21198-2621 BU 271 AB (HD 202940)
21h 19m 45.62s -26° 21' 10.3" P.A. 24.00 sep 0.6 mag 6.73,9.76 Sp G5V dist. 17.97 pc (58.62 l.y.)
| Coord 2000 |
21198-2621 |
|
Discov num |
BU 271 |
|
Comp |
AB |
|
Coord arcsec 2000 |
21 19 45.62 -26 21 10.3 |
|
| Date first |
1874 |
|
Date last |
2021 |
|
Obs |
58 |
|
| Pa first |
250 |
|
Pa last |
24.2 |
|
P.A. Now (θ) |
31.7° |
|
| Sep first |
1.8 |
|
Sep last |
0.642 |
|
Sep. Now (ρ) |
0.678" |
|
| Mag pri |
6.73 |
|
Mag sec |
9.76 |
|
delta mag (ΔM) |
3.03 |
|
Spectral class |
G5V (yellow) |
|
| Pri motion ra |
-582 |
|
Sec motion ra |
-541 |
|
| Pri motion dec |
-358 |
|
Sec motion dec |
-336 |
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
rPM=0.068 (< 0.3, Physical double)
This double is physical.
21198-2621 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
HD 202940 |
190236 |
21 19 46 -26 21 10 |
BU 271 AB |
2021 |
58 |
24 |
0.6 |
6.73 |
9.76 |
3.03 |
Y |
<=== |
| Show |
|
190236 |
21 19 46 -26 21 10 |
BU 271 AC |
1999 |
5 |
67 |
141.7 |
6.73 |
14.35 |
7.62 |
|
|
| Show |
|
190236 |
21 19 46 -26 21 10 |
BU 271 AD |
1999 |
3 |
61 |
298.6 |
6.73 |
12.15 |
5.42 |
|
|
| Show |
|
190236 |
21 19 46 -26 21 10 |
BU 271 AE |
1999 |
3 |
32 |
180.4 |
6.73 |
13.82 |
7.09 |
|
|
Quintuple system
5 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 202940 |
|
Constellation |
Capricornus |
|
SAO |
190236 |
|
HIP |
105312 |
|
| Tycho2 |
6945-00785-1 |
|
HD |
202940 |
|
HR |
8148 |
|
GC |
29832 |
|
| ADS |
14847 |
|
GL |
Gl 825.4A |
|
CD |
CD-2615541 |
|
CP |
CP-26 7193 |
|
| Distance |
17.97 |
|
Distance ly |
58.62 |
|
ORBITAL ELEMENTS
| Period (P) | 189.1y | ± 4.5 |
Periastron (T) | 1841.48y | ± 4.06 |
Semi-major axis (a) | 2.159a | ± 0.013 |
| Eccentricity (e) | 0.631 | ± 0.021 |
Inclination (i) | 65.2° | ± 0.4 |
Longitude of periastron (ω) | 190.5° | ± 3.8 |
| Node (Ω) | 244.7° | ± 1.3 |
Notes | n | |
Reference | Tok2020e | |
| Equinox | | |
Last observation | | |
Grade | 3 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
278.7 |
1.440 |
| 2001 |
280.2 |
1.381 |
| 2002 |
281.7 |
1.322 |
| 2003 |
283.5 |
1.263 |
| 2004 |
285.4 |
1.203 |
| 2005 |
287.5 |
1.144 |
| 2006 |
289.8 |
1.084 |
| 2007 |
292.4 |
1.025 |
| 2008 |
295.3 |
0.967 |
| 2009 |
298.6 |
0.910 |
| 2010 |
302.3 |
0.855 |
| 2011 |
306.5 |
0.802 |
| 2012 |
311.3 |
0.753 |
| 2013 |
316.7 |
0.708 |
| 2014 |
322.8 |
0.668 |
| 2015 |
329.7 |
0.634 |
| 2016 |
337.2 |
0.609 |
| 2017 |
345.2 |
0.592 |
| 2018 |
353.6 |
0.585 |
| 2019 |
2.0 |
0.588 |
| 2020 |
10.2 |
0.601 |
| 2021 |
17.9 |
0.621 |
| 2022 |
25.1 |
0.647 |
| 2023 |
31.7 |
0.678 |
| 2024 |
37.7 |
0.710 |
| 2025 |
43.2 |
0.741 |
| 2026 |
48.3 |
0.769 |
| 2027 |
53.0 |
0.790 |
| 2028 |
57.5 |
0.803 |
| 2029 |
62.0 |
0.806 |
| 2030 |
66.5 |
0.797 |
|
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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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