21255+0203 A 2289 AB
21h 25m 30.78s +02° 02' 35.0" P.A. 334.00 sep 0.1 mag 7.82,9.27 Sp A1III dist. 296.74 pc (967.97 l.y.)
| Coord 2000 |
21255+0203 |
|
Discov num |
A 2289 |
|
Comp |
AB |
|
Coord arcsec 2000 |
21 25 30.78 +02 02 35.0 |
|
| Date first |
1910 |
|
Date last |
2017 |
|
Obs |
18 |
|
| Pa first |
304 |
|
Pa last |
333.8 |
|
P.A. Now (θ) |
327.4° |
|
| Sep first |
0.3 |
|
Sep last |
0.103 |
|
Sep. Now (ρ) |
0.151" |
|
| Mag pri |
7.82 |
|
Mag sec |
9.27 |
|
delta mag (ΔM) |
1.45 |
|
Spectral class |
A1III (white) |
|
| Pri motion ra |
+007 |
|
Sec motion ra |
|
|
| Pri motion dec |
-019 |
|
Sec motion dec |
|
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
21255+0203 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
|
126787 |
21 25 31 +02 02 35 |
A 2289 AB |
2017 |
18 |
334 |
0.1 |
7.82 |
9.27 |
1.45 |
Y |
<=== |
| Show |
HD 203993 |
126787 |
21 25 31 +02 02 35 |
STT 439 AB,C |
2018 |
22 |
222 |
14.6 |
7.53 |
11.33 |
3.80 |
|
|
Triple system
4 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Constellation |
Aquarius |
|
SAO |
126787 |
|
HIP |
105792 |
|
Tycho2 |
0533-01002-1 |
|
| Gaia DR2 |
2691752864506307456 |
|
HD |
203993 |
|
ADS |
14960 |
|
BD |
BD+01 4477 |
|
| Distance |
296.74 |
|
Distance ly |
967.97 |
|
ORBITAL ELEMENTS
| Period (P) | 159.45y | ± 21.43 |
Periastron (T) | 2008.15y | ± 1.85 |
Semi-major axis (a) | 0.207a | ± 0.013 |
| Eccentricity (e) | 0.652 | ± 0.025 |
Inclination (i) | 111° | ± 3.1 |
Longitude of periastron (ω) | 51.1° | ± 7.1 |
| Node (Ω) | 141.1° | ± 4.2 |
Notes | n | |
Reference | Tok2015c | |
| Equinox | 2000 | |
Last observation | 2014 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
154.0 |
0.096 |
| 2001 |
151.1 |
0.095 |
| 2002 |
148.1 |
0.093 |
| 2003 |
145.0 |
0.090 |
| 2004 |
141.5 |
0.085 |
| 2005 |
137.6 |
0.079 |
| 2006 |
133.0 |
0.071 |
| 2007 |
127.0 |
0.062 |
| 2008 |
118.7 |
0.051 |
| 2009 |
105.9 |
0.040 |
| 2010 |
84.8 |
0.031 |
| 2011 |
53.7 |
0.028 |
| 2012 |
24.3 |
0.033 |
| 2013 |
5.4 |
0.043 |
| 2014 |
354.2 |
0.055 |
| 2015 |
347.1 |
0.067 |
| 2016 |
342.2 |
0.079 |
| 2017 |
338.6 |
0.091 |
| 2018 |
335.8 |
0.103 |
| 2019 |
333.5 |
0.113 |
| 2020 |
331.6 |
0.124 |
| 2021 |
330.0 |
0.133 |
| 2022 |
328.6 |
0.142 |
| 2023 |
327.4 |
0.151 |
| 2024 |
326.3 |
0.159 |
| 2025 |
325.3 |
0.167 |
| 2026 |
324.4 |
0.174 |
| 2027 |
323.6 |
0.181 |
| 2028 |
322.8 |
0.187 |
| 2029 |
322.1 |
0.193 |
| 2030 |
321.4 |
0.199 |
|
|
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
|
|
|
|
|
|
|
|
Measures: green=micrometric, blue=interferometric, purple=photographic |
|
