Double Star Calculator - Orbit

Orbital Elements for A921AB

WDS:	A921AB	WDS ID/Discoverer
P:	120.470	Orbital period (years)
a:	0.221	Semi-major axis (arcseconds)
i:	59.6	Inclination (degrees)
Ω:	140.3	Longitude of ascending node (degrees)
T:	1982.400	Epoch of periastron passage (year)
e:	0.696	Eccentricity
ω:	96.6	Longitude of periastron (degrees)
Start-Year:	1964.765	Year
End-Year:	2085.235	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for A921AB
Position:	004909.10+571937.6	Epoch-2000 right ascension and declination
WDS-ID:	00492+5720	WDS designation
Discoverer Code:	A921AB	Discover designation and components
ADS number:	674	Aitken Double Star catalog
HD number:	236538	HD catalog number
Hipparcos number:	.	Hipparcos catalog number
V1:	9.0	Magnitude of the primary
V2:	9.5	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2007	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:	Cve2012	Reference

Double Star Orbit for A921AB

WDS 6th Orbit including measures of A921AB

-- 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 A921AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.183    38.83
--------------------------
1964.77    0.191   117.80
1965.77    0.188   119.28
1966.77    0.184   120.82
1967.77    0.180   122.42
1968.77    0.175   124.10
1969.77    0.170   125.87
1970.77    0.165   127.75
1971.77    0.158   129.78
1972.77    0.151   131.99
1973.77    0.143   134.44
1974.77    0.134   137.20
1975.77    0.124   140.40
1976.77    0.112   144.24
1977.77    0.098   149.07
1978.77    0.083   155.61
1979.77    0.065   165.39
1980.77    0.048   182.32
1981.77    0.035   214.76
1982.77    0.037   258.28
1983.77    0.052   286.48
1984.77    0.069   301.42
1985.77    0.084   310.54
1986.77    0.098   316.95
1987.77    0.109   321.89
1988.77    0.119   325.97
1989.77    0.127   329.48
1990.77    0.134   332.59
1991.77    0.140   335.42
1992.77    0.145   338.04
1993.77    0.149   340.49
1994.77    0.153   342.81
1995.77    0.156   345.03
1996.77    0.159   347.16
1997.77    0.162   349.23
1998.77    0.164   351.23
1999.77    0.166   353.18
2000.77    0.167   355.10
2001.77    0.169   356.98
2002.77    0.170   358.82
2003.77    0.171     0.64
2004.77    0.172     2.44
2005.77    0.173     4.22
2006.77    0.174     5.99
2007.77    0.175     7.73
2008.77    0.175     9.47
2009.77    0.176    11.19
2010.77    0.176    12.90
2011.77    0.177    14.60
2012.77    0.177    16.30
2013.77    0.178    17.98
2014.77    0.178    19.66
2015.77    0.178    21.33
2016.77    0.179    23.00
2017.77    0.179    24.65
2018.77    0.179    26.30
2019.77    0.180    27.95
2020.77    0.180    29.58
2021.77    0.181    31.21
2022.77    0.181    32.83
2023.77    0.181    34.45
2024.77    0.182    36.06
2025.77    0.182    37.66
2026.77    0.183    39.25
2027.77    0.183    40.83
2028.77    0.184    42.40
2029.77    0.184    43.97
2030.77    0.185    45.52
2031.77    0.186    47.07
2032.77    0.186    48.61
2033.77    0.187    50.13
2034.77    0.187    51.65
2035.77    0.188    53.15
2036.77    0.189    54.64
2037.77    0.190    56.13
2038.77    0.190    57.60
2039.77    0.191    59.06
2040.77    0.192    60.50
2041.77    0.193    61.94
2042.77    0.193    63.36
2043.77    0.194    64.78
2044.77    0.195    66.18
2045.77    0.196    67.56
2046.77    0.197    68.94
2047.77    0.197    70.31
2048.77    0.198    71.66
2049.77    0.199    73.00
2050.77    0.200    74.34
2051.77    0.201    75.66
2052.77    0.202    76.97
2053.77    0.202    78.27
2054.77    0.203    79.56
2055.77    0.204    80.84
2056.77    0.205    82.11
2057.77    0.205    83.37
2058.77    0.206    84.62
2059.77    0.207    85.87
2060.77    0.207    87.11
2061.77    0.208    88.34
2062.77    0.208    89.57
2063.77    0.209    90.79
2064.77    0.209    92.01
2065.77    0.209    93.22
2066.77    0.210    94.43
2067.77    0.210    95.63
2068.77    0.210    96.84
2069.77    0.210    98.04
2070.77    0.210    99.25
2071.77    0.209   100.46
2072.77    0.209   101.67
2073.77    0.209   102.88
2074.77    0.208   104.10
2075.77    0.207   105.33
2076.77    0.207   106.57
2077.77    0.206   107.82
2078.77    0.204   109.08
2079.77    0.203   110.36
2080.77    0.201   111.66
2081.77    0.199   112.98
2082.77    0.197   114.33
2083.77    0.195   115.71
2084.77    0.192   117.12

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 14:43:33