Double Star Calculator - Orbit

Orbital Elements for D15

WDS:	D15	WDS ID/Discoverer
P:	120.050	Orbital period (years)
a:	0.975	Semi-major axis (arcseconds)
i:	118.2	Inclination (degrees)
Ω:	145.6	Longitude of ascending node (degrees)
T:	1895.020	Epoch of periastron passage (year)
e:	0.418	Eccentricity
ω:	149.7	Longitude of periastron (degrees)
Start-Year:	1964.975	Year
End-Year:	2085.025	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for D15
Position:	164356.29+432831.2	Epoch-2000 right ascension and declination
WDS-ID:	16439+4329	WDS designation
Discoverer Code:	D15	Discover designation and components
ADS number:	10188	Aitken Double Star catalog
HD number:	151188	HD catalog number
Hipparcos number:	81919	Hipparcos catalog number
V1:	9.04	Magnitude of the primary
V2:	9.27	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2007	Date of last observation
Orbit grade:	2	Orbit grade, ranging from : 1 = Definitive 2 = Good 3 = Reliable 4 = Preliminary 5 = Indeterminate
Flags:	n	Flags
Ephemerides:		Ephemerides
Code:	Alz2007	Reference

Double Star Orbit for D15

WDS 6th Orbit including measures of D15

-- 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 D15

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.566   299.42
--------------------------
1964.97    1.311   153.65
1965.97    1.313   152.94
1966.97    1.313   152.23
1967.97    1.312   151.52
1968.97    1.310   150.81
1969.97    1.307   150.09
1970.97    1.302   149.37
1971.97    1.296   148.65
1972.97    1.289   147.92
1973.97    1.281   147.18
1974.97    1.271   146.42
1975.97    1.260   145.66
1976.97    1.248   144.88
1977.97    1.234   144.09
1978.97    1.218   143.27
1979.97    1.202   142.44
1980.97    1.184   141.58
1981.97    1.164   140.69
1982.97    1.143   139.77
1983.97    1.120   138.81
1984.97    1.096   137.82
1985.97    1.070   136.77
1986.97    1.043   135.68
1987.97    1.014   134.52
1988.97    0.983   133.29
1989.97    0.951   131.98
1990.97    0.917   130.58
1991.97    0.881   129.06
1992.97    0.844   127.42
1993.97    0.805   125.62
1994.97    0.765   123.63
1995.97    0.724   121.42
1996.97    0.681   118.94
1997.97    0.637   116.12
1998.97    0.593   112.88
1999.97    0.548   109.11
2000.97    0.503   104.67
2001.97    0.460    99.38
2002.97    0.419    93.02
2003.97    0.381    85.33
2004.97    0.349    76.10
2005.97    0.325    65.28
2006.97    0.312    53.17
2007.97    0.311    40.50
2008.97    0.322    28.23
2009.97    0.343    17.12
2010.97    0.372     7.51
2011.97    0.405   359.37
2012.97    0.439   352.48
2013.97    0.473   346.60
2014.97    0.505   341.49
2015.97    0.534   336.96
2016.97    0.558   332.86
2017.97    0.577   329.07
2018.97    0.592   325.49
2019.97    0.601   322.05
2020.97    0.605   318.69
2021.97    0.605   315.35
2022.97    0.601   312.00
2023.97    0.594   308.58
2024.97    0.585   305.06
2025.97    0.573   301.40
2026.97    0.559   297.58
2027.97    0.545   293.57
2028.97    0.531   289.34
2029.97    0.517   284.88
2030.97    0.503   280.18
2031.97    0.492   275.23
2032.97    0.482   270.06
2033.97    0.474   264.69
2034.97    0.469   259.18
2035.97    0.467   253.59
2036.97    0.468   247.98
2037.97    0.472   242.44
2038.97    0.479   237.02
2039.97    0.490   231.80
2040.97    0.503   226.83
2041.97    0.518   222.12
2042.97    0.536   217.71
2043.97    0.555   213.60
2044.97    0.577   209.78
2045.97    0.599   206.24
2046.97    0.623   202.96
2047.97    0.648   199.93
2048.97    0.673   197.12
2049.97    0.699   194.52
2050.97    0.725   192.10
2051.97    0.751   189.85
2052.97    0.777   187.76
2053.97    0.804   185.80
2054.97    0.830   183.96
2055.97    0.856   182.24
2056.97    0.881   180.62
2057.97    0.907   179.08
2058.97    0.931   177.64
2059.97    0.956   176.26
2060.97    0.979   174.95
2061.97    1.003   173.71
2062.97    1.025   172.52
2063.97    1.047   171.38
2064.97    1.068   170.28
2065.97    1.089   169.23
2066.97    1.109   168.22
2067.97    1.128   167.24
2068.97    1.146   166.29
2069.97    1.163   165.37
2070.97    1.180   164.48
2071.97    1.195   163.61
2072.97    1.210   162.77
2073.97    1.224   161.94
2074.97    1.237   161.13
2075.97    1.249   160.34
2076.97    1.260   159.56
2077.97    1.270   158.80
2078.97    1.279   158.04
2079.97    1.287   157.30
2080.97    1.294   156.57
2081.97    1.300   155.84
2082.97    1.305   155.12
2083.97    1.308   154.40
2084.97    1.311   153.69

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 17:30:26