21135+0713 BU 270 AB
21h 13m 27.24s +07° 13' 04.9" P.A. 342.00 sep 0.4 mag 7.42,9.40 Sp A7V dist. 95.6 pc (311.85 l.y.)
| Coord 2000 |
21135+0713 |
|
Discov num |
BU 270 |
|
Comp |
AB |
|
Coord arcsec 2000 |
21 13 27.24 +07 13 04.9 |
|
| Date first |
1875 |
|
Date last |
2021 |
|
Obs |
50 |
|
| Pa first |
355 |
|
Pa last |
342.4 |
|
P.A. Now (θ) |
341.3° |
|
| Sep first |
0.6 |
|
Sep last |
0.435 |
|
Sep. Now (ρ) |
0.366" |
|
| Mag pri |
7.42 |
|
Mag sec |
9.40 |
|
delta mag (ΔM) |
1.98 |
|
Spectral class |
A7V (white) |
|
| Pri motion ra |
+028 |
|
Sec motion ra |
+028 |
|
| Pri motion dec |
-010 |
|
Sec motion dec |
-010 |
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
21135+0713 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
|
126625 |
21 13 27 +07 13 05 |
BU 270 AB |
2021 |
50 |
342 |
0.4 |
7.42 |
9.40 |
1.98 |
Y |
<=== |
| Show |
|
126625 |
21 13 27 +07 13 05 |
BU 270 AB,C |
2014 |
19 |
26 |
30.8 |
7.25 |
14.01 |
6.76 |
|
|
| Show |
HD 202093 |
126625 |
21 13 27 +07 13 05 |
S 781 AB,D |
2014 |
30 |
172 |
184.1 |
7.25 |
7.17 |
0.08 |
|
|
Quadruple system
5 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Constellation |
Equuleus |
|
SAO |
126625 |
|
HIP |
104767 |
|
Tycho2 |
0539-00437-1 |
|
| Gaia DR2 |
1739882769050548608 |
|
HD |
202073 |
|
GC |
29667 |
|
ADS |
14759 |
|
| BD |
BD+06 4776 |
|
Distance |
95.6 |
|
Distance ly |
311.85 |
|
ORBITAL ELEMENTS
| Period (P) | 106.78y | |
Periastron (T) | 1931.26y | |
Semi-major axis (a) | 0.407a | |
| Eccentricity (e) | 0.646 | |
Inclination (i) | 102.7° | |
Longitude of periastron (ω) | 331.8° | |
| Node (Ω) | 166.7° | |
Notes | n | |
Reference | Msn2017a | |
| Equinox | 2000 | |
Last observation | 2008 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
349.6 |
0.614 |
| 2001 |
349.4 |
0.611 |
| 2002 |
349.1 |
0.608 |
| 2003 |
348.9 |
0.604 |
| 2004 |
348.6 |
0.599 |
| 2005 |
348.3 |
0.594 |
| 2006 |
348.1 |
0.588 |
| 2007 |
347.8 |
0.581 |
| 2008 |
347.5 |
0.574 |
| 2009 |
347.2 |
0.566 |
| 2010 |
346.9 |
0.557 |
| 2011 |
346.6 |
0.548 |
| 2012 |
346.3 |
0.538 |
| 2013 |
346.0 |
0.527 |
| 2014 |
345.6 |
0.515 |
| 2015 |
345.3 |
0.502 |
| 2016 |
344.9 |
0.489 |
| 2017 |
344.5 |
0.474 |
| 2018 |
344.0 |
0.459 |
| 2019 |
343.6 |
0.443 |
| 2020 |
343.1 |
0.425 |
| 2021 |
342.5 |
0.406 |
| 2022 |
341.9 |
0.387 |
| 2023 |
341.3 |
0.366 |
| 2024 |
340.5 |
0.343 |
| 2025 |
339.7 |
0.319 |
| 2026 |
338.7 |
0.294 |
| 2027 |
337.5 |
0.267 |
| 2028 |
336.0 |
0.239 |
| 2029 |
334.2 |
0.209 |
| 2030 |
331.6 |
0.177 |
| 2031 |
328.0 |
0.144 |
| 2032 |
322.0 |
0.109 |
| 2033 |
310.5 |
0.075 |
| 2034 |
282.6 |
0.046 |
| 2035 |
228.1 |
0.043 |
| 2036 |
194.7 |
0.068 |
| 2037 |
181.0 |
0.100 |
| 2038 |
173.7 |
0.127 |
| 2039 |
168.6 |
0.146 |
| 2040 |
164.5 |
0.155 |
| 2041 |
160.7 |
0.156 |
| 2042 |
156.7 |
0.150 |
| 2043 |
152.2 |
0.140 |
| 2044 |
147.0 |
0.127 |
| 2045 |
140.4 |
0.113 |
| 2046 |
132.0 |
0.099 |
| 2047 |
121.1 |
0.087 |
| 2048 |
107.1 |
0.078 |
| 2049 |
90.6 |
0.074 |
| 2050 |
73.7 |
0.076 |
|
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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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