21088-0426 HDS 3013 Aa,Ab
21h 08m 45.51s -04° 25' 36.7" P.A. 326.00 sep 0.2 mag 9.64,12.14 Sp M1 dist. 27.09 pc (88.37 l.y.)
| Coord 2000 |
21088-0426 |
|
Discov num |
HDS3013 |
|
Comp |
Aa,Ab |
|
Coord arcsec 2000 |
21 08 45.51 -04 25 36.7 |
|
| Date first |
1991 |
|
Date last |
2021 |
|
Obs |
25 |
|
| Pa first |
162 |
|
Pa last |
326.1 |
|
P.A. Now (θ) |
307.5° |
|
| Sep first |
0.3 |
|
Sep last |
0.229 |
|
Sep. Now (ρ) |
0.268" |
|
| Mag pri |
9.64 |
|
Mag sec |
12.14 |
|
delta mag (ΔM) |
2.5 |
|
Spectral class |
M1 (red) |
|
| Pri motion ra |
-075 |
|
Sec motion ra |
|
|
| Pri motion dec |
-033 |
|
Sec motion dec |
|
|
| Notes |
O
(Orbital solution) |
|
This double is physical.
21088-0426 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
|
|
21 08 46 -04 25 37 |
HDS 3013 Aa,Ab |
2021 |
25 |
326 |
0.2 |
9.64 |
12.14 |
2.50 |
Y |
<=== |
| Show |
|
|
21 08 46 -04 25 37 |
VVO 18 AB |
2016 |
4 |
332 |
20.9 |
9.50 |
13.20 |
3.70 |
|
|
| Show |
|
|
21 08 46 -04 25 37 |
AMM 10 AC |
2003 |
1 |
262 |
4.4 |
6.40 |
17.80 |
11.40 |
|
|
| Show |
|
|
21 08 46 -04 25 37 |
AMM 10 AD |
2003 |
1 |
264 |
4.9 |
6.40 |
15.70 |
9.30 |
|
|
| Show |
|
|
21 08 46 -04 25 37 |
AMM 10 AE |
2003 |
1 |
2 |
12.9 |
6.40 |
17.50 |
11.10 |
|
|
| Show |
|
|
21 08 46 -04 25 37 |
AMM 10 AF |
2003 |
1 |
330 |
20.2 |
6.40 |
16.20 |
9.80 |
|
|
| Show |
|
|
21 08 46 -04 25 37 |
AMM 10 AG |
2003 |
1 |
311 |
21.9 |
6.40 |
16.50 |
10.10 |
|
|
Octuple system
7 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Constellation |
Aquarius |
|
HIP |
104383 |
|
Gaia DR2 |
6912161147450851840 |
|
GL |
Wo 9721A |
|
| BD |
BD-05 5480 |
|
Distance |
27.09 |
|
Distance ly |
88.37 |
|
ORBITAL ELEMENTS
| Period (P) | 25.04y | ± 0.04 |
Periastron (T) | 1994.31y | ± 0.04 |
Semi-major axis (a) | 317.9m | ± 1.6 |
| Eccentricity (e) | 0.549 | ± 0.003 |
Inclination (i) | 132.8° | ± 0.4 |
Longitude of periastron (ω) | 99.2° | ± 0.6 |
| Node (Ω) | 154.7° | ± 0.7 |
Notes | | |
Reference | Mit2021 | |
| Equinox | | |
Last observation | 2020 | |
Grade | 2 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
286.6 |
0.297 |
| 2001 |
277.5 |
0.305 |
| 2002 |
268.9 |
0.312 |
| 2003 |
260.6 |
0.318 |
| 2004 |
252.5 |
0.324 |
| 2005 |
244.8 |
0.329 |
| 2006 |
237.3 |
0.335 |
| 2007 |
230.1 |
0.340 |
| 2008 |
223.1 |
0.345 |
| 2009 |
216.2 |
0.349 |
| 2010 |
209.5 |
0.352 |
| 2011 |
202.9 |
0.352 |
| 2012 |
196.2 |
0.350 |
| 2013 |
189.3 |
0.343 |
| 2014 |
182.0 |
0.331 |
| 2015 |
174.0 |
0.311 |
| 2016 |
164.6 |
0.280 |
| 2017 |
152.2 |
0.234 |
| 2018 |
131.6 |
0.168 |
| 2019 |
80.9 |
0.102 |
| 2020 |
8.2 |
0.132 |
| 2021 |
337.2 |
0.198 |
| 2022 |
320.2 |
0.241 |
| 2023 |
307.5 |
0.268 |
| 2024 |
296.7 |
0.285 |
| 2025 |
287.0 |
0.297 |
| 2026 |
277.9 |
0.305 |
| 2027 |
269.2 |
0.312 |
| 2028 |
260.9 |
0.318 |
| 2029 |
252.8 |
0.323 |
| 2030 |
245.1 |
0.329 |
|
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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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