20511+5125 BU 155 AB (HD 198834)
20h 51m 05.41s +51° 25' 01.7" P.A. 40.00 sep 0.7 mag 7.36,8.13 Sp A9IV dist. 124.53 pc (406.22 l.y.)
| Coord 2000 |
20511+5125 |
|
Discov num |
BU 155 |
|
Comp |
AB |
|
Coord arcsec 2000 |
20 51 05.41 +51 25 01.7 |
|
| Date first |
1873 |
|
Date last |
2018 |
|
Obs |
58 |
|
| Pa first |
40 |
|
Pa last |
40.3 |
|
P.A. Now (θ) |
40.3° |
|
| Sep first |
0.6 |
|
Sep last |
0.7 |
|
Sep. Now (ρ) |
0.7" |
|
| Mag pri |
7.36 |
|
Mag sec |
8.13 |
|
delta mag (ΔM) |
0.77 |
|
Spectral class |
A9IV (white) |
|
| Pri motion ra |
+040 |
|
Sec motion ra |
+040 |
|
| Pri motion dec |
+041 |
|
Sec motion dec |
+041 |
|
| Notes |
O
(Orbital solution) |
|
This double is physical.
20511+5125 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
HD 198834 |
32933 |
20 51 05 +51 25 02 |
BU 155 AB |
2018 |
58 |
40 |
0.7 |
7.36 |
8.13 |
0.77 |
Y |
<=== |
| Show |
|
32933 |
20 51 05 +51 25 02 |
BU 155 AC |
2015 |
8 |
40 |
14.8 |
7.36 |
12.60 |
5.24 |
|
|
| Show |
|
32933 |
20 51 05 +51 25 02 |
BU 155 AD |
2015 |
8 |
48 |
191.8 |
7.36 |
11.50 |
4.14 |
|
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Quadruple system
4 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 198834 |
|
Constellation |
Cygnus |
|
SAO |
32933 |
|
HIP |
102921 |
|
| Tycho2 |
3587-01042-1 |
|
Gaia DR2 |
2169957120223515776 |
|
HD |
198834 |
|
GC |
29096 |
|
| ADS |
14370 |
|
BD |
BD+50 3215 |
|
Distance |
124.53 |
|
Distance ly |
406.22 |
|
ORBITAL ELEMENTS
| Period (P) | 764.5978y | ± 417.622 |
Periastron (T) | 2041.9175y | ± 210.4531 |
Semi-major axis (a) | 0.99427a | ± 0.39382 |
| Eccentricity (e) | 0.19114 | ± 0.41488 |
Inclination (i) | 82.082° | ± 3.056 |
Longitude of periastron (ω) | 47.68° | ± 58.96 |
| Node (Ω) | 34.391° | ± 4.976 |
Notes | | |
Reference | Izm2019 | |
| Equinox | | |
Last observation | 2014 | |
Grade | 5 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
37.0 |
0.779 |
| 2001 |
37.1 |
0.776 |
| 2002 |
37.2 |
0.772 |
| 2003 |
37.3 |
0.768 |
| 2004 |
37.4 |
0.764 |
| 2005 |
37.6 |
0.760 |
| 2006 |
37.7 |
0.755 |
| 2007 |
37.8 |
0.751 |
| 2008 |
37.9 |
0.747 |
| 2009 |
38.0 |
0.742 |
| 2010 |
38.1 |
0.737 |
| 2011 |
38.2 |
0.733 |
| 2012 |
38.4 |
0.728 |
| 2013 |
38.5 |
0.723 |
| 2014 |
38.6 |
0.718 |
| 2015 |
38.7 |
0.713 |
| 2016 |
38.8 |
0.708 |
| 2017 |
39.0 |
0.703 |
| 2018 |
39.1 |
0.697 |
| 2019 |
39.2 |
0.692 |
| 2020 |
39.4 |
0.687 |
| 2021 |
39.5 |
0.681 |
| 2022 |
39.6 |
0.675 |
| 2023 |
39.8 |
0.670 |
| 2024 |
39.9 |
0.664 |
| 2025 |
40.1 |
0.658 |
| 2026 |
40.2 |
0.652 |
| 2027 |
40.4 |
0.646 |
| 2028 |
40.5 |
0.640 |
| 2029 |
40.7 |
0.634 |
| 2030 |
40.8 |
0.628 |
|
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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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