21115+2144 COU 227
21h 11m 28.93s +21° 44' 01.0" P.A. 122.00 sep 0.5 mag 10.05,11.77 Sp K2 dist. 76.57 pc (249.77 l.y.)
| Coord 2000 |
21115+2144 |
|
Discov num |
COU 227 |
|
Comp |
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Coord arcsec 2000 |
21 11 28.93 +21 44 01.0 |
|
| Date first |
1967 |
|
Date last |
2014 |
|
Obs |
23 |
|
| Pa first |
26 |
|
Pa last |
121.7 |
|
P.A. Now (θ) |
121.7° |
|
| Sep first |
0.5 |
|
Sep last |
0.498 |
|
Sep. Now (ρ) |
0.498" |
|
| Mag pri |
10.05 |
|
Mag sec |
11.77 |
|
delta mag (ΔM) |
1.72 |
|
Spectral class |
K2 (yellow-orange) |
|
| Pri motion ra |
-082 |
|
Sec motion ra |
|
|
| Pri motion dec |
-053 |
|
Sec motion dec |
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| Notes |
O
(Orbital solution) |
|
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Constellation |
Vulpecula |
|
HIP |
104612 |
|
Tycho2 |
1661-01647-1 |
|
Gaia DR2 |
1790160790089380736 |
|
| BD |
BD+21 4489 |
|
Distance |
76.57 |
|
Distance ly |
249.77 |
|
ORBITAL ELEMENTS
| Period (P) | 198.66y | |
Periastron (T) | 2031.7y | |
Semi-major axis (a) | 0.669a | |
| Eccentricity (e) | 0.299 | |
Inclination (i) | 52.9° | |
Longitude of periastron (ω) | 44.5° | |
| Node (Ω) | 126.3° | |
Notes | | |
Reference | FMR2012b | |
| Equinox | 2000 | |
Last observation | 2010 | |
Grade | 5 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
93.5 |
0.499 |
| 2001 |
95.4 |
0.502 |
| 2002 |
97.2 |
0.505 |
| 2003 |
99.1 |
0.508 |
| 2004 |
100.9 |
0.510 |
| 2005 |
102.6 |
0.513 |
| 2006 |
104.4 |
0.515 |
| 2007 |
106.2 |
0.517 |
| 2008 |
107.9 |
0.518 |
| 2009 |
109.6 |
0.519 |
| 2010 |
111.4 |
0.519 |
| 2011 |
113.1 |
0.519 |
| 2012 |
114.8 |
0.519 |
| 2013 |
116.6 |
0.518 |
| 2014 |
118.3 |
0.516 |
| 2015 |
120.1 |
0.514 |
| 2016 |
121.9 |
0.512 |
| 2017 |
123.6 |
0.508 |
| 2018 |
125.5 |
0.504 |
| 2019 |
127.3 |
0.499 |
| 2020 |
129.2 |
0.494 |
| 2021 |
131.2 |
0.488 |
| 2022 |
133.1 |
0.481 |
| 2023 |
135.2 |
0.474 |
| 2024 |
137.3 |
0.466 |
| 2025 |
139.5 |
0.458 |
| 2026 |
141.8 |
0.448 |
| 2027 |
144.1 |
0.439 |
| 2028 |
146.6 |
0.429 |
| 2029 |
149.2 |
0.418 |
| 2030 |
152.0 |
0.408 |
|
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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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