Double Star Calculator - Orbit

Orbital Elements for I987

WDS:	I987	WDS ID/Discoverer
P:	102.470	Orbital period (years)
a:	0.384	Semi-major axis (arcseconds)
i:	15.9	Inclination (degrees)
Ω:	59.3	Longitude of ascending node (degrees)
T:	1952.080	Epoch of periastron passage (year)
e:	0.262	Eccentricity
ω:	12.2	Longitude of periastron (degrees)
Start-Year:	1973.765	Year
End-Year:	2076.235	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for I987
Position:	161658.92-534146.3	Epoch-2000 right ascension and declination
WDS-ID:	16170-5342	WDS designation
Discoverer Code:	I987	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	146059	HD catalog number
Hipparcos number:	79787	Hipparcos catalog number
V1:	6.63	Magnitude of the primary
V2:	8.77	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2014	Date of last observation
Orbit grade:	3	Orbit grade, ranging from : 1 = Definitive 2 = Good 3 = Reliable 4 = Preliminary 5 = Indeterminate
Flags:		Flags
Ephemerides:		Ephemerides
Code:	Tok2015c	Reference

Double Star Orbit for I987

WDS 6th Orbit including measures of I987

-- 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 I987

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.409   304.87
--------------------------
1973.77    0.375   178.78
1974.77    0.381   182.15
1975.77    0.388   185.40
1976.77    0.394   188.54
1977.77    0.401   191.58
1978.77    0.407   194.53
1979.77    0.413   197.39
1980.77    0.419   200.17
1981.77    0.425   202.87
1982.77    0.430   205.50
1983.77    0.435   208.07
1984.77    0.440   210.58
1985.77    0.445   213.03
1986.77    0.449   215.44
1987.77    0.454   217.80
1988.77    0.458   220.11
1989.77    0.461   222.39
1990.77    0.465   224.63
1991.77    0.468   226.84
1992.77    0.471   229.02
1993.77    0.473   231.18
1994.77    0.476   233.31
1995.77    0.478   235.43
1996.77    0.480   237.53
1997.77    0.481   239.61
1998.77    0.482   241.69
1999.77    0.483   243.75
2000.77    0.484   245.81
2001.77    0.484   247.86
2002.77    0.484   249.92
2003.77    0.484   251.97
2004.77    0.483   254.03
2005.77    0.482   256.09
2006.77    0.481   258.16
2007.77    0.480   260.25
2008.77    0.478   262.34
2009.77    0.476   264.45
2010.77    0.474   266.58
2011.77    0.472   268.74
2012.77    0.469   270.91
2013.77    0.466   273.11
2014.77    0.463   275.34
2015.77    0.459   277.60
2016.77    0.456   279.90
2017.77    0.452   282.24
2018.77    0.447   284.62
2019.77    0.443   287.05
2020.77    0.439   289.52
2021.77    0.434   292.05
2022.77    0.429   294.63
2023.77    0.424   297.28
2024.77    0.418   299.99
2025.77    0.413   302.77
2026.77    0.407   305.63
2027.77    0.402   308.57
2028.77    0.396   311.60
2029.77    0.390   314.71
2030.77    0.384   317.92
2031.77    0.378   321.23
2032.77    0.372   324.65
2033.77    0.366   328.18
2034.77    0.360   331.83
2035.77    0.354   335.61
2036.77    0.348   339.51
2037.77    0.342   343.54
2038.77    0.337   347.71
2039.77    0.331   352.02
2040.77    0.326   356.48
2041.77    0.321     1.08
2042.77    0.316     5.82
2043.77    0.311    10.71
2044.77    0.307    15.74
2045.77    0.303    20.91
2046.77    0.299    26.22
2047.77    0.296    31.65
2048.77    0.293    37.20
2049.77    0.290    42.86
2050.77    0.288    48.62
2051.77    0.286    54.46
2052.77    0.284    60.37
2053.77    0.283    66.34
2054.77    0.283    72.34
2055.77    0.283    78.35
2056.77    0.283    84.37
2057.77    0.284    90.35
2058.77    0.285    96.29
2059.77    0.287   102.16
2060.77    0.290   107.95
2061.77    0.293   113.62
2062.77    0.296   119.18
2063.77    0.300   124.60
2064.77    0.304   129.86
2065.77    0.309   134.97
2066.77    0.314   139.92
2067.77    0.320   144.70
2068.77    0.326   149.31
2069.77    0.332   153.75
2070.77    0.338   158.03
2071.77    0.345   162.15
2072.77    0.351   166.12
2073.77    0.358   169.94
2074.77    0.365   173.62
2075.77    0.372   177.16

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 17:24:53