21378-0751 MCA 68 AB (Bunda)
21h 37m 45.10s -07° 51' 15.1" P.A. 79.00 sep 0.0 mag 4.80,7.00 Sp A7V dist. 54.76 pc (178.63 l.y.)
| Coord 2000 |
21378-0751 |
|
Discov num |
MCA 68 |
|
Comp |
AB |
|
Coord arcsec 2000 |
21 37 45.10 -07 51 15.1 |
|
| Date first |
1977 |
|
Date last |
2008 |
|
Obs |
5 |
|
| Pa first |
123 |
|
Pa last |
78.5 |
|
P.A. Now (θ) |
78.5° |
|
| Sep first |
0.0 |
|
Sep last |
0.043 |
|
Sep. Now (ρ) |
0.043" |
|
| Mag pri |
4.80 |
|
Mag sec |
7.00 |
|
delta mag (ΔM) |
2.2 |
|
Spectral class |
A7V (white) |
|
| Pri motion ra |
+114 |
|
Sec motion ra |
|
|
| Pri motion dec |
-025 |
|
Sec motion dec |
|
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
21378-0751 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
Bunda |
145537 |
21 37 45 -07 51 15 |
MCA 68 AB |
2008 |
5 |
79 |
0.0 |
4.80 |
7.00 |
2.20 |
Y |
<=== |
| Show |
Xi Aqr |
145537 |
21 37 45 -07 51 15 |
DRS 67 AC |
2014 |
3 |
222 |
375.5 |
4.70 |
14.00 |
9.30 |
|
|
Triple system
3 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Common name |
Bunda |
|
Constellation |
Aquarius |
|
SAO |
145537 |
|
HIP |
106786 |
|
| Tycho2 |
5787-01291-1 |
|
Gaia DR2 |
2667335258168556928 |
|
HD |
205767 |
|
HR |
8264 |
|
| GC |
30268 |
|
BD |
BD-08 5701 |
|
Bayer |
Xi Aquarii |
|
Bayer name |
Xi Aqr |
|
| Flamsteed |
23 Aquarii |
|
Flamsteed name |
23 Aqr |
|
FK5 |
1569 |
|
Distance |
54.76 |
|
| Distance ly |
178.63 |
|
Bayer greek |
ξ Aqr |
|
| Meaning |
French proposal; named after Belenus, a god of light, the Sun and of health in Gaulish mythology. |
|
ORBITAL ELEMENTS
| Period (P) | 25.5y | ± 3 |
Periastron (T) | 1970.4y | ± 2.5 |
Semi-major axis (a) | 0.28a | ± 0.03 |
| Eccentricity (e) | 0.6 | ± 0.2 |
Inclination (i) | 95° | ± 12 |
Longitude of periastron (ω) | 270° | ± 36 |
| Node (Ω) | 300° | ± 17 |
Notes | n | |
Reference | Gon2002b | |
| Equinox | | |
Last observation | | |
Grade | 9 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
296.0 |
0.224 |
| 2001 |
294.4 |
0.217 |
| 2002 |
292.7 |
0.202 |
| 2003 |
290.6 |
0.180 |
| 2004 |
287.8 |
0.155 |
| 2005 |
283.9 |
0.127 |
| 2006 |
277.6 |
0.097 |
| 2007 |
265.9 |
0.068 |
| 2008 |
239.9 |
0.045 |
| 2009 |
192.8 |
0.041 |
| 2010 |
159.7 |
0.060 |
| 2011 |
145.1 |
0.088 |
| 2012 |
137.7 |
0.118 |
| 2013 |
133.2 |
0.146 |
| 2014 |
130.2 |
0.173 |
| 2015 |
127.9 |
0.196 |
| 2016 |
126.1 |
0.213 |
| 2017 |
124.4 |
0.223 |
| 2018 |
122.9 |
0.222 |
| 2019 |
121.2 |
0.203 |
| 2020 |
118.8 |
0.154 |
| 2021 |
110.5 |
0.055 |
| 2022 |
306.0 |
0.079 |
| 2023 |
300.6 |
0.167 |
| 2024 |
298.4 |
0.209 |
| 2025 |
296.8 |
0.224 |
| 2026 |
295.2 |
0.222 |
| 2027 |
293.6 |
0.210 |
| 2028 |
291.7 |
0.191 |
| 2029 |
289.3 |
0.168 |
| 2030 |
286.0 |
0.141 |
|
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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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