Double Star Calculator - Orbit

Orbital Elements for LDS720BC

WDS:	LDS720BC	WDS ID/Discoverer
P:	145.400	Orbital period (years)
a:	2.529	Semi-major axis (arcseconds)
i:	166.1	Inclination (degrees)
Ω:	100.0	Longitude of ascending node (degrees)
T:	2033.200	Epoch of periastron passage (year)
e:	0.574	Eccentricity
ω:	65.0	Longitude of periastron (degrees)
Start-Year:	1952.3	Year
End-Year:	2097.7	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for LDS720BC
Position:	204151.16-322606.7	Epoch-2000 right ascension and declination
WDS-ID:	20452-3120	WDS designation
Discoverer Code:	LDS720BC	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	196982	HD catalog number
Hipparcos number:	102141	Hipparcos catalog number
V1:	11.36	Magnitude of the primary
V2:	11.49	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2022	Date of last observation
Orbit grade:	4	Orbit grade, ranging from : 1 = Definitive 2 = Good 3 = Reliable 4 = Preliminary 5 = Indeterminate
Flags:	n	Flags
Ephemerides:		Ephemerides
Code:	Tok2023e	Reference

Double Star Orbit for LDS720BC

WDS 6th Orbit including measures of LDS720BC

-- 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 LDS720BC

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    1.352    98.78
--------------------------
1952.30    3.861   222.52
1953.30    3.867   221.68
1954.30    3.873   220.84
1955.30    3.878   220.00
1956.30    3.881   219.16
1957.30    3.884   218.33
1958.30    3.885   217.49
1959.30    3.886   216.66
1960.30    3.885   215.83
1961.30    3.884   214.99
1962.30    3.881   214.16
1963.30    3.877   213.32
1964.30    3.873   212.48
1965.30    3.867   211.64
1966.30    3.860   210.80
1967.30    3.852   209.95
1968.30    3.844   209.10
1969.30    3.834   208.25
1970.30    3.823   207.39
1971.30    3.811   206.52
1972.30    3.798   205.65
1973.30    3.784   204.78
1974.30    3.769   203.90
1975.30    3.753   203.01
1976.30    3.735   202.11
1977.30    3.717   201.20
1978.30    3.698   200.29
1979.30    3.677   199.36
1980.30    3.656   198.42
1981.30    3.633   197.48
1982.30    3.610   196.52
1983.30    3.585   195.54
1984.30    3.559   194.56
1985.30    3.532   193.56
1986.30    3.504   192.54
1987.30    3.475   191.50
1988.30    3.444   190.45
1989.30    3.413   189.38
1990.30    3.380   188.29
1991.30    3.346   187.18
1992.30    3.311   186.04
1993.30    3.275   184.88
1994.30    3.238   183.69
1995.30    3.199   182.48
1996.30    3.159   181.23
1997.30    3.118   179.96
1998.30    3.076   178.64
1999.30    3.032   177.29
2000.30    2.987   175.90
2001.30    2.941   174.47
2002.30    2.893   172.99
2003.30    2.844   171.46
2004.30    2.794   169.88
2005.30    2.743   168.24
2006.30    2.690   166.53
2007.30    2.635   164.75
2008.30    2.580   162.90
2009.30    2.522   160.97
2010.30    2.464   158.94
2011.30    2.404   156.82
2012.30    2.342   154.58
2013.30    2.279   152.22
2014.30    2.215   149.73
2015.30    2.149   147.09
2016.30    2.082   144.28
2017.30    2.014   141.27
2018.30    1.944   138.06
2019.30    1.873   134.60
2020.30    1.802   130.88
2021.30    1.729   126.84
2022.30    1.656   122.44
2023.30    1.582   117.63
2024.30    1.509   112.36
2025.30    1.437   106.56
2026.30    1.366   100.14
2027.30    1.298    93.04
2028.30    1.235    85.19
2029.30    1.177    76.51
2030.30    1.127    67.01
2031.30    1.088    56.73
2032.30    1.062    45.82
2033.30    1.051    34.52
2034.30    1.056    23.15
2035.30    1.077    12.06
2036.30    1.113     1.53
2037.30    1.161   351.78
2038.30    1.220   342.88
2039.30    1.286   334.84
2040.30    1.358   327.63
2041.30    1.433   321.16
2042.30    1.511   315.34
2043.30    1.590   310.10
2044.30    1.669   305.36
2045.30    1.748   301.05
2046.30    1.827   297.10
2047.30    1.904   293.49
2048.30    1.980   290.15
2049.30    2.054   287.05
2050.30    2.127   284.17
2051.30    2.198   281.48
2052.30    2.268   278.96
2053.30    2.336   276.58
2054.30    2.402   274.34
2055.30    2.466   272.21
2056.30    2.529   270.19
2057.30    2.590   268.27
2058.30    2.649   266.44
2059.30    2.706   264.68
2060.30    2.762   263.00
2061.30    2.816   261.38
2062.30    2.869   259.82
2063.30    2.920   258.32
2064.30    2.969   256.87
2065.30    3.017   255.46
2066.30    3.064   254.10
2067.30    3.108   252.78
2068.30    3.152   251.49
2069.30    3.194   250.24
2070.30    3.234   249.03
2071.30    3.274   247.84
2072.30    3.311   246.68
2073.30    3.348   245.54
2074.30    3.383   244.43
2075.30    3.417   243.34
2076.30    3.449   242.27
2077.30    3.481   241.22
2078.30    3.511   240.19
2079.30    3.539   239.18
2080.30    3.567   238.18
2081.30    3.593   237.20
2082.30    3.618   236.23
2083.30    3.642   235.28
2084.30    3.665   234.34
2085.30    3.686   233.40
2086.30    3.707   232.48
2087.30    3.726   231.57
2088.30    3.744   230.67
2089.30    3.761   229.78
2090.30    3.777   228.89
2091.30    3.792   228.01
2092.30    3.806   227.14
2093.30    3.818   226.27
2094.30    3.830   225.41
2095.30    3.840   224.56
2096.30    3.849   223.70
2097.30    3.858   222.86

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 18:18:05