Double Star Calculator - Orbit

Orbital Elements for A770AB

WDS:	A770AB	WDS ID/Discoverer
P:	146.000	Orbital period (years)
a:	0.307	Semi-major axis (arcseconds)
i:	89.5	Inclination (degrees)
Ω:	321.4	Longitude of ascending node (degrees)
T:	1958.600	Epoch of periastron passage (year)
e:	0.2	Eccentricity
ω:	90.0	Longitude of periastron (degrees)
Start-Year:	1952.0	Year
End-Year:	2098.0	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for A770AB
Position:	213048.00+482725.4	Epoch-2000 right ascension and declination
WDS-ID:	21308+4827	WDS designation
Discoverer Code:	A770AB	Discover designation and components
ADS number:	15052	Aitken Double Star catalog
HD number:	.	HD catalog number
Hipparcos number:	.	Hipparcos catalog number
V1:	7.99	Magnitude of the primary
V2:	7.99	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2018	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:	Tok2019e	Reference

Double Star Orbit for A770AB

WDS 6th Orbit including measures of A770AB

-- 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 A770AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.055   144.71
--------------------------
1952.00    0.104   322.49
1953.00    0.089   322.70
1954.00    0.074   323.01
1955.00    0.058   323.47
1956.00    0.042   324.29
1957.00    0.026   326.12
1958.00    0.010   333.84
1959.00    0.007   123.08
1960.00    0.023   136.01
1961.00    0.039   138.26
1962.00    0.055   139.20
1963.00    0.070   139.72
1964.00    0.086   140.04
1965.00    0.101   140.27
1966.00    0.116   140.44
1967.00    0.130   140.57
1968.00    0.144   140.68
1969.00    0.158   140.77
1970.00    0.171   140.84
1971.00    0.183   140.90
1972.00    0.195   140.96
1973.00    0.207   141.01
1974.00    0.217   141.05
1975.00    0.227   141.09
1976.00    0.237   141.13
1977.00    0.246   141.16
1978.00    0.254   141.20
1979.00    0.261   141.23
1980.00    0.268   141.25
1981.00    0.274   141.28
1982.00    0.280   141.31
1983.00    0.284   141.33
1984.00    0.289   141.36
1985.00    0.292   141.38
1986.00    0.295   141.40
1987.00    0.297   141.43
1988.00    0.299   141.45
1989.00    0.300   141.47
1990.00    0.301   141.49
1991.00    0.301   141.51
1992.00    0.300   141.54
1993.00    0.299   141.56
1994.00    0.297   141.58
1995.00    0.295   141.60
1996.00    0.293   141.63
1997.00    0.290   141.65
1998.00    0.286   141.67
1999.00    0.282   141.70
2000.00    0.278   141.72
2001.00    0.273   141.75
2002.00    0.268   141.78
2003.00    0.262   141.81
2004.00    0.256   141.84
2005.00    0.250   141.87
2006.00    0.243   141.90
2007.00    0.236   141.93
2008.00    0.229   141.97
2009.00    0.221   142.01
2010.00    0.213   142.05
2011.00    0.205   142.10
2012.00    0.197   142.15
2013.00    0.188   142.20
2014.00    0.179   142.26
2015.00    0.170   142.32
2016.00    0.161   142.40
2017.00    0.151   142.48
2018.00    0.142   142.57
2019.00    0.132   142.68
2020.00    0.122   142.80
2021.00    0.112   142.95
2022.00    0.102   143.12
2023.00    0.092   143.33
2024.00    0.081   143.60
2025.00    0.071   143.95
2026.00    0.060   144.41
2027.00    0.050   145.08
2028.00    0.039   146.11
2029.00    0.028   147.92
2030.00    0.018   151.94
2031.00    0.007   167.81
2032.00    0.005   284.71
2033.00    0.015   309.39
2034.00    0.026   314.34
2035.00    0.037   316.41
2036.00    0.047   317.55
2037.00    0.058   318.27
2038.00    0.069   318.77
2039.00    0.079   319.14
2040.00    0.090   319.42
2041.00    0.100   319.64
2042.00    0.110   319.82
2043.00    0.120   319.97
2044.00    0.130   320.10
2045.00    0.140   320.21
2046.00    0.150   320.30
2047.00    0.159   320.39
2048.00    0.168   320.46
2049.00    0.177   320.53
2050.00    0.186   320.59
2051.00    0.195   320.64
2052.00    0.203   320.69
2053.00    0.212   320.74
2054.00    0.220   320.78
2055.00    0.227   320.82
2056.00    0.235   320.86
2057.00    0.242   320.89
2058.00    0.248   320.93
2059.00    0.255   320.96
2060.00    0.261   320.99
2061.00    0.266   321.02
2062.00    0.272   321.04
2063.00    0.277   321.07
2064.00    0.281   321.10
2065.00    0.285   321.12
2066.00    0.289   321.15
2067.00    0.292   321.17
2068.00    0.295   321.19
2069.00    0.297   321.21
2070.00    0.299   321.24
2071.00    0.300   321.26
2072.00    0.301   321.28
2073.00    0.301   321.30
2074.00    0.300   321.33
2075.00    0.299   321.35
2076.00    0.298   321.37
2077.00    0.296   321.39
2078.00    0.293   321.42
2079.00    0.289   321.44
2080.00    0.285   321.46
2081.00    0.281   321.49
2082.00    0.275   321.51
2083.00    0.269   321.54
2084.00    0.263   321.57
2085.00    0.255   321.60
2086.00    0.247   321.63
2087.00    0.239   321.66
2088.00    0.229   321.70
2089.00    0.219   321.74
2090.00    0.209   321.78
2091.00    0.198   321.83
2092.00    0.186   321.88
2093.00    0.173   321.95
2094.00    0.161   322.02
2095.00    0.147   322.10
2096.00    0.133   322.20
2097.00    0.119   322.33

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 18:26:57