21543+1943 COU 432 BC
21h 54m 17.44s +19° 43' 05.3" P.A. 299.00 sep 0.1 mag 8.80,9.00 Sp K0III+.. dist. 37.61 pc (122.68 l.y.)
| Coord 2000 |
21543+1943 |
|
Discov num |
COU 432 |
|
Comp |
BC |
|
Coord arcsec 2000 |
21 54 17.44 +19 43 05.3 |
|
| Date first |
1969 |
|
Date last |
2021 |
|
Obs |
35 |
|
| Pa first |
29 |
|
Pa last |
299.1 |
|
P.A. Now (θ) |
299.1° |
|
| Sep first |
0.2 |
|
Sep last |
0.058 |
|
Sep. Now (ρ) |
0.058" |
|
| Mag pri |
8.80 |
|
Mag sec |
9.00 |
|
delta mag (ΔM) |
0.2 |
|
Spectral class |
K0III+.. (yellow-orange) |
|
| Pri motion ra |
-044 |
|
Sec motion ra |
|
|
| Pri motion dec |
-008 |
|
Sec motion dec |
|
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
21543+1943 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
HD 208202 |
107489 |
21 54 17 +19 43 05 |
STF 2841 A,BC |
2018 |
82 |
110 |
22.4 |
6.45 |
7.99 |
1.54 |
|
|
| Show |
|
107489 |
21 54 17 +19 43 05 |
COU 432 BC |
2021 |
35 |
299 |
0.1 |
8.80 |
9.00 |
0.20 |
Y |
<=== |
Triple system
4 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Constellation |
Pegasus |
|
SAO |
107489 |
|
HIP |
108121 |
|
Tycho2 |
1687-02027-1 |
|
| Gaia DR2 |
1780303805784806784 |
|
HD |
208202 |
|
HR |
8364 |
|
ADS |
15431 |
|
| BD |
BD+19 4814 |
|
Distance |
37.61 |
|
Distance ly |
122.68 |
|
ORBITAL ELEMENTS
| Period (P) | 69.94y | |
Periastron (T) | 1985.2y | |
Semi-major axis (a) | 0.192a | |
| Eccentricity (e) | 0.063 | |
Inclination (i) | 108.2° | |
Longitude of periastron (ω) | 71.3° | |
| Node (Ω) | 191.2° | |
Notes | n | |
Reference | Tok2017c | |
| Equinox | 2000 | |
Last observation | 2017 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
19.6 |
0.173 |
| 2001 |
17.7 |
0.180 |
| 2002 |
16.0 |
0.186 |
| 2003 |
14.3 |
0.191 |
| 2004 |
12.7 |
0.194 |
| 2005 |
11.2 |
0.195 |
| 2006 |
9.6 |
0.196 |
| 2007 |
8.1 |
0.195 |
| 2008 |
6.5 |
0.192 |
| 2009 |
4.8 |
0.189 |
| 2010 |
3.1 |
0.184 |
| 2011 |
1.3 |
0.178 |
| 2012 |
359.4 |
0.171 |
| 2013 |
357.3 |
0.163 |
| 2014 |
354.9 |
0.154 |
| 2015 |
352.3 |
0.144 |
| 2016 |
349.2 |
0.134 |
| 2017 |
345.6 |
0.123 |
| 2018 |
341.4 |
0.112 |
| 2019 |
336.2 |
0.101 |
| 2020 |
329.7 |
0.091 |
| 2021 |
321.7 |
0.081 |
| 2022 |
311.6 |
0.073 |
| 2023 |
299.3 |
0.067 |
| 2024 |
285.2 |
0.064 |
| 2025 |
270.6 |
0.064 |
| 2026 |
257.2 |
0.069 |
| 2027 |
245.7 |
0.076 |
| 2028 |
236.5 |
0.085 |
| 2029 |
229.1 |
0.095 |
| 2030 |
223.2 |
0.106 |
|
|
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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