Double Star Calculator - Orbit

Orbital Elements for HDS2947

WDS:	HDS2947	WDS ID/Discoverer
P:	17.688	Orbital period (years)
a:	0.139	Semi-major axis (arcseconds)
i:	104.3	Inclination (degrees)
Ω:	101.6	Longitude of ascending node (degrees)
T:	2014.815	Epoch of periastron passage (year)
e:	0.749	Eccentricity
ω:	158.3	Longitude of periastron (degrees)
Start-Year:	2016.156	Year
End-Year:	2033.844	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for HDS2947
Position:	204035.25+153835.3	Epoch-2000 right ascension and declination
WDS-ID:	20406+1539	WDS designation
Discoverer Code:	HDS2947	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	197039	HD catalog number
Hipparcos number:	102029	Hipparcos catalog number
V1:	7.27	Magnitude of the primary
V2:	8.14	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2019	Date of last observation
Orbit grade:	2	Orbit grade, ranging from : 1 = Definitive 2 = Good 3 = Reliable 4 = Preliminary 5 = Indeterminate
Flags:		Flags
Ephemerides:		Ephemerides
Code:	Tok2020g	Reference

Double Star Orbit for HDS2947

WDS 6th Orbit including measures of HDS2947

-- Image from the USNO WDS 6th Orbit Catalog (see Acknowledgements) --

Legend:

Green plus signs:	Visual (micrometric) measures
Violet asterisks:	Photographic measures
Blue symbols:	Various interferometric techniques
Dot-dash line:	Indicates the line of nodes

