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Doubles in session


Current system
20210+4437
A 725


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TDT2198



Selections
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Binary Systems
Triple Systems
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Neglected List I
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Observed
Herschel, W.
Herschel, J.F.W.
Struve, Otto
Struve, F.G.W.

20210+4437 A   725

 
 
20h 20m 57.88s +44° 36' 29.7" P.A. 28.60 sep 0.8 mag 9.46,10.23 Sp K0 dist. 47.57 pc (155.17 l.y.)
 
 
Coord 2000
20210+4437
 Discov num
A   725
 Comp
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
 P.A. Now (θ)
28.6°
Sep first
1.0
 Sep last
0.9
 Sep. Now (ρ)
0.84"
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
Pri motion dec
+049
 Sec motion dec
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
25.1
 Precise sep
0.878
 Constellation
Cygnus
 SAO
49503
HIP
100341
 Tycho2
3164-00048-1
 Gaia DR2
2081388160068434048
 ADS
13744
BD
BD+44 3436
 Distance
47.57
 Distance ly
155.17
 last precise pa
25.1
last precise sep
0.878
 
 
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 Note Grade4(1=Definitive, 9=Indet.)
Equinox Last observation2006
label rho theta
2000 0.515 9.9
2001 0.532 11.3
2002 0.550 12.7
2003 0.567 13.9
2004 0.585 15.1
2005 0.602 16.3
2006 0.618 17.3
2007 0.635 18.3
2008 0.651 19.3
2009 0.667 20.2
2010 0.683 21.0
2011 0.699 21.9
2012 0.714 22.7
2013 0.729 23.4
2014 0.744 24.2
2015 0.758 24.9
2016 0.772 25.5
2017 0.786 26.2
2018 0.799 26.8
2019 0.812 27.4
2020 0.825 28.0
2021 0.838 28.6
2022 0.850 29.1
2023 0.861 29.7
2024 0.873 30.2
2025 0.884 30.7
2026 0.895 31.2
2027 0.905 31.7
2028 0.915 32.2
2029 0.925 32.6
2030 0.934 33.1


 
 grafico orbita
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.


 
  


wds20210%2B4437a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic		  
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
20210+4437 A 725 2000 33 10 0.5 9.46 10.23 K0 NOD 202057.88+443629.7
20210+4437 A 725 2006 34 18 0.7 9.46 10.23 K0 NOD 202057.88+443629.7
20210+4437 A 725 2010 36 21 0.7 9.46 10.23 K0 NOD 202057.88+443629.7
20210+4437 A 725 2016 38 26 0.8 9.46 10.23 K0 NO 202057.88+443629.7
20210+4437 A 725 2017 39 25 0.9 9.46 10.23 K0 NO 202057.88+443629.7

If you need more information about this double, apply for a data request form to the WDS.