21080+0509 STT 527 (HD 201221)
21h 08m 00.68s +05° 09' 06.0" P.A. 114.00 sep 0.4 mag 7.14,8.14 Sp A2V dist. 219.78 pc (716.92 l.y.)
Coord 2000 |
21080+0509 |
|
Discov num |
STT 527 |
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Comp |
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Coord arcsec 2000 |
21 08 00.68 +05 09 06.0 |
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Date first |
1846 |
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Date last |
2016 |
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Obs |
84 |
|
Pa first |
297 |
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Pa last |
113.9 |
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P.A. Now (θ) |
113.9° |
|
Sep first |
0.3 |
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Sep last |
0.416 |
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Sep. Now (ρ) |
0.416" |
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Mag pri |
7.14 |
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Mag sec |
8.14 |
|
delta mag (ΔM) |
1 |
|
Spectral class |
A2V (white) |
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Pri motion ra |
-016 |
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Sec motion ra |
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Pri motion dec |
-010 |
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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 201221 |
|
Constellation |
Equuleus |
|
SAO |
126562 |
|
HIP |
104324 |
|
Tycho2 |
0535-02156-1 |
|
Gaia DR2 |
1733031127982160640 |
|
HD |
201221 |
|
GC |
29538 |
|
ADS |
14666 |
|
BD |
BD+04 4615 |
|
Distance |
219.78 |
|
Distance ly |
716.92 |
|
ORBITAL ELEMENTS
Period (P) | 561.15y | |
Periastron (T) | 1950.18y | |
Semi-major axis (a) | 0.5576a | |
Eccentricity (e) | 0.4192 | |
Inclination (i) | 117.09° | |
Longitude of periastron (ω) | 240.24° | |
Node (Ω) | 91.3° | |
Notes | | |
Reference | Pop1995d | |
Equinox | 2000 | |
Last observation | 1987 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
117.3 |
0.310 |
2001 |
116.5 |
0.317 |
2002 |
115.7 |
0.323 |
2003 |
114.9 |
0.329 |
2004 |
114.1 |
0.335 |
2005 |
113.4 |
0.341 |
2006 |
112.7 |
0.346 |
2007 |
112.0 |
0.352 |
2008 |
111.4 |
0.358 |
2009 |
110.7 |
0.364 |
2010 |
110.1 |
0.370 |
2011 |
109.5 |
0.375 |
2012 |
109.0 |
0.381 |
2013 |
108.4 |
0.386 |
2014 |
107.9 |
0.392 |
2015 |
107.3 |
0.397 |
2016 |
106.8 |
0.403 |
2017 |
106.3 |
0.408 |
2018 |
105.8 |
0.413 |
2019 |
105.3 |
0.418 |
2020 |
104.9 |
0.423 |
2021 |
104.4 |
0.428 |
2022 |
104.0 |
0.433 |
2023 |
103.5 |
0.438 |
2024 |
103.1 |
0.443 |
2025 |
102.7 |
0.448 |
2026 |
102.3 |
0.453 |
2027 |
101.9 |
0.457 |
2028 |
101.5 |
0.462 |
2029 |
101.1 |
0.466 |
2030 |
100.7 |
0.471 |
2031 |
100.4 |
0.475 |
2032 |
100.0 |
0.480 |
2033 |
99.7 |
0.484 |
2034 |
99.3 |
0.488 |
2035 |
99.0 |
0.492 |
2036 |
98.6 |
0.496 |
2037 |
98.3 |
0.500 |
2038 |
98.0 |
0.504 |
2039 |
97.7 |
0.508 |
2040 |
97.3 |
0.512 |
2041 |
97.0 |
0.516 |
2042 |
96.7 |
0.519 |
2043 |
96.4 |
0.523 |
2044 |
96.1 |
0.526 |
2045 |
95.8 |
0.530 |
2046 |
95.5 |
0.533 |
2047 |
95.2 |
0.537 |
2048 |
95.0 |
0.540 |
2049 |
94.7 |
0.543 |
2050 |
94.4 |
0.547 |
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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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