20205+4351 IOT 2 Aa,Ab (V1687 Cyg)
20h 20m 27.98s +43° 51' 16.3" P.A. 152.00 sep 0.0 mag 6.10,6.30 Sp WR+O dist. 4000 pc (13048 l.y.)
Coord 2000 |
20205+4351 |
|
Discov num |
IOT 2 |
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Comp |
Aa,Ab |
|
Coord arcsec 2000 |
20 20 27.98 +43 51 16.3 |
|
Date first |
2003 |
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Date last |
2019 |
|
Obs |
11 |
|
Pa first |
152 |
|
Pa last |
152.4 |
|
P.A. Now (θ) |
313.2° |
|
Sep first |
0.0 |
|
Sep last |
0.013 |
|
Sep. Now (ρ) |
0.009" |
|
Mag pri |
6.10 |
|
Mag sec |
6.30 |
|
delta mag (ΔM) |
0.2 |
|
Spectral class |
WR+O (Wolf-Rayet/blue) |
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Pri motion ra |
-003 |
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Sec motion ra |
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Pri motion dec |
-008 |
|
Sec motion dec |
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Notes |
N
O
K
(See Notes, Orbital solution, K-band or other infrared magnitudes) |
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Visually invisible, K-band or other infrared star : Summary line gives K-band or other infrared (>1 micron) magnitudes
This double is physical.
20205+4351 SYSTEM COMPONENTS
Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
Show |
V1687 Cyg |
49491 |
20 20 28 +43 51 16 |
IOT 2 Aa,Ab |
2019 |
11 |
152 |
0.0 |
6.10 |
6.30 |
0.20 |
Y |
<=== |
Show |
|
49491 |
20 20 28 +43 51 16 |
BU 1207 AB |
2015 |
10 |
211 |
4.8 |
6.85 |
14.40 |
7.55 |
|
|
Show |
|
49491 |
20 20 28 +43 51 16 |
TRN 29 AC |
2001 |
1 |
202 |
2.3 |
6.85 |
16.00 |
9.15 |
|
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Quadruple system
3 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
Var name |
V1687 Cyg |
|
Constellation |
Cygnus |
|
SAO |
49491 |
|
HIP |
100287 |
|
Tycho2 |
3164-01678-1 |
|
Gaia DR2 |
2081261372633822592 |
|
HD |
193793 |
|
ADS |
13736 |
|
BD |
BD+43 3571 |
|
Distance |
4000 |
|
Distance ly |
13048 |
|
ORBITAL ELEMENTS
Period (P) | 2895d (7.93y) | ± 0.29 |
Periastron (T) | 60636.23d (2024.892y) | ± 0.53 |
Semi-major axis (a) | 8.922m | ± 0.067 |
Eccentricity (e) | 0.8993 | ± 0.0013 |
Inclination (i) | 119.07° | ± 0.88 |
Longitude of periastron (ω) | 227.44° | ± 0.52 |
Node (Ω) | 353.87° | ± 0.67 |
Notes | n | |
Reference | CIA2021a | |
Equinox | | |
Last observation | 2019 | |
Grade | 2 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000-01-01 |
302.3 |
0.006 |
2001-01-01 |
212.1 |
0.002 |
2002-01-01 |
342.6 |
0.009 |
2003-01-01 |
335.5 |
0.012 |
2004-01-01 |
330.7 |
0.013 |
2005-01-01 |
326.3 |
0.013 |
2006-01-01 |
321.4 |
0.012 |
2007-01-01 |
314.5 |
0.009 |
2008-01-01 |
300.7 |
0.006 |
2009-01-01 |
181.4 |
0.001 |
2010-01-01 |
341.9 |
0.009 |
2011-01-01 |
335.1 |
0.012 |
2012-01-01 |
330.4 |
0.013 |
2013-01-01 |
326.0 |
0.013 |
2014-01-01 |
321.0 |
0.012 |
2015-01-01 |
313.9 |
0.009 |
2016-01-01 |
298.9 |
0.005 |
2017-01-01 |
56.5 |
0.001 |
2018-01-01 |
341.2 |
0.009 |
2019-01-01 |
334.8 |
0.012 |
2020-01-01 |
330.1 |
0.013 |
2021-01-01 |
325.7 |
0.013 |
2022-01-01 |
320.5 |
0.011 |
2023-01-01 |
313.2 |
0.009 |
2024-01-01 |
296.8 |
0.005 |
2025-01-01 |
8.7 |
0.002 |
2026-01-01 |
340.6 |
0.010 |
2027-01-01 |
334.4 |
0.012 |
2028-01-01 |
329.8 |
0.013 |
2029-01-01 |
325.3 |
0.013 |
2030-01-01 |
320.1 |
0.011 |
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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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