Double Star Calculator - Orbit

Orbital Elements for B915AB

WDS:	B915AB	WDS ID/Discoverer
P:	128.400	Orbital period (years)
a:	0.278	Semi-major axis (arcseconds)
i:	65.2	Inclination (degrees)
Ω:	314.2	Longitude of ascending node (degrees)
T:	2147.000	Epoch of periastron passage (year)
e:	0.052	Eccentricity
ω:	25.0	Longitude of periastron (degrees)
Start-Year:	1960.8	Year
End-Year:	2089.2	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for B915AB
Position:	173730.32-374654.9	Epoch-2000 right ascension and declination
WDS-ID:	17375-3747	WDS designation
Discoverer Code:	B915AB	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	159632	HD catalog number
Hipparcos number:	.	Hipparcos catalog number
V1:	8.6	Magnitude of the primary
V2:	8.8	Magnitude of the secondary
Equinox:		Equinox
Date:		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:	Msn2023	Reference

Double Star Orbit for B915AB

WDS 6th Orbit including measures of B915AB

-- 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 B915AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.191   340.39
--------------------------
1960.80    0.234   154.37
1961.80    0.227   156.08
1962.80    0.220   157.90
1963.80    0.212   159.85
1964.80    0.205   161.93
1965.80    0.197   164.18
1966.80    0.189   166.61
1967.80    0.182   169.24
1968.80    0.174   172.12
1969.80    0.166   175.26
1970.80    0.159   178.70
1971.80    0.152   182.47
1972.80    0.145   186.61
1973.80    0.139   191.14
1974.80    0.133   196.08
1975.80    0.128   201.42
1976.80    0.124   207.14
1977.80    0.121   213.18
1978.80    0.119   219.46
1979.80    0.119   225.86
1980.80    0.120   232.26
1981.80    0.121   238.53
1982.80    0.124   244.55
1983.80    0.128   250.24
1984.80    0.133   255.56
1985.80    0.139   260.47
1986.80    0.145   264.98
1987.80    0.152   269.10
1988.80    0.159   272.86
1989.80    0.166   276.30
1990.80    0.174   279.45
1991.80    0.181   282.34
1992.80    0.189   284.99
1993.80    0.196   287.45
1994.80    0.203   289.73
1995.80    0.210   291.85
1996.80    0.217   293.84
1997.80    0.223   295.71
1998.80    0.230   297.48
1999.80    0.235   299.16
2000.80    0.240   300.77
2001.80    0.245   302.31
2002.80    0.250   303.79
2003.80    0.253   305.22
2004.80    0.257   306.62
2005.80    0.260   307.98
2006.80    0.262   309.31
2007.80    0.263   310.63
2008.80    0.264   311.93
2009.80    0.265   313.23
2010.80    0.265   314.52
2011.80    0.264   315.82
2012.80    0.263   317.13
2013.80    0.261   318.46
2014.80    0.258   319.81
2015.80    0.255   321.18
2016.80    0.251   322.60
2017.80    0.247   324.06
2018.80    0.242   325.57
2019.80    0.237   327.15
2020.80    0.231   328.81
2021.80    0.225   330.55
2022.80    0.219   332.39
2023.80    0.212   334.35
2024.80    0.204   336.45
2025.80    0.197   338.70
2026.80    0.189   341.14
2027.80    0.181   343.79
2028.80    0.173   346.68
2029.80    0.165   349.86
2030.80    0.157   353.35
2031.80    0.150   357.21
2032.80    0.142     1.48
2033.80    0.135     6.19
2034.80    0.129    11.38
2035.80    0.124    17.06
2036.80    0.119    23.20
2037.80    0.116    29.74
2038.80    0.114    36.58
2039.80    0.114    43.57
2040.80    0.115    50.55
2041.80    0.117    57.34
2042.80    0.120    63.81
2043.80    0.125    69.85
2044.80    0.131    75.43
2045.80    0.137    80.51
2046.80    0.144    85.12
2047.80    0.152    89.28
2048.80    0.159    93.04
2049.80    0.168    96.44
2050.80    0.176    99.52
2051.80    0.184   102.33
2052.80    0.192   104.89
2053.80    0.201   107.24
2054.80    0.209   109.41
2055.80    0.216   111.42
2056.80    0.224   113.30
2057.80    0.231   115.05
2058.80    0.238   116.70
2059.80    0.245   118.25
2060.80    0.251   119.73
2061.80    0.257   121.14
2062.80    0.262   122.48
2063.80    0.267   123.78
2064.80    0.272   125.03
2065.80    0.276   126.23
2066.80    0.280   127.41
2067.80    0.283   128.56
2068.80    0.285   129.68
2069.80    0.288   130.79
2070.80    0.289   131.88
2071.80    0.290   132.96
2072.80    0.291   134.04
2073.80    0.291   135.11
2074.80    0.291   136.18
2075.80    0.290   137.26
2076.80    0.288   138.34
2077.80    0.287   139.44
2078.80    0.284   140.56
2079.80    0.281   141.69
2080.80    0.278   142.85
2081.80    0.274   144.04
2082.80    0.270   145.27
2083.80    0.265   146.53
2084.80    0.260   147.85
2085.80    0.255   149.21
2086.80    0.249   150.64
2087.80    0.243   152.14
2088.80    0.237   153.72

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 17:41:15