Double Star Calculator - Orbit

Orbital Elements for A1391

WDS:	A1391	WDS ID/Discoverer
P:	138.120	Orbital period (years)
a:	0.238	Semi-major axis (arcseconds)
i:	44.9	Inclination (degrees)
Ω:	64.4	Longitude of ascending node (degrees)
T:	1981.135	Epoch of periastron passage (year)
e:	0.401	Eccentricity
ω:	177.4	Longitude of periastron (degrees)
Start-Year:	1955.94	Year
End-Year:	2094.06	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for A1391
Position:	191036.61+542835.1	Epoch-2000 right ascension and declination
WDS-ID:	19106+5429	WDS designation
Discoverer Code:	A1391	Discover designation and components
ADS number:	12144	Aitken Double Star catalog
HD number:	234826	HD catalog number
Hipparcos number:	94194	Hipparcos catalog number
V1:	9.17	Magnitude of the primary
V2:	10.05	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:	Pru2014	Reference

Double Star Orbit for A1391

WDS 6th Orbit including measures of A1391

-- 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 A1391

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.281    39.54
--------------------------
1955.94    0.181   121.06
1956.94    0.175   124.07
1957.94    0.170   127.29
1958.94    0.164   130.73
1959.94    0.159   134.41
1960.94    0.154   138.33
1961.94    0.149   142.51
1962.94    0.145   146.94
1963.94    0.141   151.64
1964.94    0.138   156.59
1965.94    0.135   161.76
1966.94    0.132   167.14
1967.94    0.131   172.67
1968.94    0.130   178.32
1969.94    0.129   184.02
1970.94    0.130   189.74
1971.94    0.130   195.42
1972.94    0.131   201.02
1973.94    0.133   206.52
1974.94    0.134   211.89
1975.94    0.136   217.12
1976.94    0.138   222.23
1977.94    0.139   227.21
1978.94    0.141   232.09
1979.94    0.142   236.89
1980.94    0.142   241.64
1981.94    0.143   246.35
1982.94    0.143   251.06
1983.94    0.142   255.79
1984.94    0.141   260.57
1985.94    0.140   265.42
1986.94    0.139   270.36
1987.94    0.137   275.38
1988.94    0.136   280.51
1989.94    0.135   285.73
1990.94    0.134   291.04
1991.94    0.133   296.41
1992.94    0.133   301.81
1993.94    0.133   307.20
1994.94    0.134   312.55
1995.94    0.136   317.81
1996.94    0.138   322.95
1997.94    0.140   327.93
1998.94    0.143   332.72
1999.94    0.146   337.31
2000.94    0.150   341.67
2001.94    0.154   345.80
2002.94    0.159   349.70
2003.94    0.164   353.39
2004.94    0.169   356.85
2005.94    0.174     0.11
2006.94    0.180     3.17
2007.94    0.185     6.06
2008.94    0.191     8.77
2009.94    0.196    11.33
2010.94    0.202    13.75
2011.94    0.208    16.03
2012.94    0.213    18.19
2013.94    0.219    20.24
2014.94    0.225    22.19
2015.94    0.230    24.04
2016.94    0.235    25.81
2017.94    0.241    27.50
2018.94    0.246    29.12
2019.94    0.251    30.67
2020.94    0.256    32.16
2021.94    0.261    33.59
2022.94    0.266    34.98
2023.94    0.270    36.31
2024.94    0.275    37.60
2025.94    0.279    38.85
2026.94    0.283    40.06
2027.94    0.287    41.24
2028.94    0.291    42.39
2029.94    0.295    43.51
2030.94    0.298    44.60
2031.94    0.302    45.66
2032.94    0.305    46.71
2033.94    0.308    47.73
2034.94    0.311    48.73
2035.94    0.313    49.71
2036.94    0.316    50.68
2037.94    0.318    51.63
2038.94    0.320    52.57
2039.94    0.322    53.50
2040.94    0.324    54.42
2041.94    0.326    55.32
2042.94    0.328    56.22
2043.94    0.329    57.11
2044.94    0.330    57.99
2045.94    0.331    58.87
2046.94    0.332    59.74
2047.94    0.332    60.61
2048.94    0.333    61.47
2049.94    0.333    62.34
2050.94    0.333    63.20
2051.94    0.333    64.06
2052.94    0.333    64.93
2053.94    0.333    65.79
2054.94    0.332    66.66
2055.94    0.331    67.53
2056.94    0.330    68.40
2057.94    0.329    69.28
2058.94    0.328    70.17
2059.94    0.326    71.07
2060.94    0.325    71.97
2061.94    0.323    72.88
2062.94    0.321    73.81
2063.94    0.319    74.74
2064.94    0.317    75.69
2065.94    0.314    76.66
2066.94    0.311    77.64
2067.94    0.308    78.63
2068.94    0.305    79.65
2069.94    0.302    80.69
2070.94    0.299    81.75
2071.94    0.295    82.84
2072.94    0.291    83.95
2073.94    0.288    85.09
2074.94    0.284    86.27
2075.94    0.279    87.48
2076.94    0.275    88.72
2077.94    0.270    90.01
2078.94    0.266    91.35
2079.94    0.261    92.73
2080.94    0.256    94.16
2081.94    0.251    95.66
2082.94    0.245    97.21
2083.94    0.240    98.84
2084.94    0.235   100.54
2085.94    0.229   102.33
2086.94    0.223   104.20
2087.94    0.217   106.17
2088.94    0.212   108.26
2089.94    0.206   110.46
2090.94    0.200   112.79
2091.94    0.194   115.27
2092.94    0.188   117.90
2093.94    0.182   120.71

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 18:01:12