21028+4551 BU 1138 AB
21h 02m 48.62s +45° 50' 56.0" P.A. 172.00 sep 0.1 mag 7.10,7.30 Sp B3Vn dist. 400 pc (1304.8 l.y.)
Coord 2000 |
21028+4551 |
|
Discov num |
BU 1138 |
|
Comp |
AB |
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Coord arcsec 2000 |
21 02 48.62 +45 50 56.0 |
|
Date first |
1888 |
|
Date last |
2006 |
|
Obs |
57 |
|
Pa first |
186 |
|
Pa last |
171.8 |
|
P.A. Now (θ) |
171.8° |
|
Sep first |
0.3 |
|
Sep last |
0.075 |
|
Sep. Now (ρ) |
0.075" |
|
Mag pri |
7.10 |
|
Mag sec |
7.30 |
|
delta mag (ΔM) |
0.2 |
|
Spectral class |
B3Vn (blue-white) |
|
Pri motion ra |
+009 |
|
Sec motion ra |
|
|
Pri motion dec |
+004 |
|
Sec motion dec |
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|
Notes |
N
O
(See Notes, Orbital solution) |
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This double is physical.
21028+4551 SYSTEM COMPONENTS
Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
Show |
|
50390 |
21 02 49 +45 50 56 |
BU 1138 AB |
2006 |
57 |
172 |
0.1 |
7.10 |
7.30 |
0.20 |
Y |
<=== |
Show |
HD 200595 |
50390 |
21 02 49 +45 50 56 |
BU 1138 AC |
2012 |
21 |
330 |
152.1 |
6.46 |
7.82 |
1.36 |
|
|
Show |
|
50388 |
21 02 41 +45 53 05 |
KUI 104 CD |
2017 |
17 |
85 |
2.7 |
7.82 |
13.40 |
5.58 |
|
|
Show |
|
50388 |
21 02 41 +45 53 05 |
BU 1138 CE |
2003 |
8 |
249 |
23.6 |
7.82 |
12.38 |
4.56 |
|
|
Show |
|
50388 |
21 02 41 +45 53 05 |
FYM 331 CF |
2017 |
6 |
39 |
11.9 |
7.82 |
15.70 |
7.88 |
|
|
Show |
|
50388 |
21 02 41 +45 53 05 |
HLA 30 CG |
2016 |
1 |
148 |
7.3 |
5.40 |
14.30 |
8.90 |
|
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Septuple system
7 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
Constellation |
Cygnus |
|
SAO |
50390 |
|
HIP |
103871 |
|
Tycho2 |
3588-12113-1 |
|
Gaia DR2 |
2163558581037174528 |
|
HD |
200595 |
|
HR |
8064 |
|
GC |
29403 |
|
ADS |
14585 |
|
BD |
BD+45 3374 |
|
Distance |
400 |
|
Distance ly |
1304.8 |
|
ORBITAL ELEMENTS
Period (P) | 314.09y | |
Periastron (T) | 2003.29y | |
Semi-major axis (a) | 0.26a | |
Eccentricity (e) | 0.5 | |
Inclination (i) | 96.4° | |
Longitude of periastron (ω) | 302.8° | |
Node (Ω) | 181.7° | |
Notes | n | |
Reference | Hrt2001b | |
Equinox | 2000 | |
Last observation | 1985 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
198.9 |
0.047 |
2001 |
195.9 |
0.054 |
2002 |
193.7 |
0.062 |
2003 |
192.0 |
0.069 |
2004 |
190.5 |
0.077 |
2005 |
189.4 |
0.084 |
2006 |
188.4 |
0.091 |
2007 |
187.5 |
0.097 |
2008 |
186.8 |
0.104 |
2009 |
186.1 |
0.110 |
2010 |
185.6 |
0.115 |
2011 |
185.0 |
0.121 |
2012 |
184.5 |
0.126 |
2013 |
184.1 |
0.131 |
2014 |
183.7 |
0.135 |
2015 |
183.3 |
0.139 |
2016 |
182.9 |
0.143 |
2017 |
182.5 |
0.146 |
2018 |
182.2 |
0.149 |
2019 |
181.8 |
0.152 |
2020 |
181.5 |
0.155 |
2021 |
181.2 |
0.157 |
2022 |
180.9 |
0.159 |
2023 |
180.6 |
0.161 |
2024 |
180.3 |
0.162 |
2025 |
180.1 |
0.163 |
2026 |
179.8 |
0.164 |
2027 |
179.5 |
0.165 |
2028 |
179.2 |
0.165 |
2029 |
179.0 |
0.166 |
2030 |
178.7 |
0.166 |
|
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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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