21308+4827 A 770 AB
21h 30m 48.00s +48° 27' 25.4" P.A. 143.00 sep 0.1 mag 7.99,7.99 Sp K0
Coord 2000 |
21308+4827 |
|
Discov num |
A 770 |
|
Comp |
AB |
|
Coord arcsec 2000 |
21 30 48.00 +48 27 25.4 |
|
Date first |
1928 |
|
Date last |
2018 |
|
Obs |
10 |
|
Pa first |
326 |
|
Pa last |
142.7 |
|
P.A. Now (θ) |
142.7° |
|
Sep first |
0.3 |
|
Sep last |
0.135 |
|
Sep. Now (ρ) |
0.135" |
|
Mag pri |
7.99 |
|
Mag sec |
7.99 |
|
delta mag (ΔM) |
0 |
|
Spectral class |
K0 (yellow-orange) |
|
Pri motion ra |
+018 |
|
Sec motion ra |
|
|
Pri motion dec |
-142 |
|
Sec motion dec |
|
|
Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
21308+4827 SYSTEM COMPONENTS
Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
Show |
|
|
21 30 48 +48 27 25 |
A 770 AB |
2018 |
10 |
143 |
0.1 |
7.99 |
7.99 |
0.00 |
Y |
<=== |
Show |
|
|
21 30 48 +48 27 25 |
A 770 AB,C |
2018 |
13 |
317 |
1.1 |
8.74 |
11.90 |
3.16 |
|
|
Show |
|
|
21 30 48 +48 27 25 |
A 770 AB,D |
2017 |
11 |
15 |
98.9 |
8.74 |
10.59 |
1.85 |
|
|
Show |
|
|
21 30 50 +48 28 59 |
A 770 DE |
2015 |
11 |
41 |
7.2 |
10.59 |
12.00 |
1.41 |
|
|
Quintuple system
6 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
Constellation |
Cygnus |
|
Tycho2 |
3594-01084-1 |
|
Gaia DR2 |
1978557468965457408 |
|
ADS |
15052 |
|
ORBITAL ELEMENTS
Period (P) | 146y | |
Periastron (T) | 1958.6y | |
Semi-major axis (a) | 0.307a | |
Eccentricity (e) | 0.2 | |
Inclination (i) | 89.5° | |
Longitude of periastron (ω) | 90° | |
Node (Ω) | 321.4° | |
Notes | n | |
Reference | Tok2019e | |
Equinox | 2000 | |
Last observation | 2018 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
141.7 |
0.278 |
2001 |
141.7 |
0.273 |
2002 |
141.8 |
0.268 |
2003 |
141.8 |
0.262 |
2004 |
141.8 |
0.256 |
2005 |
141.9 |
0.250 |
2006 |
141.9 |
0.243 |
2007 |
141.9 |
0.236 |
2008 |
142.0 |
0.229 |
2009 |
142.0 |
0.221 |
2010 |
142.1 |
0.213 |
2011 |
142.1 |
0.205 |
2012 |
142.1 |
0.197 |
2013 |
142.2 |
0.188 |
2014 |
142.3 |
0.179 |
2015 |
142.3 |
0.170 |
2016 |
142.4 |
0.161 |
2017 |
142.5 |
0.151 |
2018 |
142.6 |
0.142 |
2019 |
142.7 |
0.132 |
2020 |
142.8 |
0.122 |
2021 |
142.9 |
0.112 |
2022 |
143.1 |
0.102 |
2023 |
143.3 |
0.092 |
2024 |
143.6 |
0.081 |
2025 |
143.9 |
0.071 |
2026 |
144.4 |
0.060 |
2027 |
145.1 |
0.050 |
2028 |
146.1 |
0.039 |
2029 |
147.9 |
0.028 |
2030 |
151.9 |
0.018 |
|
|
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
|
|
|
|
|
|
|
|
Measures: green=micrometric, blue=interferometric, purple=photographic |
|