18421+3445 B 2546 Aa,Ab
18h 42m 08.09s +34° 44' 46.7" P.A. 24.00 sep 0.1 mag 6.50,7.50 Sp B5V dist. 456.62 pc (1489.49 l.y.)
Coord 2000 |
18421+3445 |
|
Discov num |
B 2546 |
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Comp |
Aa,Ab |
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Coord arcsec 2000 |
18 42 08.09 +34 44 46.7 |
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Date first |
1958 |
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Date last |
2016 |
|
Obs |
45 |
|
Pa first |
254 |
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Pa last |
24.4 |
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P.A. Now (θ) |
24.4° |
|
Sep first |
0.2 |
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Sep last |
0.124 |
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Sep. Now (ρ) |
0.124" |
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Mag pri |
6.50 |
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Mag sec |
7.50 |
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delta mag (ΔM) |
1 |
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Spectral class |
B5V (blue-white) |
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Pri motion ra |
-003 |
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Sec motion ra |
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Pri motion dec |
-001 |
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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.
18421+3445 SYSTEM COMPONENTS
Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
Show |
|
67265 |
18 42 08 +34 44 47 |
B 2546 Aa,Ab |
2016 |
45 |
24 |
0.1 |
6.50 |
7.50 |
1.00 |
Y |
<=== |
Show |
HD 173087 |
67265 |
18 42 08 +34 44 47 |
STF 2372 AB |
2019 |
79 |
82 |
25.0 |
6.45 |
7.73 |
1.28 |
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Show |
|
67265 |
18 42 08 +34 44 47 |
BLL 34 AC |
2013 |
9 |
69 |
114.0 |
6.45 |
11.79 |
5.34 |
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Show |
|
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18 42 10 +34 44 50 |
BLL 34 BC |
2015 |
16 |
65 |
91.1 |
7.73 |
11.79 |
4.06 |
|
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Quadruple system
3 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
Constellation |
Lyra |
|
SAO |
67265 |
|
HIP |
91707 |
|
Tycho2 |
2645-02013-1 |
|
Gaia DR2 |
2091774627937648256 |
|
HD |
173087 |
|
HR |
7033 |
|
ADS |
11593 |
|
BD |
BD+34 3285 |
|
Distance |
456.62 |
|
Distance ly |
1489.49 |
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ORBITAL ELEMENTS
Period (P) | 111.5y | |
Periastron (T) | 2030.1y | |
Semi-major axis (a) | 0.133a | |
Eccentricity (e) | 0.383 | |
Inclination (i) | 36.4° | |
Longitude of periastron (ω) | 58° | |
Node (Ω) | 49.8° | |
Notes | n | |
Reference | USN2002 | |
Equinox | 2000 | |
Last observation | 1996 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
335.4 |
0.127 |
2001 |
338.1 |
0.126 |
2002 |
340.8 |
0.125 |
2003 |
343.5 |
0.124 |
2004 |
346.4 |
0.122 |
2005 |
349.2 |
0.121 |
2006 |
352.1 |
0.120 |
2007 |
355.1 |
0.119 |
2008 |
358.2 |
0.118 |
2009 |
1.3 |
0.116 |
2010 |
4.4 |
0.115 |
2011 |
7.7 |
0.114 |
2012 |
11.0 |
0.113 |
2013 |
14.3 |
0.111 |
2014 |
17.8 |
0.110 |
2015 |
21.4 |
0.108 |
2016 |
25.0 |
0.107 |
2017 |
28.8 |
0.105 |
2018 |
32.7 |
0.103 |
2019 |
36.8 |
0.101 |
2020 |
41.0 |
0.099 |
2021 |
45.4 |
0.097 |
2022 |
50.1 |
0.094 |
2023 |
55.0 |
0.091 |
2024 |
60.3 |
0.089 |
2025 |
65.9 |
0.086 |
2026 |
71.9 |
0.082 |
2027 |
78.4 |
0.079 |
2028 |
85.4 |
0.076 |
2029 |
93.0 |
0.073 |
2030 |
101.1 |
0.071 |
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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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