20210+4437 A 725
20h 20m 57.88s +44° 36' 29.7" P.A. 25.00 sep 0.9 mag 9.46,10.23 Sp K0 dist. 47.57 pc (155.17 l.y.)
| Coord 2000 |
20210+4437 |
|
Discov num |
A 725 |
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Comp |
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Coord arcsec 2000 |
20 20 57.88 +44 36 29.7 |
|
| Date first |
1904 |
|
Date last |
2017 |
|
Obs |
41 |
|
| Pa first |
50 |
|
Pa last |
25.1 |
|
P.A. Now (θ) |
25.1° |
|
| Sep first |
1.0 |
|
Sep last |
0.878 |
|
Sep. Now (ρ) |
0.878" |
|
| Mag pri |
9.46 |
|
Mag sec |
10.23 |
|
delta mag (ΔM) |
0.77 |
|
Spectral class |
K0 (yellow-orange) |
|
| Pri motion ra |
-145 |
|
Sec motion ra |
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| Pri motion dec |
+049 |
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Sec motion dec |
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| Notes |
N
O
(See Notes, Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Constellation |
Cygnus |
|
HIP |
100341 |
|
Tycho2 |
3164-00048-1 |
|
Gaia DR2 |
2081388160068434048 |
|
| ADS |
13744 |
|
BD |
BD+44 3436 |
|
Distance |
47.57 |
|
Distance ly |
155.17 |
|
ORBITAL ELEMENTS
| Period (P) | 166.85y | ± 7.08 |
Periastron (T) | 1959.85y | ± 0.97 |
Semi-major axis (a) | 0.715a | ± 0.021 |
| Eccentricity (e) | 0.494 | ± 0.021 |
Inclination (i) | 65.7° | ± 1.7 |
Longitude of periastron (ω) | 341.4° | ± 2.5 |
| Node (Ω) | 226.4° | ± 0.9 |
Notes | n | |
Reference | Hrt2009 | |
| Equinox | | |
Last observation | 2006 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
9.9 |
0.515 |
| 2001 |
11.3 |
0.532 |
| 2002 |
12.7 |
0.550 |
| 2003 |
13.9 |
0.567 |
| 2004 |
15.1 |
0.585 |
| 2005 |
16.3 |
0.602 |
| 2006 |
17.3 |
0.618 |
| 2007 |
18.3 |
0.635 |
| 2008 |
19.3 |
0.651 |
| 2009 |
20.2 |
0.667 |
| 2010 |
21.0 |
0.683 |
| 2011 |
21.9 |
0.699 |
| 2012 |
22.7 |
0.714 |
| 2013 |
23.4 |
0.729 |
| 2014 |
24.2 |
0.744 |
| 2015 |
24.9 |
0.758 |
| 2016 |
25.5 |
0.772 |
| 2017 |
26.2 |
0.786 |
| 2018 |
26.8 |
0.799 |
| 2019 |
27.4 |
0.812 |
| 2020 |
28.0 |
0.825 |
| 2021 |
28.6 |
0.838 |
| 2022 |
29.1 |
0.850 |
| 2023 |
29.7 |
0.861 |
| 2024 |
30.2 |
0.873 |
| 2025 |
30.7 |
0.884 |
| 2026 |
31.2 |
0.895 |
| 2027 |
31.7 |
0.905 |
| 2028 |
32.2 |
0.915 |
| 2029 |
32.6 |
0.925 |
| 2030 |
33.1 |
0.934 |
|
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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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