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 |
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Discov num |
I 1449 |
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Comp |
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Coord arcsec 2000 |
21 55 05.58 -31 47 47.8 |
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Date first |
1925 |
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Date last |
2017 |
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Obs |
11 |
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Pa first |
280 |
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Pa last |
267.9 |
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P.A. Now (θ) |
267.9° |
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Sep first |
0.3 |
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Sep last |
0.27 |
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Sep. Now (ρ) |
0.27" |
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Mag pri |
10.03 |
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Mag sec |
10.27 |
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delta mag (ΔM) |
0.24 |
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Spectral class |
G3/5V (yellow) |
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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 |
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Constellation |
Piscis Austrinus |
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SAO |
213391 |
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HIP |
108184 |
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Tycho2 |
7488-01454-1 |
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HD |
208166 |
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CD |
CD-3216809 |
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CP |
CP-32 6434 |
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Distance |
78.74 |
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Distance ly |
256.85 |
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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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