21556+3849 A 1449 (HD 208490)
21h 55m 33.91s +38° 48' 59.8" P.A. 50.00 sep 0.3 mag 9.60,9.60 Sp G0 dist. 222.22 pc (724.88 l.y.)
| Coord 2000 |
21556+3849 |
|
Discov num |
A 1449 |
|
Comp |
|
|
Coord arcsec 2000 |
21 55 33.91 +38 48 59.8 |
|
| Date first |
1906 |
|
Date last |
2011 |
|
Obs |
32 |
|
| Pa first |
24 |
|
Pa last |
50 |
|
P.A. Now (θ) |
225° |
|
| Sep first |
0.4 |
|
Sep last |
0.271 |
|
Sep. Now (ρ) |
0.343" |
|
| Mag pri |
9.60 |
|
Mag sec |
9.60 |
|
delta mag (ΔM) |
0 |
|
Spectral class |
G0 (yellow) |
|
| Pri motion ra |
+046 |
|
Sec motion ra |
|
|
| Pri motion dec |
-025 |
|
Sec motion dec |
|
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 208490 |
|
Constellation |
Cygnus |
|
SAO |
71845 |
|
HIP |
108231 |
|
| Tycho2 |
3185-01617-1 |
|
HD |
208490 |
|
ADS |
15454 |
|
BD |
BD+38 4638 |
|
| Distance |
222.22 |
|
Distance ly |
724.88 |
|
ORBITAL ELEMENTS
| Period (P) | 161.57y | |
Periastron (T) | 1978.15y | |
Semi-major axis (a) | 0.241a | |
| Eccentricity (e) | 0.709 | |
Inclination (i) | 152.8° | |
Longitude of periastron (ω) | 351.1° | |
| Node (Ω) | 17.5° | |
Notes | n | |
Reference | Hrt2014b | |
| Equinox | 2000 | |
Last observation | 2008 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
248.5 |
0.222 |
| 2001 |
246.9 |
0.229 |
| 2002 |
245.4 |
0.235 |
| 2003 |
244.0 |
0.242 |
| 2004 |
242.6 |
0.248 |
| 2005 |
241.3 |
0.255 |
| 2006 |
240.1 |
0.261 |
| 2007 |
238.9 |
0.267 |
| 2008 |
237.8 |
0.272 |
| 2009 |
236.8 |
0.278 |
| 2010 |
235.7 |
0.283 |
| 2011 |
234.7 |
0.289 |
| 2012 |
233.8 |
0.294 |
| 2013 |
232.9 |
0.299 |
| 2014 |
232.0 |
0.304 |
| 2015 |
231.1 |
0.309 |
| 2016 |
230.3 |
0.314 |
| 2017 |
229.4 |
0.318 |
| 2018 |
228.7 |
0.323 |
| 2019 |
227.9 |
0.327 |
| 2020 |
227.1 |
0.331 |
| 2021 |
226.4 |
0.335 |
| 2022 |
225.7 |
0.339 |
| 2023 |
225.0 |
0.343 |
| 2024 |
224.3 |
0.347 |
| 2025 |
223.6 |
0.350 |
| 2026 |
223.0 |
0.354 |
| 2027 |
222.3 |
0.357 |
| 2028 |
221.7 |
0.360 |
| 2029 |
221.1 |
0.364 |
| 2030 |
220.5 |
0.367 |
|
|
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
|
|
|
|
|
|
|
|
Measures: green=micrometric, blue=interferometric, purple=photographic |
|
