Double Star Calculator - Orbit

Orbital Elements for A1777AB

WDS:	A1777AB	WDS ID/Discoverer
P:	118.209	Orbital period (years)
a:	0.2082	Semi-major axis (arcseconds)
i:	38.1	Inclination (degrees)
Ω:	2.1	Longitude of ascending node (degrees)
T:	1988.970	Epoch of periastron passage (year)
e:	0.504	Eccentricity
ω:	202.7	Longitude of periastron (degrees)
Start-Year:	1965.8955	Year
End-Year:	2084.1045	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for A1777AB
Position:	115505.74+462836.6	Epoch-2000 right ascension and declination
WDS-ID:	11551+4629	WDS designation
Discoverer Code:	A1777AB	Discover designation and components
ADS number:	8347	Aitken Double Star catalog
HD number:	103483	HD catalog number
Hipparcos number:	58112	Hipparcos catalog number
V1:	6.5	Magnitude of the primary
V2:	9.0	Magnitude of the secondary
Equinox:		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:	Zas2012b	Reference

Double Star Orbit for A1777AB

WDS 6th Orbit including measures of A1777AB

-- 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 A1777AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.282   358.80
--------------------------
1965.90    0.180    73.43
1966.90    0.175    76.28
1967.90    0.170    79.30
1968.90    0.165    82.51
1969.90    0.160    85.92
1970.90    0.155    89.54
1971.90    0.150    93.40
1972.90    0.146    97.50
1973.90    0.141   101.86
1974.90    0.137   106.49
1975.90    0.133   111.39
1976.90    0.130   116.58
1977.90    0.127   122.04
1978.90    0.124   127.77
1979.90    0.121   133.77
1980.90    0.119   140.02
1981.90    0.116   146.52
1982.90    0.114   153.25
1983.90    0.112   160.22
1984.90    0.110   167.45
1985.90    0.108   174.96
1986.90    0.106   182.79
1987.90    0.103   191.01
1988.90    0.100   199.66
1989.90    0.098   208.78
1990.90    0.096   218.37
1991.90    0.094   228.35
1992.90    0.094   238.54
1993.90    0.095   248.69
1994.90    0.097   258.54
1995.90    0.100   267.83
1996.90    0.105   276.38
1997.90    0.111   284.13
1998.90    0.117   291.08
1999.90    0.124   297.26
2000.90    0.131   302.77
2001.90    0.139   307.68
2002.90    0.147   312.07
2003.90    0.155   316.02
2004.90    0.162   319.59
2005.90    0.170   322.83
2006.90    0.178   325.80
2007.90    0.185   328.53
2008.90    0.192   331.05
2009.90    0.199   333.39
2010.90    0.206   335.58
2011.90    0.213   337.63
2012.90    0.219   339.55
2013.90    0.225   341.38
2014.90    0.231   343.10
2015.90    0.236   344.75
2016.90    0.242   346.32
2017.90    0.247   347.82
2018.90    0.252   349.26
2019.90    0.257   350.65
2020.90    0.261   351.99
2021.90    0.265   353.29
2022.90    0.269   354.54
2023.90    0.273   355.76
2024.90    0.277   356.95
2025.90    0.280   358.11
2026.90    0.283   359.24
2027.90    0.286     0.35
2028.90    0.289     1.44
2029.90    0.291     2.50
2030.90    0.294     3.55
2031.90    0.296     4.59
2032.90    0.298     5.61
2033.90    0.299     6.61
2034.90    0.301     7.61
2035.90    0.302     8.60
2036.90    0.303     9.58
2037.90    0.304    10.55
2038.90    0.305    11.51
2039.90    0.306    12.48
2040.90    0.306    13.44
2041.90    0.306    14.39
2042.90    0.306    15.35
2043.90    0.306    16.30
2044.90    0.306    17.26
2045.90    0.306    18.22
2046.90    0.305    19.18
2047.90    0.304    20.15
2048.90    0.303    21.12
2049.90    0.302    22.10
2050.90    0.301    23.08
2051.90    0.300    24.08
2052.90    0.298    25.08
2053.90    0.296    26.10
2054.90    0.294    27.13
2055.90    0.292    28.17
2056.90    0.290    29.23
2057.90    0.288    30.31
2058.90    0.285    31.40
2059.90    0.282    32.51
2060.90    0.280    33.65
2061.90    0.277    34.81
2062.90    0.274    35.99
2063.90    0.270    37.21
2064.90    0.267    38.45
2065.90    0.263    39.73
2066.90    0.260    41.04
2067.90    0.256    42.39
2068.90    0.252    43.78
2069.90    0.248    45.21
2070.90    0.244    46.69
2071.90    0.240    48.23
2072.90    0.235    49.82
2073.90    0.231    51.48
2074.90    0.226    53.20
2075.90    0.221    54.99
2076.90    0.217    56.86
2077.90    0.212    58.82
2078.90    0.207    60.87
2079.90    0.202    63.03
2080.90    0.197    65.29
2081.90    0.191    67.68
2082.90    0.186    70.19
2083.90    0.181    72.85

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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 16:42:34