Content-Type: text/html; charset=UTF-8 Double Star Calculator - Orbital Elements

Double Star Calculator - Orbit

- Revision:   $Rev: 1216 $
- Report created:   2025-07-11 16:56:31

Orbital Elements for A998
WDS: A998 WDS ID/Discoverer
P: 158.245 Orbital period (years)
a: 0.2814 Semi-major axis (arcseconds)
i: 123.76 Inclination (degrees)
Ω: 170.76 Longitude of ascending node (degrees)
T: 2010.160 Epoch of periastron passage (year)
e: 0.6922 Eccentricity
ω: 46.91 Longitude of periastron (degrees)
Start-Year: 1946.0 Year
End-Year: 2104.0 Year
Epoch: 2025.0 Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for A998
Position: 040854.55+461340.2 Epoch-2000 right ascension and declination
WDS-ID: 04089+4614 WDS designation
Discoverer Code: A998 Discover designation and components
ADS number: 3007 Aitken Double Star catalog
HD number: 25987 HD catalog number
Hipparcos number: 19366 Hipparcos catalog number
V1: 7.87 Magnitude of the primary
V2: 8.50 Magnitude of the secondary
Equinox: 2000 Equinox
Date: 1989 Date of last observation
Orbit grade: 3 Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags: Flags

Double Star Orbit for A998



WDS 6th Orbit including measures of A998

Image from the USNO WDS 6th Orbit Catalog (see Acknowledgements)


Ephemeris of A998
Click to expand/collapse ephemeris: 
Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.214    359.0
-------------------------
1946.0     0.338    311.7
1947.0     0.334    311.0
1948.0     0.331    310.4
1949.0     0.327    309.7
1950.0     0.324    309.0
1951.0     0.320    308.3
1952.0     0.316    307.6
1953.0     0.312    306.9
1954.0     0.308    306.1
1955.0     0.304    305.4
1956.0     0.300    304.6
1957.0     0.296    303.7
1958.0     0.292    302.9
1959.0     0.288    302.1
1960.0     0.284    301.2
1961.0     0.279    300.3
1962.0     0.275    299.3
1963.0     0.271    298.3
1964.0     0.266    297.3
1965.0     0.262    296.3
1966.0     0.257    295.2
1967.0     0.252    294.1
1968.0     0.248    293.0
1969.0     0.243    291.8
1970.0     0.238    290.5
1971.0     0.234    289.2
1972.0     0.229    287.9
1973.0     0.224    286.5
1974.0     0.219    285.0
1975.0     0.215    283.5
1976.0     0.210    281.9
1977.0     0.205    280.2
1978.0     0.201    278.4
1979.0     0.196    276.6
1980.0     0.191    274.7
1981.0     0.187    272.6
1982.0     0.182    270.5
1983.0     0.178    268.3
1984.0     0.173    265.9
1985.0     0.169    263.5
1986.0     0.165    260.9
1987.0     0.161    258.1
1988.0     0.157    255.3
1989.0     0.153    252.3
1990.0     0.150    249.1
1991.0     0.146    245.8
1992.0     0.143    242.4
1993.0     0.140    238.8
1994.0     0.138    235.1
1995.0     0.135    231.2
1996.0     0.133    227.2
1997.0     0.131    223.0
1998.0     0.129    218.8
1999.0     0.127    214.4
2000.0     0.125    209.8
2001.0     0.124    205.2
2002.0     0.122    200.4
2003.0     0.119    195.4
2004.0     0.116    190.2
2005.0     0.112    184.7
2006.0     0.107    178.7
2007.0     0.101    172.1
2008.0     0.092    164.3
2009.0     0.082    154.9
2010.0     0.071    142.4
2011.0     0.060    125.3
2012.0     0.054    102.4
2013.0     0.055     77.2
2014.0     0.063     56.0
2015.0     0.076     40.9
2016.0     0.091     30.6
2017.0     0.107     23.2
2018.0     0.122     17.7
2019.0     0.137     13.4
2020.0     0.152      9.9
2021.0     0.166      7.0
2022.0     0.179      4.6
2023.0     0.191      2.5
2024.0     0.203      0.6
2025.0     0.214    359.0
2026.0     0.225    357.5
2027.0     0.235    356.1
2028.0     0.245    354.8
2029.0     0.254    353.7
2030.0     0.263    352.6
2031.0     0.271    351.6
2032.0     0.279    350.6
2033.0     0.287    349.7
2034.0     0.294    348.9
2035.0     0.301    348.1
2036.0     0.307    347.3
2037.0     0.314    346.5
2038.0     0.320    345.8
2039.0     0.325    345.1
2040.0     0.331    344.4
2041.0     0.336    343.8
2042.0     0.341    343.2
2043.0     0.345    342.5
2044.0     0.350    341.9
2045.0     0.354    341.4
2046.0     0.358    340.8
2047.0     0.361    340.2
2048.0     0.365    339.7
2049.0     0.368    339.1
2050.0     0.371    338.6
2051.0     0.374    338.1
2052.0     0.377    337.6
2053.0     0.380    337.1
2054.0     0.382    336.6
2055.0     0.384    336.1
2056.0     0.386    335.6
2057.0     0.388    335.1
2058.0     0.390    334.6
2059.0     0.391    334.2
2060.0     0.393    333.7
2061.0     0.394    333.2
2062.0     0.395    332.8
2063.0     0.396    332.3
2064.0     0.397    331.8
2065.0     0.398    331.4
2066.0     0.398    330.9
2067.0     0.399    330.5
2068.0     0.399    330.0
2069.0     0.399    329.6
2070.0     0.399    329.1
2071.0     0.399    328.7
2072.0     0.399    328.2
2073.0     0.399    327.8
2074.0     0.398    327.3
2075.0     0.398    326.8
2076.0     0.397    326.4
2077.0     0.396    325.9
2078.0     0.395    325.5
2079.0     0.394    325.0
2080.0     0.393    324.5
2081.0     0.392    324.1
2082.0     0.391    323.6
2083.0     0.389    323.1
2084.0     0.388    322.6
2085.0     0.386    322.2
2086.0     0.385    321.7
2087.0     0.383    321.2
2088.0     0.381    320.7
2089.0     0.379    320.2
2090.0     0.377    319.7
2091.0     0.375    319.2
2092.0     0.372    318.7
2093.0     0.370    318.1
2094.0     0.368    317.6
2095.0     0.365    317.1
2096.0     0.362    316.5
2097.0     0.360    316.0
2098.0     0.357    315.4
2099.0     0.354    314.8
2100.0     0.351    314.2
2101.0     0.348    313.7
2102.0     0.345    313.1
2103.0     0.342    312.4



 

Disclaimer
This result is provided without warranty. For all terms, see the Full Disclaimer. Copyright (C) 2025. The Double Star Calculator and the results generated are licensed under CC BY-NC-SA 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.


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