Double Star Calculator - Orbit

Orbital Elements for DON7

WDS:	DON7	WDS ID/Discoverer
P:	150.000	Orbital period (years)
a:	0.608	Semi-major axis (arcseconds)
i:	180.0	Inclination (degrees)
Ω:	175.0	Longitude of ascending node (degrees)
T:	2037.800	Epoch of periastron passage (year)
e:	0.186	Eccentricity
ω:	337.0	Longitude of periastron (degrees)
Start-Year:	1950.0	Year
End-Year:	2100.0	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for DON7
Position:	003228.68-680026.8	Epoch-2000 right ascension and declination
WDS-ID:	00325-6800	WDS designation
Discoverer Code:	DON7	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	2989	HD catalog number
Hipparcos number:	2556	Hipparcos catalog number
V1:	10.32	Magnitude of the primary
V2:	10.06	Magnitude of the secondary
Equinox:		Equinox
Date:	2019	Date of last observation
Orbit grade:	4	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 DON7

WDS 6th Orbit including measures of DON7

-- 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 DON7

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.513   237.24
--------------------------
1950.00    0.710    39.69
1951.00    0.711    37.96
1952.00    0.713    36.24
1953.00    0.714    34.53
1954.00    0.716    32.83
1955.00    0.717    31.13
1956.00    0.718    29.43
1957.00    0.719    27.74
1958.00    0.719    26.06
1959.00    0.720    24.38
1960.00    0.721    22.70
1961.00    0.721    21.02
1962.00    0.721    19.34
1963.00    0.721    17.66
1964.00    0.721    15.99
1965.00    0.721    14.31
1966.00    0.720    12.63
1967.00    0.720    10.95
1968.00    0.719     9.27
1969.00    0.718     7.58
1970.00    0.717     5.89
1971.00    0.716     4.19
1972.00    0.715     2.49
1973.00    0.714     0.78
1974.00    0.712   359.07
1975.00    0.711   357.35
1976.00    0.709   355.62
1977.00    0.707   353.88
1978.00    0.705   352.13
1979.00    0.703   350.37
1980.00    0.700   348.60
1981.00    0.698   346.81
1982.00    0.695   345.02
1983.00    0.693   343.21
1984.00    0.690   341.39
1985.00    0.687   339.55
1986.00    0.684   337.69
1987.00    0.681   335.82
1988.00    0.678   333.93
1989.00    0.674   332.02
1990.00    0.671   330.09
1991.00    0.667   328.15
1992.00    0.663   326.17
1993.00    0.659   324.18
1994.00    0.655   322.16
1995.00    0.651   320.12
1996.00    0.647   318.05
1997.00    0.643   315.96
1998.00    0.639   313.84
1999.00    0.634   311.69
2000.00    0.630   309.51
2001.00    0.625   307.29
2002.00    0.621   305.05
2003.00    0.616   302.77
2004.00    0.611   300.46
2005.00    0.607   298.11
2006.00    0.602   295.72
2007.00    0.597   293.30
2008.00    0.592   290.83
2009.00    0.588   288.33
2010.00    0.583   285.78
2011.00    0.578   283.19
2012.00    0.573   280.56
2013.00    0.568   277.89
2014.00    0.564   275.17
2015.00    0.559   272.40
2016.00    0.554   269.59
2017.00    0.550   266.73
2018.00    0.545   263.82
2019.00    0.541   260.87
2020.00    0.537   257.86
2021.00    0.533   254.82
2022.00    0.529   251.72
2023.00    0.525   248.58
2024.00    0.521   245.40
2025.00    0.518   242.17
2026.00    0.515   238.90
2027.00    0.512   235.58
2028.00    0.509   232.23
2029.00    0.506   228.85
2030.00    0.504   225.43
2031.00    0.502   221.98
2032.00    0.500   218.50
2033.00    0.498   215.00
2034.00    0.497   211.48
2035.00    0.496   207.95
2036.00    0.495   204.40
2037.00    0.495   200.85
2038.00    0.495   197.29
2039.00    0.495   193.73
2040.00    0.496   190.18
2041.00    0.496   186.63
2042.00    0.498   183.11
2043.00    0.499   179.59
2044.00    0.501   176.10
2045.00    0.503   172.64
2046.00    0.505   169.20
2047.00    0.507   165.79
2048.00    0.510   162.42
2049.00    0.513   159.09
2050.00    0.516   155.79
2051.00    0.519   152.54
2052.00    0.523   149.33
2053.00    0.526   146.16
2054.00    0.530   143.04
2055.00    0.534   139.96
2056.00    0.539   136.93
2057.00    0.543   133.95
2058.00    0.547   131.01
2059.00    0.552   128.12
2060.00    0.556   125.28
2061.00    0.561   122.49
2062.00    0.566   119.74
2063.00    0.570   117.04
2064.00    0.575   114.38
2065.00    0.580   111.77
2066.00    0.585   109.20
2067.00    0.590   106.67
2068.00    0.594   104.18
2069.00    0.599   101.73
2070.00    0.604    99.32
2071.00    0.609    96.95
2072.00    0.613    94.61
2073.00    0.618    92.32
2074.00    0.623    90.05
2075.00    0.627    87.82
2076.00    0.632    85.62
2077.00    0.636    83.45
2078.00    0.640    81.31
2079.00    0.645    79.20
2080.00    0.649    77.12
2081.00    0.653    75.06
2082.00    0.657    73.03
2083.00    0.661    71.02
2084.00    0.665    69.03
2085.00    0.668    67.07
2086.00    0.672    65.13
2087.00    0.675    63.21
2088.00    0.679    61.31
2089.00    0.682    59.43
2090.00    0.685    57.56
2091.00    0.688    55.71
2092.00    0.691    53.88
2093.00    0.694    52.06
2094.00    0.697    50.26
2095.00    0.699    48.47
2096.00    0.701    46.69
2097.00    0.704    44.93
2098.00    0.706    43.17
2099.00    0.708    41.43

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 14:40:30