Double Star Calculator - Orbit

Orbital Elements for HDS2931

WDS:	HDS2931	WDS ID/Discoverer
P:	140.000	Orbital period (years)
a:	0.213	Semi-major axis (arcseconds)
i:	38.0	Inclination (degrees)
Ω:	54.7	Longitude of ascending node (degrees)
T:	2010.730	Epoch of periastron passage (year)
e:	0.645	Eccentricity
ω:	309.3	Longitude of periastron (degrees)
Start-Year:	1955.0	Year
End-Year:	2095.0	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for HDS2931
Position:	202958.35-773925.6	Epoch-2000 right ascension and declination
WDS-ID:	20300-7739	WDS designation
Discoverer Code:	HDS2931	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	193698	HD catalog number
Hipparcos number:	101129	Hipparcos catalog number
V1:	9.57	Magnitude of the primary
V2:	10.33	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2019	Date of last observation
Orbit grade:	5	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 HDS2931

WDS 6th Orbit including measures of HDS2931

-- 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 HDS2931

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.148   117.87
--------------------------
1955.00    0.312   201.11
1956.00    0.312   201.83
1957.00    0.311   202.56
1958.00    0.310   203.29
1959.00    0.309   204.02
1960.00    0.309   204.75
1961.00    0.307   205.49
1962.00    0.306   206.24
1963.00    0.305   206.99
1964.00    0.304   207.75
1965.00    0.302   208.52
1966.00    0.301   209.29
1967.00    0.299   210.07
1968.00    0.297   210.86
1969.00    0.295   211.67
1970.00    0.293   212.48
1971.00    0.290   213.31
1972.00    0.288   214.15
1973.00    0.285   215.00
1974.00    0.283   215.87
1975.00    0.280   216.76
1976.00    0.277   217.67
1977.00    0.273   218.60
1978.00    0.270   219.55
1979.00    0.266   220.53
1980.00    0.263   221.53
1981.00    0.259   222.57
1982.00    0.255   223.63
1983.00    0.250   224.74
1984.00    0.246   225.88
1985.00    0.241   227.07
1986.00    0.236   228.30
1987.00    0.231   229.59
1988.00    0.225   230.94
1989.00    0.220   232.36
1990.00    0.214   233.86
1991.00    0.207   235.45
1992.00    0.201   237.13
1993.00    0.194   238.93
1994.00    0.187   240.87
1995.00    0.179   242.96
1996.00    0.172   245.24
1997.00    0.164   247.74
1998.00    0.155   250.51
1999.00    0.146   253.61
2000.00    0.137   257.11
2001.00    0.128   261.12
2002.00    0.118   265.79
2003.00    0.108   271.32
2004.00    0.098   277.97
2005.00    0.088   286.13
2006.00    0.079   296.25
2007.00    0.071   308.81
2008.00    0.066   323.96
2009.00    0.063   341.11
2010.00    0.064   358.68
2011.00    0.068    15.00
2012.00    0.073    29.19
2013.00    0.080    41.23
2014.00    0.086    51.47
2015.00    0.092    60.30
2016.00    0.098    68.05
2017.00    0.104    74.95
2018.00    0.109    81.17
2019.00    0.114    86.84
2020.00    0.119    92.03
2021.00    0.123    96.82
2022.00    0.128   101.26
2023.00    0.133   105.39
2024.00    0.137   109.24
2025.00    0.142   112.86
2026.00    0.146   116.25
2027.00    0.151   119.44
2028.00    0.155   122.45
2029.00    0.159   125.29
2030.00    0.164   127.98
2031.00    0.168   130.54
2032.00    0.172   132.97
2033.00    0.177   135.27
2034.00    0.181   137.48
2035.00    0.185   139.58
2036.00    0.189   141.59
2037.00    0.193   143.51
2038.00    0.197   145.36
2039.00    0.201   147.13
2040.00    0.205   148.83
2041.00    0.209   150.47
2042.00    0.213   152.05
2043.00    0.217   153.58
2044.00    0.220   155.05
2045.00    0.224   156.47
2046.00    0.228   157.85
2047.00    0.231   159.19
2048.00    0.234   160.49
2049.00    0.238   161.75
2050.00    0.241   162.97
2051.00    0.245   164.16
2052.00    0.248   165.32
2053.00    0.251   166.45
2054.00    0.254   167.55
2055.00    0.257   168.63
2056.00    0.260   169.68
2057.00    0.263   170.71
2058.00    0.265   171.72
2059.00    0.268   172.71
2060.00    0.271   173.67
2061.00    0.273   174.62
2062.00    0.276   175.55
2063.00    0.278   176.47
2064.00    0.281   177.37
2065.00    0.283   178.25
2066.00    0.285   179.12
2067.00    0.287   179.98
2068.00    0.289   180.83
2069.00    0.291   181.66
2070.00    0.293   182.48
2071.00    0.295   183.30
2072.00    0.297   184.10
2073.00    0.298   184.89
2074.00    0.300   185.68
2075.00    0.301   186.46
2076.00    0.303   187.23
2077.00    0.304   187.99
2078.00    0.305   188.75
2079.00    0.306   189.50
2080.00    0.307   190.25
2081.00    0.308   190.99
2082.00    0.309   191.72
2083.00    0.310   192.46
2084.00    0.311   193.19
2085.00    0.311   193.91
2086.00    0.312   194.64
2087.00    0.312   195.36
2088.00    0.312   196.08
2089.00    0.313   196.80
2090.00    0.313   197.52
2091.00    0.313   198.23
2092.00    0.313   198.95
2093.00    0.313   199.67
2094.00    0.312   200.39

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 18:15:31