
| 2006 |
290.3 |
0.207 |
| 2007 |
287.7 |
0.218 |
| 2008 |
285.2 |
0.227 |
| 2009 |
282.9 |
0.235 |
| 2010 |
280.8 |
0.242 |
| 2011 |
278.8 |
0.248 |
| 2012 |
276.9 |
0.254 |
| 2013 |
275.0 |
0.258 |
| 2014 |
273.2 |
0.262 |
| 2015 |
271.5 |
0.266 |
| 2016 |
269.8 |
0.269 |
| 2017 |
268.1 |
0.271 |
| 2018 |
266.5 |
0.273 |
| 2019 |
264.9 |
0.275 |
| 2020 |
263.3 |
0.277 |
| 2021 |
261.7 |
0.278 |
| 2022 |
260.2 |
0.279 |
| 2023 |
258.6 |
0.280 |
| 2024 |
257.1 |
0.280 |
| 2025 |
255.6 |
0.281 |
| 2026 |
254.0 |
0.281 |
| 2027 |
252.5 |
0.281 |
| 2028 |
251.0 |
0.281 |
| 2029 |
249.4 |
0.281 |
| 2030 |
247.9 |
0.280 |
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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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