20471+2525 BU 364 (HD 198057)
20h 47m 03.56s +25° 24' 49.3" P.A. 75.00 sep 0.7 mag 9.00,9.12 Sp G5
Coord 2000 |
20471+2525 |
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Discov num |
BU 364 |
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Comp |
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Coord arcsec 2000 |
20 47 03.56 +25 24 49.3 |
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Date first |
1874 |
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Date last |
2016 |
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Obs |
76 |
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Pa first |
38 |
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Pa last |
75.3 |
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P.A. Now (θ) |
75.3° |
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Sep first |
1.0 |
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Sep last |
0.731 |
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Sep. Now (ρ) |
0.731" |
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Mag pri |
9.00 |
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Mag sec |
9.12 |
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delta mag (ΔM) |
0.12 |
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Spectral class |
G5 (yellow) |
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Pri motion ra |
-025 |
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Sec motion ra |
-025 |
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Pri motion dec |
-049 |
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Sec motion dec |
-049 |
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Notes |
O
(Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
Name |
HD 198057 |
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Constellation |
Vulpecula |
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Tycho2 |
2174-01913-1 |
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Gaia DR2 |
1843762497341672320 |
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HD |
198057 |
|
ADS |
14286 |
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ORBITAL ELEMENTS
Period (P) | 856.1062y | ± 410.4471 |
Periastron (T) | 2067.136y | ± 41.9511 |
Semi-major axis (a) | 1.29945a | ± 0.51201 |
Eccentricity (e) | 0.65375 | ± 0.28364 |
Inclination (i) | 59.674° | ± 13.165 |
Longitude of periastron (ω) | 108.976° | ± 43.173 |
Node (Ω) | 64.075° | ± 21.034 |
Notes | | |
Reference | Izm2019 | |
Equinox | | |
Last observation | 2013 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
66.4 |
0.885 |
2001 |
66.8 |
0.877 |
2002 |
67.1 |
0.868 |
2003 |
67.5 |
0.859 |
2004 |
67.9 |
0.850 |
2005 |
68.3 |
0.841 |
2006 |
68.6 |
0.831 |
2007 |
69.0 |
0.822 |
2008 |
69.4 |
0.813 |
2009 |
69.9 |
0.803 |
2010 |
70.3 |
0.793 |
2011 |
70.7 |
0.783 |
2012 |
71.2 |
0.773 |
2013 |
71.6 |
0.763 |
2014 |
72.1 |
0.753 |
2015 |
72.6 |
0.742 |
2016 |
73.1 |
0.731 |
2017 |
73.6 |
0.721 |
2018 |
74.1 |
0.710 |
2019 |
74.7 |
0.699 |
2020 |
75.3 |
0.688 |
2021 |
75.8 |
0.676 |
2022 |
76.4 |
0.665 |
2023 |
77.1 |
0.653 |
2024 |
77.7 |
0.641 |
2025 |
78.4 |
0.629 |
2026 |
79.1 |
0.617 |
2027 |
79.8 |
0.605 |
2028 |
80.6 |
0.593 |
2029 |
81.4 |
0.580 |
2030 |
82.2 |
0.568 |
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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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