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Doubles in session


Current system
20423+5723
BU 152
HD 197618


Nearby doubles
9' : 20416+5730
LDS1476AB

26' : 20412+5659
HJ 1570AB

28' : 20454+5735
ENG 76AB

41' : 20400+5647
OSW 78

58' : 20354+5712
TDT2399

58' : 20381+5637
A 745

59' : 20495+5728
MLB 86

64' : 20383+5629
FOX 38

64' : 20389+5820
TDT2449

67' : 20343+5707
STI2541

68' : 20500+5751
CVR 232

70' : 20404+5615
OSW 73

70' : 20356+5808
A 741AB

72' : 20483+5815
MLR 360

72' : 20424+5611
VKI 47

73' : 20470+5825
HDS2961

75' : 20443+5610
A 1684

77' : 20330+5712
A 739

78' : 20422+5606
OSW 74

83' : 20351+5624
HJ 1551

85' : 20352+5622
HJ 1552

85' : 20398+5844
MLB 85

87' : 20472+5607
KR 52

90' : 20342+5622
HJ 1546

91' : 20312+5714
A 872

92' : 20562+5742
HJ 1595



Selections
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Binocular doubles
Binary Systems
Triple Systems
Quadruple Systems
Multiple Systems
Neglected List I
Neglected List II
Observed
Herschel, W.
Herschel, J.F.W.
Struve, Otto
Struve, F.G.W.

20423+5723 BU 152 (HD 197618)

 
 
20h 42m 16.81s +57° 23' 07.4" P.A. 81.00 sep 1.2 mag 7.21,8.80 Sp A4IV dist. 152.44 pc (497.26 l.y.)
 
 
Coord 2000 20423+5723 Discov num BU  152 Comp Coord arcsec 2000 20 42 16.81 +57 23 07.4
Date first 1873 Date last 2023 Obs 65
Pa first 130 Pa last 81.2 P.A. Now (θ) 82.2°
Sep first 0.4 Sep last 1.21 Sep. Now (ρ) 1.233"
Mag pri 7.21 Mag sec 8.80 delta mag (ΔM) 1.59 Spectral class A4IV (white)
Pri motion ra -006 Sec motion ra -006
Pri motion dec +005 Sec motion dec +005
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 197618 Constellation Cepheus SAO 32812 HIP 102183
Tycho2 3959-01153-1 Gaia DR2 2187250513975684224 HD 197618 GC 28872
ADS 14196 BD BD+56 2474 Distance 152.44 Distance ly 497.26
 
 
ORBITAL ELEMENTS
 
 
Period (P)737.3089y± 353.7497 Periastron (T)1811.6742y± 81.8172 Semi-major axis (a)1.02596a± 0.34006
Eccentricity (e)0.32296± 0.42968 Inclination (i)109.39°± 9.086 Longitude of periastron (ω)234.888°± 90.989
Node (Ω)84.418°± 10.233 Notes ReferenceIzm2019
Equinox Last observation2015 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 84.0 1.136
2001 83.9 1.138
2002 83.8 1.140
2003 83.7 1.142
2004 83.5 1.144
2005 83.4 1.146
2006 83.3 1.148
2007 83.2 1.150
2008 83.0 1.152
2009 82.9 1.154
2010 82.8 1.156
2011 82.7 1.158
2012 82.6 1.159
2013 82.4 1.161
2014 82.3 1.162
2015 82.2 1.164
2016 82.1 1.165
2017 82.0 1.167
2018 81.8 1.168
2019 81.7 1.169
2020 81.6 1.170
2021 81.5 1.172
2022 81.4 1.173
2023 81.3 1.174
2024 81.1 1.175
2025 81.0 1.176
2026 80.9 1.177
2027 80.8 1.178
2028 80.7 1.179
2029 80.6 1.179
2030 80.4 1.180
2031 80.3 1.181
2032 80.2 1.181
2033 80.1 1.182
2034 80.0 1.183
2035 79.9 1.183
2036 79.7 1.183
2037 79.6 1.184
2038 79.5 1.184
2039 79.4 1.185
2040 79.3 1.185
2041 79.2 1.185
2042 79.1 1.185
2043 78.9 1.185
2044 78.8 1.185
2045 78.7 1.185
2046 78.6 1.185
2047 78.5 1.185
2048 78.4 1.185
2049 78.3 1.185
2050 78.1 1.185


 
 grafico orbita
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
wds20423%2B5723a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic