21426+4103 BU 688 AB
21h 42m 33.41s +41° 02' 51.0" P.A. 198.00 sep 0.4 mag 8.10,8.62 Sp F2V dist. 120.48 pc (393.01 l.y.)
| Coord 2000 |
21426+4103 |
|
Discov num |
BU 688 |
|
Comp |
AB |
|
Coord arcsec 2000 |
21 42 33.41 +41 02 51.0 |
|
| Date first |
1877 |
|
Date last |
2018 |
|
Obs |
80 |
|
| Pa first |
209 |
|
Pa last |
197.8 |
|
P.A. Now (θ) |
198.5° |
|
| Sep first |
0.3 |
|
Sep last |
0.406 |
|
Sep. Now (ρ) |
0.425" |
|
| Mag pri |
8.10 |
|
Mag sec |
8.62 |
|
delta mag (ΔM) |
0.52 |
|
Spectral class |
F2V (yellow-white) |
|
| Pri motion ra |
+026 |
|
Sec motion ra |
+026 |
|
| Pri motion dec |
-001 |
|
Sec motion dec |
-001 |
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
21426+4103 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
|
51212 |
21 42 33 +41 02 51 |
BU 688 AB |
2018 |
80 |
198 |
0.4 |
8.10 |
8.62 |
0.52 |
Y |
<=== |
| Show |
HD 206656 |
51212 |
21 42 33 +41 02 51 |
BU 688 AB,C |
2014 |
6 |
30 |
27.0 |
7.63 |
11.90 |
4.27 |
|
|
| Show |
|
51212 |
21 42 33 +41 02 51 |
FOX 9036 AB,D |
2014 |
5 |
306 |
46.7 |
8.85 |
13.78 |
4.93 |
|
|
Quadruple system
5 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Constellation |
Cygnus |
|
SAO |
51212 |
|
HIP |
107177 |
|
Tycho2 |
3188-00957-1 |
|
| HD |
206656 |
|
GC |
30402 |
|
ADS |
15251 |
|
BD |
BD+40 4617 |
|
| Distance |
120.48 |
|
Distance ly |
393.01 |
|
ORBITAL ELEMENTS
| Period (P) | 106.9y | |
Periastron (T) | 1947.53y | |
Semi-major axis (a) | 0.673a | |
| Eccentricity (e) | 0.986 | |
Inclination (i) | 95.9° | |
Longitude of periastron (ω) | 106.7° | |
| Node (Ω) | 182.8° | |
Notes | n | |
Reference | Jte2018 | |
| Equinox | 2000 | |
Last observation | 2017 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
201.9 |
0.403 |
| 2001 |
201.7 |
0.406 |
| 2002 |
201.6 |
0.409 |
| 2003 |
201.4 |
0.412 |
| 2004 |
201.2 |
0.414 |
| 2005 |
201.1 |
0.417 |
| 2006 |
200.9 |
0.419 |
| 2007 |
200.8 |
0.421 |
| 2008 |
200.6 |
0.422 |
| 2009 |
200.5 |
0.424 |
| 2010 |
200.4 |
0.425 |
| 2011 |
200.2 |
0.427 |
| 2012 |
200.1 |
0.428 |
| 2013 |
199.9 |
0.429 |
| 2014 |
199.8 |
0.429 |
| 2015 |
199.6 |
0.430 |
| 2016 |
199.5 |
0.430 |
| 2017 |
199.4 |
0.430 |
| 2018 |
199.2 |
0.429 |
| 2019 |
199.1 |
0.429 |
| 2020 |
198.9 |
0.428 |
| 2021 |
198.8 |
0.427 |
| 2022 |
198.6 |
0.426 |
| 2023 |
198.5 |
0.425 |
| 2024 |
198.4 |
0.423 |
| 2025 |
198.2 |
0.421 |
| 2026 |
198.1 |
0.419 |
| 2027 |
197.9 |
0.416 |
| 2028 |
197.8 |
0.413 |
| 2029 |
197.6 |
0.410 |
| 2030 |
197.4 |
0.407 |
|
|
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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