Double Star Calculator - Orbit

Orbital Elements for A819AB

WDS:	A819AB	WDS ID/Discoverer
P:	138.600	Orbital period (years)
a:	0.421	Semi-major axis (arcseconds)
i:	48.8	Inclination (degrees)
Ω:	154.1	Longitude of ascending node (degrees)
T:	2010.800	Epoch of periastron passage (year)
e:	0.546	Eccentricity
ω:	186.8	Longitude of periastron (degrees)
Start-Year:	1955.7	Year
End-Year:	2094.3	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for A819AB
Position:	015701.33+310122.4	Epoch-2000 right ascension and declination
WDS-ID:	01570+3101	WDS designation
Discoverer Code:	A819AB	Discover designation and components
ADS number:	1548	Aitken Double Star catalog
HD number:	11849	HD catalog number
Hipparcos number:	9087	Hipparcos catalog number
V1:	8.16	Magnitude of the primary
V2:	9.30	Magnitude of the secondary
Equinox:		Equinox
Date:	2020	Date of last observation
Orbit grade:	3	Orbit grade, ranging from : 1 = Definitive 2 = Good 3 = Reliable 4 = Preliminary 5 = Indeterminate
Flags:	n	Flags
Ephemerides:		Ephemerides
Code:	Lin2022b	Reference

Double Star Orbit for A819AB

WDS 6th Orbit including measures of A819AB

-- 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 A819AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.245    95.04
--------------------------
1955.70    0.610   167.58
1956.70    0.605   168.27
1957.70    0.599   168.97
1958.70    0.594   169.69
1959.70    0.588   170.41
1960.70    0.582   171.15
1961.70    0.576   171.91
1962.70    0.569   172.69
1963.70    0.562   173.48
1964.70    0.555   174.29
1965.70    0.548   175.13
1966.70    0.540   175.99
1967.70    0.532   176.87
1968.70    0.524   177.78
1969.70    0.515   178.73
1970.70    0.506   179.70
1971.70    0.497   180.71
1972.70    0.488   181.76
1973.70    0.478   182.85
1974.70    0.468   183.99
1975.70    0.458   185.17
1976.70    0.447   186.42
1977.70    0.436   187.72
1978.70    0.425   189.09
1979.70    0.414   190.53
1980.70    0.402   192.06
1981.70    0.391   193.67
1982.70    0.379   195.39
1983.70    0.367   197.22
1984.70    0.354   199.17
1985.70    0.342   201.27
1986.70    0.330   203.52
1987.70    0.317   205.95
1988.70    0.304   208.58
1989.70    0.292   211.44
1990.70    0.280   214.56
1991.70    0.267   217.96
1992.70    0.255   221.68
1993.70    0.244   225.76
1994.70    0.233   230.23
1995.70    0.223   235.12
1996.70    0.213   240.47
1997.70    0.205   246.27
1998.70    0.198   252.53
1999.70    0.192   259.19
2000.70    0.188   266.21
2001.70    0.186   273.49
2002.70    0.185   280.91
2003.70    0.185   288.38
2004.70    0.186   295.78
2005.70    0.188   303.07
2006.70    0.190   310.21
2007.70    0.191   317.20
2008.70    0.192   324.10
2009.70    0.192   330.96
2010.70    0.191   337.89
2011.70    0.188   344.98
2012.70    0.184   352.34
2013.70    0.179     0.05
2014.70    0.175     8.16
2015.70    0.171    16.68
2016.70    0.168    25.53
2017.70    0.168    34.55
2018.70    0.169    43.53
2019.70    0.173    52.22
2020.70    0.179    60.43
2021.70    0.187    68.01
2022.70    0.197    74.89
2023.70    0.209    81.07
2024.70    0.221    86.59
2025.70    0.234    91.50
2026.70    0.248    95.88
2027.70    0.262    99.79
2028.70    0.276   103.30
2029.70    0.291   106.46
2030.70    0.305   109.32
2031.70    0.320   111.92
2032.70    0.334   114.30
2033.70    0.348   116.49
2034.70    0.362   118.51
2035.70    0.375   120.38
2036.70    0.388   122.12
2037.70    0.401   123.75
2038.70    0.414   125.28
2039.70    0.426   126.72
2040.70    0.438   128.08
2041.70    0.450   129.37
2042.70    0.461   130.59
2043.70    0.472   131.76
2044.70    0.483   132.88
2045.70    0.493   133.94
2046.70    0.503   134.97
2047.70    0.512   135.96
2048.70    0.522   136.91
2049.70    0.530   137.82
2050.70    0.539   138.71
2051.70    0.547   139.57
2052.70    0.555   140.41
2053.70    0.563   141.22
2054.70    0.570   142.02
2055.70    0.577   142.79
2056.70    0.583   143.55
2057.70    0.589   144.28
2058.70    0.595   145.01
2059.70    0.601   145.72
2060.70    0.606   146.42
2061.70    0.611   147.10
2062.70    0.616   147.78
2063.70    0.620   148.44
2064.70    0.624   149.10
2065.70    0.628   149.75
2066.70    0.631   150.39
2067.70    0.634   151.02
2068.70    0.637   151.65
2069.70    0.640   152.27
2070.70    0.642   152.89
2071.70    0.644   153.51
2072.70    0.645   154.12
2073.70    0.647   154.73
2074.70    0.648   155.33
2075.70    0.649   155.94
2076.70    0.649   156.54
2077.70    0.649   157.14
2078.70    0.649   157.75
2079.70    0.649   158.35
2080.70    0.648   158.95
2081.70    0.647   159.56
2082.70    0.646   160.17
2083.70    0.644   160.78
2084.70    0.642   161.39
2085.70    0.640   162.01
2086.70    0.637   162.64
2087.70    0.635   163.26
2088.70    0.632   163.90
2089.70    0.628   164.54
2090.70    0.625   165.18
2091.70    0.621   165.84
2092.70    0.617   166.50
2093.70    0.612   167.17

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 14:55:37