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 |
|
Discov num |
WSI 8 |
|
Comp |
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Coord arcsec 2000 |
21 53 54.79 +28 20 32.0 |
|
| Date first |
1998 |
|
Date last |
2011 |
|
Obs |
3 |
|
| Pa first |
157 |
|
Pa last |
142.2 |
|
P.A. Now (θ) |
142.2° |
|
| Sep first |
0.3 |
|
Sep last |
0.111 |
|
Sep. Now (ρ) |
0.111" |
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| Mag pri |
6.79 |
|
Mag sec |
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delta mag (ΔM) |
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|
Spectral class |
A2 (white) |
|
| 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 |
|
Constellation |
Pegasus |
|
SAO |
90085 |
|
HIP |
108084 |
|
| Tycho2 |
2214-01318-1 |
|
Gaia DR2 |
1896311937602804992 |
|
HD |
208174 |
|
GC |
30661 |
|
| BD |
BD+27 4191 |
|
Distance |
104.6 |
|
Distance ly |
341.21 |
|
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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