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Doubles in session


Current system
20057-3743
HDS2865


Nearby doubles
48' : 20064-3829
RST2132

51' : 20098-3732
B 2883

55' : 20020-3816
TDT1925

57' : 20013-3722
SKF2084

65' : 20003-3742
HDO 293

66' : 20002-3736
TDT1908

72' : 20069-3633
JSP 809

72' : 20035-3636
B 463AB

73' : 20090-3843
SEE 407

74' : 20114-3715
B 470

75' : 20012-3835
HDO 294

77' : 20118-3825
TOK 904

78' : 19596-3813
RST2126

81' : 20006-3836
KPP 450

87' : 20108-3845
YMG 90

90' : 20123-3826
SKF2085

100' : 20134-3821
B 472

104' : 20047-3600
I 9021

106' : 20053-3557
KPP 454

111' : 20131-3637
TDT2097

111' : 20081-3929
RST2134

112' : 19578-3644
JSP 808

113' : 20098-3602
HDS2872

116' : 20041-3548
NSN 484

118' : 20112-3606
HJ 5173AB

119' : 19562-3820
SEE 398



Selections
Full WDS
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.

20057-3743 HDS2865

 
 
20h 05m 41.20s -37° 42' 53.2" P.A. 194.10 sep 0.1 mag 8.53,9.11 Sp F3V dist. 149.03 pc (486.14 l.y.)
 
 
Coord 2000
20057-3743
 Discov num
HDS2865
 Comp
Coord arcsec 2000
20 05 41.20 -37 42 53.2
Date first
1991
 Date last
2019
 Obs
8
Pa first
51
 Pa last
206
 P.A. Now (θ)
194.1°
Sep first
0.2
 Sep last
0.1
 Sep. Now (ρ)
0.12"
Mag pri
8.53
 Mag sec
9.11
 delta mag (ΔM)
0.58
 Spectral class
F3V (yellow-white)
Pri motion ra
+017
 Sec motion ra
Pri motion dec
-007
 Sec motion dec
Notes
O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
205.6
 Precise sep
0.109
 Constellation
Sagittarius
 SAO
211799
HIP
98979
 Tycho2
7947-03226-1
 Gaia DR2
6696917383945134080
 HD
190289
CD
CD-3813850
 CP
CP-38 7940
 Distance
149.03
 Distance ly
486.14
last precise pa
205.6
 last precise sep
0.109
 
 
ORBITAL ELEMENTS
 
 
Period (P)50y Periastron (T)2018.71y± 0.56 Semi-major axis (a)0.1778a± 0.0043
Eccentricity (e)0.328± 0.04 Inclination (i)131.5°± 4.2 Longitude of periastron (ω)131.7°± 6.6
Node (Ω)4.2°± 3.7 Note Grade4(1=Definitive, 9=Indet.)
Equinox2000 Last observation
label rho theta
2000 0.216 20.1
2001 0.216 17.1
2002 0.214 14.0
2003 0.212 10.9
2004 0.208 7.6
2005 0.203 4.3
2006 0.197 0.7
2007 0.189 356.9
2008 0.179 352.6
2009 0.168 347.9
2010 0.156 342.5
2011 0.142 336.1
2012 0.128 328.3
2013 0.113 318.4
2014 0.100 305.8
2015 0.089 289.7
2016 0.084 270.5
2017 0.085 250.3
2018 0.092 232.0
2019 0.102 216.8
2020 0.113 204.4
2021 0.122 194.1
2022 0.130 185.2
2023 0.134 177.0
2024 0.137 169.3
2025 0.138 161.8
2026 0.138 154.3
2027 0.137 146.7
2028 0.135 139.0
2029 0.134 131.1
2030 0.133 123.2


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


 
  


wds20057-3743a.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
20057-3743 HDS2865 1991 1 51 0.2 8.53 9.11 F3V 200541.20-374253.2
20057-3743 HDS2865 2008 2 170 0.2 8.53 9.11 F3V 200541.20-374253.2
20057-3743 HDS2865 2014 3 293 0.1 8.53 9.11 F3V 200541.20-374253.2
20057-3743 HDS2865 2015 5 276 0.1 8.53 9.11 F3V 200541.20-374253.2
20057-3743 HDS2865 2017 6 239 0.1 8.53 9.11 F3V O 200541.20-374253.2
20057-3743 HDS2865 2018 7 224 0.1 8.53 9.11 F3V O 200541.20-374253.2
20057-3743 HDS2865 2019 8 206 0.1 8.53 9.11 F3V O 200541.20-374253.2

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