Ephemeris of HDS2947

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.223   103.72
--------------------------
2016.16    0.028   160.55
2016.26    0.032   153.26
2016.36    0.036   147.58
2016.46    0.040   143.10
2016.56    0.045   139.50
2016.66    0.049   136.54
2016.76    0.053   134.08
2016.86    0.058   132.00
2016.96    0.062   130.21
2017.06    0.067   128.66
2017.16    0.071   127.30
2017.26    0.075   126.09
2017.36    0.079   125.01
2017.46    0.084   124.05
2017.56    0.088   123.17
2017.66    0.092   122.37
2017.76    0.096   121.64
2017.86    0.100   120.96
2017.96    0.103   120.34
2018.06    0.107   119.76
2018.16    0.111   119.22
2018.26    0.115   118.71
2018.36    0.118   118.24
2018.46    0.122   117.79
2018.56    0.125   117.37
2018.66    0.129   116.97
2018.76    0.132   116.59
2018.86    0.135   116.23
2018.96    0.138   115.89
2019.06    0.142   115.56
2019.16    0.145   115.24
2019.26    0.148   114.94
2019.36    0.151   114.65
2019.46    0.154   114.38
2019.56    0.156   114.11
2019.66    0.159   113.85
2019.76    0.162   113.60
2019.86    0.165   113.36
2019.96    0.167   113.13
2020.06    0.170   112.90
2020.16    0.172   112.68
2020.26    0.175   112.47
2020.36    0.177   112.26
2020.46    0.180   112.06
2020.56    0.182   111.86
2020.66    0.184   111.67
2020.76    0.186   111.48
2020.86    0.188   111.30
2020.96    0.191   111.12
2021.06    0.193   110.94
2021.16    0.195   110.77
2021.26    0.196   110.60
2021.36    0.198   110.44
2021.46    0.200   110.27
2021.56    0.202   110.12
2021.66    0.204   109.96
2021.76    0.205   109.80
2021.86    0.207   109.65
2021.96    0.208   109.50
2022.06    0.210   109.36
2022.16    0.211   109.21
2022.26    0.213   109.07
2022.36    0.214   108.93
2022.46    0.215   108.79
2022.56    0.217   108.65
2022.66    0.218   108.51
2022.76    0.219   108.38
2022.86    0.220   108.25
2022.96    0.221   108.11
2023.06    0.222   107.98
2023.16    0.223   107.85
2023.26    0.224   107.72
2023.36    0.225   107.60
2023.46    0.226   107.47
2023.56    0.226   107.34
2023.66    0.227   107.22
2023.76    0.228   107.09
2023.86    0.228   106.97
2023.96    0.229   106.85
2024.06    0.229   106.72
2024.16    0.230   106.60
2024.26    0.230   106.48
2024.36    0.230   106.36
2024.46    0.230   106.24
2024.56    0.231   106.11
2024.66    0.231   105.99
2024.76    0.231   105.87
2024.86    0.231   105.75
2024.96    0.231   105.63
2025.06    0.231   105.51
2025.16    0.231   105.39
2025.26    0.230   105.27
2025.36    0.230   105.15
2025.46    0.230   105.03
2025.56    0.230   104.90
2025.66    0.229   104.78
2025.76    0.229   104.66
2025.86    0.228   104.53
2025.96    0.227   104.41
2026.06    0.227   104.29
2026.16    0.226   104.16
2026.26    0.225   104.03
2026.36    0.224   103.91
2026.46    0.224   103.78
2026.56    0.223   103.65
2026.66    0.221   103.52
2026.76    0.220   103.39
2026.86    0.219   103.25
2026.96    0.218   103.12
2027.06    0.217   102.98
2027.16    0.215   102.84
2027.26    0.214   102.70
2027.36    0.212   102.56
2027.46    0.211   102.42
2027.56    0.209   102.27
2027.66    0.207   102.12
2027.76    0.205   101.97
2027.86    0.203   101.82
2027.96    0.201   101.66
2028.06    0.199   101.50
2028.16    0.197   101.34
2028.26    0.195   101.17
2028.36    0.193   101.00
2028.46    0.190   100.82
2028.56    0.188   100.64
2028.66    0.185   100.46
2028.76    0.182   100.27
2028.86    0.180   100.07
2028.96    0.177    99.87
2029.06    0.174    99.66
2029.16    0.171    99.44
2029.26    0.167    99.22
2029.36    0.164    98.98
2029.46    0.161    98.74
2029.56    0.157    98.48
2029.66    0.153    98.22
2029.76    0.150    97.94
2029.86    0.146    97.64
2029.96    0.141    97.33
2030.06    0.137    97.00
2030.16    0.133    96.64
2030.26    0.128    96.27
2030.36    0.124    95.86
2030.46    0.119    95.42
2030.56    0.114    94.94
2030.66    0.108    94.42
2030.76    0.103    93.84
2030.86    0.097    93.20
2030.96    0.091    92.47
2031.06    0.085    91.65
2031.16    0.079    90.69
2031.26    0.072    89.55
2031.36    0.065    88.19
2031.46    0.058    86.49
2031.56    0.051    84.30
2031.66    0.043    81.35
2031.76    0.035    77.06
2031.86    0.027    70.24
2031.96    0.019    57.79
2032.06    0.013    31.60
2032.16    0.012   347.30
2032.26    0.017   314.85
2032.36    0.024   299.09
2032.46    0.030   290.28
2032.56    0.035   284.20
2032.66    0.037   279.20
2032.76    0.037   274.46
2032.86    0.035   269.48
2032.96    0.032   263.85
2033.06    0.029   257.10
2033.16    0.026   248.74
2033.26    0.023   238.20
2033.36    0.021   225.16
2033.46    0.020   210.08
2033.56    0.021   194.51
2033.66    0.022   180.36
2033.76    0.025   168.71

Disclaimer

This result is provided without warranty. For all terms, see the Full Disclaimer. Copyright (C) 2025. Unless otherwise noted, all output generated by the Double Star Calculator including orbit diagrams, ephemerides, and analytical reports is licensed under CC BY 4.0.

Acknowledgements

The Double Star Calculator - Orbital Elements makes use of the Washington Double Star Sixth Catalog of Orbits of Visual Binary Stars, maintained at the U.S. Naval Observatory.

Report Information

Double Star Calculator:		Version 1.2 ($Rev: 2397 $)
Report created:		2026-06-25 18:17:49