Double Star Calculator - Orbit

Orbital Elements for ST8AB

WDS:	ST8AB	WDS ID/Discoverer
P:	123.760	Orbital period (years)
a:	2.664	Semi-major axis (arcseconds)
i:	106.5	Inclination (degrees)
Ω:	180.5	Longitude of ascending node (degrees)
T:	1925.360	Epoch of periastron passage (year)
e:	0.617	Eccentricity
ω:	260.5	Longitude of periastron (degrees)
Start-Year:	1963.12	Year
End-Year:	2086.88	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for ST8AB
Position:	084244.52+093324.1	Epoch-2000 right ascension and declination
WDS-ID:	08427+0935	WDS designation
Discoverer Code:	ST8AB	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	.	HD catalog number
Hipparcos number:	42748	Hipparcos catalog number
V1:	9.7	Magnitude of the primary
V2:	13.2	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:	n	Flags
Ephemerides:		Ephemerides
Code:	USN2021c	Reference

Double Star Orbit for ST8AB

WDS 6th Orbit including measures of ST8AB

-- 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 ST8AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    1.818    22.93
--------------------------
1963.12    2.243   156.35
1964.12    2.214   155.43
1965.12    2.183   154.47
1966.12    2.152   153.49
1967.12    2.119   152.48
1968.12    2.086   151.43
1969.12    2.051   150.36
1970.12    2.016   149.24
1971.12    1.980   148.08
1972.12    1.944   146.89
1973.12    1.907   145.64
1974.12    1.870   144.35
1975.12    1.832   143.00
1976.12    1.795   141.60
1977.12    1.757   140.14
1978.12    1.719   138.61
1979.12    1.682   137.01
1980.12    1.645   135.34
1981.12    1.608   133.60
1982.12    1.572   131.77
1983.12    1.536   129.86
1984.12    1.502   127.86
1985.12    1.468   125.77
1986.12    1.435   123.58
1987.12    1.404   121.29
1988.12    1.374   118.90
1989.12    1.346   116.40
1990.12    1.320   113.81
1991.12    1.296   111.11
1992.12    1.274   108.31
1993.12    1.254   105.43
1994.12    1.237   102.45
1995.12    1.223    99.40
1996.12    1.211    96.28
1997.12    1.202    93.11
1998.12    1.196    89.90
1999.12    1.193    86.67
2000.12    1.193    83.42
2001.12    1.196    80.19
2002.12    1.203    76.98
2003.12    1.212    73.82
2004.12    1.223    70.70
2005.12    1.238    67.65
2006.12    1.255    64.68
2007.12    1.274    61.79
2008.12    1.295    59.00
2009.12    1.319    56.30
2010.12    1.344    53.69
2011.12    1.371    51.19
2012.12    1.399    48.78
2013.12    1.428    46.47
2014.12    1.458    44.25
2015.12    1.489    42.13
2016.12    1.520    40.09
2017.12    1.551    38.13
2018.12    1.583    36.25
2019.12    1.614    34.45
2020.12    1.645    32.71
2021.12    1.676    31.04
2022.12    1.705    29.42
2023.12    1.734    27.86
2024.12    1.761    26.35
2025.12    1.786    24.88
2026.12    1.810    23.46
2027.12    1.831    22.07
2028.12    1.850    20.71
2029.12    1.866    19.37
2030.12    1.879    18.05
2031.12    1.888    16.75
2032.12    1.893    15.46
2033.12    1.892    14.18
2034.12    1.887    12.88
2035.12    1.874    11.58
2036.12    1.855    10.25
2037.12    1.827     8.89
2038.12    1.790     7.48
2039.12    1.742     6.01
2040.12    1.682     4.43
2041.12    1.606     2.73
2042.12    1.514     0.84
2043.12    1.403   358.67
2044.12    1.269   356.09
2045.12    1.112   352.83
2046.12    0.929   348.38
2047.12    0.725   341.56
2048.12    0.511   329.11
2049.12    0.332   301.01
2050.12    0.311   250.31
2051.12    0.475   217.55
2052.12    0.690   203.40
2053.12    0.905   196.03
2054.12    1.105   191.43
2055.12    1.286   188.19
2056.12    1.448   185.72
2057.12    1.592   183.72
2058.12    1.719   182.03
2059.12    1.831   180.57
2060.12    1.930   179.27
2061.12    2.017   178.08
2062.12    2.093   176.99
2063.12    2.159   175.97
2064.12    2.216   175.01
2065.12    2.266   174.09
2066.12    2.308   173.21
2067.12    2.343   172.35
2068.12    2.373   171.52
2069.12    2.397   170.71
2070.12    2.416   169.92
2071.12    2.430   169.13
2072.12    2.440   168.35
2073.12    2.446   167.58
2074.12    2.448   166.81
2075.12    2.447   166.04
2076.12    2.442   165.27
2077.12    2.435   164.49
2078.12    2.425   163.71
2079.12    2.412   162.92
2080.12    2.397   162.12
2081.12    2.380   161.31
2082.12    2.360   160.49
2083.12    2.339   159.66
2084.12    2.316   158.80
2085.12    2.291   157.94
2086.12    2.264   157.05

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 16:09:53