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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 16:24:48

Orbital Elements for STF80A

WDS:	STF80A	WDS ID/Discoverer
P:	80.920	Orbital period (years)
a:	0.278	Semi-major axis (arcseconds)
i:	70.13	Inclination (degrees)
Ω:	4.39	Longitude of ascending node (degrees)
T:	1872.390	Epoch of periastron passage (year)
e:	0.254	Eccentricity
ω:	272.7	Longitude of periastron (degrees)
Start-Year:	1985.0	Year
End-Year:	2065.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for STF80A

Position:	005923.33+004644.5	Epoch-2000 right ascension and declination
WDS-ID:	00594+0047	WDS designation
Discoverer Code:	STF80A	Discover designation and components
ADS number:	818	Aitken Double Star catalog
HD number:	5780	HD catalog number
Hipparcos number:	4624	Hipparcos catalog number
V1:	7.65	Magnitude of the primary
V2:	.	Magnitude of the secondary
Equinox:	1900	Equinox
Date:	1968	Date of last observation
Orbit grade:	9	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for STF80A

WDS 6th Orbit including measures of STF80A

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

Ephemeris of STF80A

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.212    194.4
-------------------------
1985.0     0.165     44.8
1986.0     0.155     49.2
1987.0     0.147     54.1
1988.0     0.138     59.7
1989.0     0.131     66.0
1990.0     0.126     72.8
1991.0     0.121     80.2
1992.0     0.119     88.1
1993.0     0.119     96.1
1994.0     0.120    104.1
1995.0     0.123    111.8
1996.0     0.128    118.9
1997.0     0.135    125.4
1998.0     0.143    131.3
1999.0     0.151    136.6
2000.0     0.160    141.2
2001.0     0.170    145.4
2002.0     0.180    149.1
2003.0     0.190    152.4
2004.0     0.200    155.4
2005.0     0.209    158.1
2006.0     0.219    160.5
2007.0     0.228    162.8
2008.0     0.236    164.9
2009.0     0.244    166.8
2010.0     0.251    168.7
2011.0     0.257    170.4
2012.0     0.263    172.1
2013.0     0.267    173.7
2014.0     0.270    175.3
2015.0     0.273    176.8
2016.0     0.273    178.3
2017.0     0.273    179.8
2018.0     0.271    181.4
2019.0     0.268    182.9
2020.0     0.263    184.5
2021.0     0.256    186.2
2022.0     0.248    188.0
2023.0     0.238    189.9
2024.0     0.226    192.0
2025.0     0.212    194.4
2026.0     0.197    197.1
2027.0     0.180    200.3
2028.0     0.161    204.2
2029.0     0.142    209.1
2030.0     0.122    215.6
2031.0     0.103    224.5
2032.0     0.086    237.2
2033.0     0.074    255.1
2034.0     0.071    277.1
2035.0     0.076    298.5
2036.0     0.090    315.2
2037.0     0.107    326.9
2038.0     0.127    335.2
2039.0     0.146    341.3
2040.0     0.165    346.0
2041.0     0.183    349.7
2042.0     0.199    352.8
2043.0     0.214    355.5
2044.0     0.227    357.8
2045.0     0.238    359.9
2046.0     0.247      1.8
2047.0     0.254      3.6
2048.0     0.260      5.3
2049.0     0.264      7.0
2050.0     0.266      8.6
2051.0     0.267     10.2
2052.0     0.266     11.8
2053.0     0.264     13.4
2054.0     0.261     15.0
2055.0     0.257     16.7
2056.0     0.251     18.5
2057.0     0.245     20.3
2058.0     0.238     22.2
2059.0     0.230     24.3
2060.0     0.221     26.5
2061.0     0.213     28.9
2062.0     0.203     31.5
2063.0     0.193     34.4
2064.0     0.184     37.6

Disclaimer

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.