21251+0923 BU 164 AB
21h 25m 05.66s +09° 23' 02.6" P.A. 93.00 sep 0.1 mag 8.17,8.30 Sp A5IV-V dist. 136.05 pc (443.8 l.y.)
| Coord 2000 |
21251+0923 |
|
Discov num |
BU 164 |
|
Comp |
AB |
|
Coord arcsec 2000 |
21 25 05.66 +09 23 02.6 |
|
| Date first |
1873 |
|
Date last |
2021 |
|
Obs |
72 |
|
| Pa first |
255 |
|
Pa last |
93.4 |
|
P.A. Now (θ) |
93.4° |
|
| Sep first |
0.7 |
|
Sep last |
0.127 |
|
Sep. Now (ρ) |
0.127" |
|
| Mag pri |
8.17 |
|
Mag sec |
8.30 |
|
delta mag (ΔM) |
0.13 |
|
Spectral class |
A5IV-V (white) |
|
| Pri motion ra |
+023 |
|
Sec motion ra |
|
|
| Pri motion dec |
+006 |
|
Sec motion dec |
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|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
21251+0923 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
|
126783 |
21 25 06 +09 23 03 |
BU 164 AB |
2021 |
72 |
93 |
0.1 |
8.17 |
8.30 |
0.13 |
Y |
<=== |
| Show |
HD 203943 |
126783 |
21 25 06 +09 23 03 |
STF 2793 AB,C |
2014 |
59 |
241 |
26.4 |
7.44 |
8.98 |
1.54 |
|
|
Triple system
4 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Constellation |
Equuleus |
|
SAO |
126783 |
|
HIP |
105747 |
|
Tycho2 |
1110-02259-1 |
|
| Gaia DR2 |
1742076603985458304 |
|
HD |
203943 |
|
GC |
29991 |
|
ADS |
14954 |
|
| BD |
BD+08 4671 |
|
Distance |
136.05 |
|
Distance ly |
443.8 |
|
ORBITAL ELEMENTS
| Period (P) | 361.54y | |
Periastron (T) | 2023.74y | |
Semi-major axis (a) | 0.555a | |
| Eccentricity (e) | 0.875 | |
Inclination (i) | 104.5° | |
Longitude of periastron (ω) | 47.7° | |
| Node (Ω) | 79.3° | |
Notes | n | |
Reference | Zir2010 | |
| Equinox | 2000 | |
Last observation | 2008 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
179.3 |
0.101 |
| 2001 |
175.6 |
0.097 |
| 2002 |
171.5 |
0.094 |
| 2003 |
167.1 |
0.091 |
| 2004 |
162.5 |
0.088 |
| 2005 |
157.6 |
0.086 |
| 2006 |
152.6 |
0.085 |
| 2007 |
147.4 |
0.084 |
| 2008 |
142.1 |
0.084 |
| 2009 |
136.8 |
0.084 |
| 2010 |
131.6 |
0.085 |
| 2011 |
126.5 |
0.086 |
| 2012 |
121.6 |
0.088 |
| 2013 |
116.8 |
0.090 |
| 2014 |
112.3 |
0.092 |
| 2015 |
108.0 |
0.094 |
| 2016 |
103.9 |
0.096 |
| 2017 |
99.9 |
0.098 |
| 2018 |
96.1 |
0.099 |
| 2019 |
92.3 |
0.099 |
| 2020 |
88.4 |
0.097 |
| 2021 |
84.2 |
0.092 |
| 2022 |
79.3 |
0.082 |
| 2023 |
72.5 |
0.065 |
| 2024 |
59.1 |
0.042 |
| 2025 |
11.6 |
0.021 |
| 2026 |
300.2 |
0.033 |
| 2027 |
281.1 |
0.060 |
| 2028 |
274.1 |
0.087 |
| 2029 |
270.3 |
0.113 |
| 2030 |
267.9 |
0.136 |
| 2031 |
266.1 |
0.158 |
| 2032 |
264.8 |
0.178 |
| 2033 |
263.8 |
0.198 |
| 2034 |
262.9 |
0.216 |
| 2035 |
262.1 |
0.233 |
| 2036 |
261.5 |
0.249 |
| 2037 |
260.9 |
0.265 |
| 2038 |
260.4 |
0.279 |
| 2039 |
260.0 |
0.293 |
| 2040 |
259.6 |
0.307 |
| 2041 |
259.2 |
0.320 |
| 2042 |
258.8 |
0.333 |
| 2043 |
258.5 |
0.345 |
| 2044 |
258.2 |
0.356 |
| 2045 |
257.9 |
0.367 |
| 2046 |
257.7 |
0.378 |
| 2047 |
257.4 |
0.389 |
| 2048 |
257.2 |
0.399 |
| 2049 |
256.9 |
0.409 |
| 2050 |
256.7 |
0.419 |
|
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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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