Double Star Calculator - Orbit

Orbital Elements for HEI598

WDS:	HEI598	WDS ID/Discoverer
P:	120.000	Orbital period (years)
a:	1.565	Semi-major axis (arcseconds)
i:	51.8	Inclination (degrees)
Ω:	42.8	Longitude of ascending node (degrees)
T:	2016.440	Epoch of periastron passage (year)
e:	0.349	Eccentricity
ω:	67.8	Longitude of periastron (degrees)
Start-Year:	1965.0	Year
End-Year:	2085.0	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for HEI598
Position:	214905.88-720608.8	Epoch-2000 right ascension and declination
WDS-ID:	21491-7206	WDS designation
Discoverer Code:	HEI598	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	.	HD catalog number
Hipparcos number:	107705	Hipparcos catalog number
V1:	10.11	Magnitude of the primary
V2:	11.17	Magnitude of the secondary
Equinox:		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:	Tok2020e	Reference

Double Star Orbit for HEI598

WDS 6th Orbit including measures of HEI598

-- 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 HEI598

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.923   184.72
--------------------------
1965.00    1.311   298.67
1966.00    1.299   301.17
1967.00    1.287   303.72
1968.00    1.277   306.31
1969.00    1.267   308.94
1970.00    1.259   311.61
1971.00    1.252   314.32
1972.00    1.246   317.05
1973.00    1.241   319.80
1974.00    1.238   322.57
1975.00    1.236   325.35
1976.00    1.235   328.14
1977.00    1.235   330.93
1978.00    1.237   333.72
1979.00    1.239   336.50
1980.00    1.243   339.26
1981.00    1.248   342.01
1982.00    1.253   344.73
1983.00    1.259   347.43
1984.00    1.265   350.11
1985.00    1.272   352.75
1986.00    1.280   355.37
1987.00    1.287   357.95
1988.00    1.295     0.51
1989.00    1.302     3.03
1990.00    1.309     5.53
1991.00    1.315     8.01
1992.00    1.320    10.46
1993.00    1.325    12.90
1994.00    1.328    15.32
1995.00    1.329    17.73
1996.00    1.329    20.14
1997.00    1.327    22.55
1998.00    1.323    24.97
1999.00    1.317    27.42
2000.00    1.307    29.89
2001.00    1.295    32.40
2002.00    1.279    34.97
2003.00    1.260    37.61
2004.00    1.237    40.34
2005.00    1.210    43.18
2006.00    1.180    46.17
2007.00    1.145    49.32
2008.00    1.106    52.68
2009.00    1.063    56.30
2010.00    1.016    60.24
2011.00    0.967    64.58
2012.00    0.915    69.39
2013.00    0.862    74.79
2014.00    0.810    80.89
2015.00    0.761    87.80
2016.00    0.716    95.63
2017.00    0.680   104.40
2018.00    0.654   114.01
2019.00    0.642   124.20
2020.00    0.644   134.55
2021.00    0.661   144.60
2022.00    0.691   153.96
2023.00    0.731   162.41
2024.00    0.780   169.88
2025.00    0.835   176.42
2026.00    0.893   182.14
2027.00    0.953   187.14
2028.00    1.013   191.55
2029.00    1.073   195.46
2030.00    1.132   198.97
2031.00    1.188   202.14
2032.00    1.242   205.02
2033.00    1.293   207.67
2034.00    1.342   210.12
2035.00    1.388   212.41
2036.00    1.430   214.55
2037.00    1.470   216.58
2038.00    1.507   218.50
2039.00    1.540   220.33
2040.00    1.571   222.09
2041.00    1.599   223.79
2042.00    1.625   225.43
2043.00    1.647   227.02
2044.00    1.667   228.57
2045.00    1.685   230.08
2046.00    1.700   231.57
2047.00    1.712   233.03
2048.00    1.723   234.48
2049.00    1.731   235.90
2050.00    1.738   237.32
2051.00    1.742   238.72
2052.00    1.745   240.12
2053.00    1.746   241.52
2054.00    1.745   242.92
2055.00    1.742   244.32
2056.00    1.738   245.73
2057.00    1.732   247.14
2058.00    1.725   248.57
2059.00    1.717   250.00
2060.00    1.708   251.45
2061.00    1.697   252.92
2062.00    1.686   254.41
2063.00    1.673   255.92
2064.00    1.660   257.46
2065.00    1.645   259.01
2066.00    1.630   260.60
2067.00    1.614   262.22
2068.00    1.598   263.87
2069.00    1.581   265.56
2070.00    1.564   267.28
2071.00    1.546   269.04
2072.00    1.529   270.84
2073.00    1.511   272.68
2074.00    1.492   274.57
2075.00    1.474   276.51
2076.00    1.456   278.49
2077.00    1.438   280.52
2078.00    1.421   282.61
2079.00    1.403   284.74
2080.00    1.386   286.93
2081.00    1.370   289.17
2082.00    1.354   291.47
2083.00    1.339   293.82
2084.00    1.325   296.22

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 18:32:07