20599+4016 HDS 2989 Da,Db
20h 58m 11.46s +40° 11' 29.0" P.A. 143.00 sep 0.1 mag 11.16,12.46 Sp M1 dist. 43.9 pc (143.2 l.y.)
| Coord 2000 |
20599+4016 |
|
Discov num |
HDS2989 |
|
Comp |
Da,Db |
|
Coord arcsec 2000 |
20 58 11.46 +40 11 29.0 |
|
| Date first |
1991 |
|
Date last |
2018 |
|
Obs |
11 |
|
| Pa first |
149 |
|
Pa last |
142.9 |
|
P.A. Now (θ) |
142.9° |
|
| Sep first |
0.3 |
|
Sep last |
0.141 |
|
Sep. Now (ρ) |
0.141" |
|
| Mag pri |
11.16 |
|
Mag sec |
12.46 |
|
delta mag (ΔM) |
1.3 |
|
Spectral class |
M1 (red) |
|
| Pri motion ra |
+231 |
|
Sec motion ra |
|
|
| Pri motion dec |
+201 |
|
Sec motion dec |
|
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
20599+4016 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
|
50331 |
20 59 55 +40 15 32 |
LSC 1 Aa1,2 |
2012 |
2 |
257 |
0.0 |
7.00 |
8.20 |
1.20 |
Y |
|
| Show |
|
50331 |
20 59 55 +40 15 32 |
COU 2431 Aa,Ab |
2018 |
12 |
205 |
2.2 |
6.66 |
10.80 |
4.14 |
|
|
| Show |
HD 200077 |
50331 |
20 59 55 +40 15 32 |
ENG 79 AB |
2003 |
10 |
219 |
165.9 |
6.66 |
9.76 |
3.10 |
|
|
| Show |
|
50331 |
20 59 55 +40 15 32 |
BUP 221 AC |
2003 |
9 |
154 |
210.3 |
6.66 |
9.71 |
3.05 |
|
|
| Show |
|
50331 |
20 59 55 +40 15 32 |
LEP 98 AD |
2016 |
8 |
258 |
999.9 |
6.66 |
10.90 |
4.24 |
|
|
| Show |
|
|
20 59 46 +40 13 24 |
BUP 221 BC |
2015 |
13 |
107 |
203.7 |
9.76 |
9.71 |
0.05 |
|
|
| Show |
|
|
21 00 03 +40 12 23 |
SEI 1363 CR |
2015 |
25 |
37 |
8.7 |
9.71 |
10.67 |
0.96 |
|
|
| Show |
|
|
20 58 11 +40 11 29 |
HDS 2989 Da,Db |
2018 |
11 |
143 |
0.1 |
11.16 |
12.46 |
1.30 |
Y |
<=== |
| Show |
|
|
20 58 11 +40 11 29 |
RAO 72 DE |
2012 |
3 |
118 |
19.8 |
11.00 |
15.80 |
4.80 |
|
|
Ninefold system
6 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Constellation |
Cygnus |
|
HIP |
103502 |
|
Tycho2 |
3171-01526-3 |
|
Gaia DR2 |
1873271430935980160 |
|
| Distance |
43.9 |
|
Distance ly |
143.2 |
|
ORBITAL ELEMENTS
| Period (P) | 212.7y | |
Periastron (T) | 2142.3y | |
Semi-major axis (a) | 0.94a | |
| Eccentricity (e) | 0.85 | |
Inclination (i) | 90.9° | |
Longitude of periastron (ω) | 270° | |
| Node (Ω) | 154.5° | |
Notes | n | |
Reference | Tok2019e | |
| Equinox | 2000 | |
Last observation | 2018 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
149.3 |
0.276 |
| 2001 |
149.2 |
0.269 |
| 2002 |
149.0 |
0.262 |
| 2003 |
148.8 |
0.255 |
| 2004 |
148.6 |
0.248 |
| 2005 |
148.4 |
0.240 |
| 2006 |
148.2 |
0.233 |
| 2007 |
148.0 |
0.226 |
| 2008 |
147.7 |
0.218 |
| 2009 |
147.4 |
0.211 |
| 2010 |
147.2 |
0.204 |
| 2011 |
146.8 |
0.196 |
| 2012 |
146.5 |
0.189 |
| 2013 |
146.1 |
0.181 |
| 2014 |
145.8 |
0.174 |
| 2015 |
145.3 |
0.166 |
| 2016 |
144.9 |
0.159 |
| 2017 |
144.3 |
0.151 |
| 2018 |
143.8 |
0.143 |
| 2019 |
143.1 |
0.136 |
| 2020 |
142.4 |
0.128 |
| 2021 |
141.6 |
0.121 |
| 2022 |
140.7 |
0.113 |
| 2023 |
139.7 |
0.106 |
| 2024 |
138.5 |
0.098 |
| 2025 |
137.1 |
0.090 |
| 2026 |
135.4 |
0.083 |
| 2027 |
133.5 |
0.076 |
| 2028 |
131.1 |
0.068 |
| 2029 |
128.1 |
0.061 |
| 2030 |
124.4 |
0.054 |
|
|
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
|
|
|
|
|
|
|
|
Measures: green=micrometric, blue=interferometric, purple=photographic |
|
