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Doubles in session


Current system
20536-7750
HDS 2977 AB
HD 197767


Nearby doubles
4' : 20541-7747
TDT2617

24' : 20567-7811
UC 4339

28' : 20593-7811
UC 4350AB

31' : 20533-7720
LDS 723

31' : 20442-7759
HDS2951

31' : 20442-7800
UC 4275

52' : 20375-7800
TDT2432

59' : 21082-7716
TDT2777

69' : 20482-7857
UC 4294

72' : 21051-7649
UC 4374

74' : 20425-7856
UC 4264

77' : 20381-7654
HJ 5199

79' : 21008-7906
KPP 705

83' : 20361-7651
KPP1878

119' : 20373-7938
SPM 39

123' : 21084-7559
I 257

133' : 20551-7538
WIS 344

137' : 20352-7550
LDS 713

148' : 21014-7525
HJ 5230

151' : 20475-8019
HDS2963

151' : 20365-7532
TDT2415

152' : 20522-7519
HJ 5214

155' : 20417-7521
DUN 232

155' : 21092-7525
TDT2788

171' : 20563-7500
UC 4337

176' : 21067-8042
GLI 263



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

20536-7750 HDS 2977 AB (HD 197767)

 
 
20h 53m 34.76s -77° 50' 18.6" P.A. 296.00 sep 0.1 mag 10.19,10.31 Sp G8V dist. 97.28 pc (317.33 l.y.)
 
 
Coord 2000 20536-7750 Discov num HDS2977 Comp AB Coord arcsec 2000 20 53 34.76 -77 50 18.6
Date first 1991 Date last 2021 Obs 9
Pa first 266 Pa last 296.1 P.A. Now (θ) 288.8°
Sep first 0.3 Sep last 0.123 Sep. Now (ρ) 0.199"
Mag pri 10.19 Mag sec 10.31 delta mag (ΔM) 0.12 Spectral class G8V (yellow)
Pri motion ra +050 Sec motion ra
Pri motion dec -057 Sec motion dec
Notes O W (Orbital solution, )
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 197767 Constellation Octans SAO 257860 HIP 103118
Tycho2 9465-01119-1 HD 197767 CP CP-78 1348 Distance 97.28
Distance ly 317.33
 
 
ORBITAL ELEMENTS
 
 
Period (P)67.8y± 14.7 Periastron (T)2018.44y± 0.09 Semi-major axis (a)0.227a± 0.024
Eccentricity (e)0.825± 0.024 Inclination (i)111.7°± 2.8 Longitude of periastron (ω)225.6°± 2.4
Node (Ω)291.1°± 1.5 Notes ReferenceTok2021f
Equinox2000 Last observation2021 Grade3(1=Definitive, 9=Indet.)
label theta rho
2000 257.3 0.206
2001 255.9 0.196
2002 254.4 0.186
2003 252.6 0.176
2004 250.6 0.165
2005 248.4 0.154
2006 245.8 0.143
2007 242.7 0.131
2008 239.1 0.119
2009 234.6 0.108
2010 229.1 0.096
2011 222.1 0.085
2012 213.0 0.074
2013 201.2 0.065
2014 186.1 0.059
2015 168.4 0.055
2016 149.5 0.055
2017 130.8 0.055
2018 109.0 0.044
2019 9.2 0.018
2020 309.1 0.060
2021 299.6 0.099
2022 295.2 0.130
2023 292.5 0.157
2024 290.4 0.179
2025 288.8 0.199
2026 287.5 0.216
2027 286.3 0.231
2028 285.3 0.244
2029 284.4 0.256
2030 283.6 0.267
2031 282.8 0.276
2032 282.1 0.285
2033 281.4 0.292
2034 280.7 0.299
2035 280.1 0.304
2036 279.5 0.309
2037 278.9 0.314
2038 278.3 0.317
2039 277.8 0.320
2040 277.2 0.322
2041 276.7 0.324
2042 276.1 0.325
2043 275.6 0.326
2044 275.1 0.326
2045 274.5 0.326
2046 274.0 0.325
2047 273.4 0.324
2048 272.9 0.322
2049 272.3 0.320
2050 271.8 0.317


 
 grafico orbita
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
wds20536-7750a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic