21539+2821 WSI 8 (HD 208174)
21h 53m 54.79s +28° 20' 32.0" P.A. 142.00 sep 0.1 mag 6.79, Sp A2 dist. 104.6 pc (341.21 l.y.)
Coord 2000 |
21539+2821 |
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Discov num |
WSI 8 |
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Comp |
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Coord arcsec 2000 |
21 53 54.79 +28 20 32.0 |
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Date first |
1998 |
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Date last |
2011 |
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Obs |
3 |
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Pa first |
157 |
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Pa last |
142.2 |
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P.A. Now (θ) |
142.2° |
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Sep first |
0.3 |
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Sep last |
0.111 |
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Sep. Now (ρ) |
0.111" |
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Mag pri |
6.79 |
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Mag sec |
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delta mag (ΔM) |
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Spectral class |
A2 (white) |
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Pri motion ra |
-160 |
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Sec motion ra |
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Pri motion dec |
-114 |
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Sec motion dec |
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Notes |
N
O
(See Notes, Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
Name |
HD 208174 |
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Constellation |
Pegasus |
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SAO |
90085 |
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HIP |
108084 |
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Tycho2 |
2214-01318-1 |
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Gaia DR2 |
1896311937602804992 |
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HD |
208174 |
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GC |
30661 |
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BD |
BD+27 4191 |
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Distance |
104.6 |
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Distance ly |
341.21 |
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ORBITAL ELEMENTS
Period (P) | 831.1756d (2.28y) | ± 64.2443 |
Periastron (T) | 48177.7734d (1990.782y) | ± 97.9153 |
Semi-major axis (a) | 5.25m | ± 0.76 |
Eccentricity (e) | 0 | |
Inclination (i) | 35.63° | ± 17.36 |
Longitude of periastron (ω) | 0° | |
Node (Ω) | 67.41° | ± 38.98 |
Notes | n | |
Reference | HIP1997d | |
Equinox | | |
Last observation | 1991 | |
Grade | 9 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000-01-01 |
82.4 |
0.005 |
2001-01-01 |
244.5 |
0.005 |
2002-01-01 |
46.3 |
0.005 |
2003-01-01 |
206.2 |
0.005 |
2004-01-01 |
2.7 |
0.004 |
2005-01-01 |
156.4 |
0.004 |
2006-01-01 |
310.3 |
0.004 |
2007-01-01 |
107.1 |
0.005 |
2008-01-01 |
267.1 |
0.005 |
2009-01-01 |
69.0 |
0.005 |
2010-01-01 |
231.1 |
0.005 |
2011-01-01 |
31.6 |
0.005 |
2012-01-01 |
189.0 |
0.004 |
2013-01-01 |
343.3 |
0.004 |
2014-01-01 |
136.7 |
0.004 |
2015-01-01 |
292.7 |
0.005 |
2016-01-01 |
92.0 |
0.005 |
2017-01-01 |
253.5 |
0.005 |
2018-01-01 |
55.7 |
0.005 |
2019-01-01 |
216.8 |
0.005 |
2020-01-01 |
15.1 |
0.005 |
2021-01-01 |
170.0 |
0.004 |
2022-01-01 |
323.4 |
0.004 |
2023-01-01 |
118.5 |
0.005 |
2024-01-01 |
277.0 |
0.005 |
2025-01-01 |
78.1 |
0.005 |
2026-01-01 |
240.3 |
0.005 |
2027-01-01 |
41.8 |
0.005 |
2028-01-01 |
200.9 |
0.005 |
2029-01-01 |
356.7 |
0.004 |
2030-01-01 |
150.1 |
0.004 |
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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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