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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 19:29:00

Orbital Elements for HO166

WDS:	HO166	WDS ID/Discoverer
P:	79.290	Orbital period (years)
a:	0.286	Semi-major axis (arcseconds)
i:	146.2	Inclination (degrees)
Ω:	87.1	Longitude of ascending node (degrees)
T:	2013.410	Epoch of periastron passage (year)
e:	0.279	Eccentricity
ω:	154.7	Longitude of periastron (degrees)
Start-Year:	1986.0	Year
End-Year:	2064.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for HO166

Position:	214354.25+275048.8	Epoch-2000 right ascension and declination
WDS-ID:	21439+2751	WDS designation
Discoverer Code:	HO166	Discover designation and components
ADS number:	15267	Aitken Double Star catalog
HD number:	206792	HD catalog number
Hipparcos number:	107288	Hipparcos catalog number
V1:	8.36	Magnitude of the primary
V2:	8.25	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2009	Date of last observation
Orbit grade:	2	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for HO166

WDS 6th Orbit including measures of HO166

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

Ephemeris of HO166

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.225    214.1
-------------------------
1986.0     0.342     79.8
1987.0     0.337     77.2
1988.0     0.332     74.6
1989.0     0.326     71.8
1990.0     0.319     69.0
1991.0     0.312     66.0
1992.0     0.305     62.9
1993.0     0.297     59.6
1994.0     0.288     56.2
1995.0     0.279     52.5
1996.0     0.270     48.6
1997.0     0.261     44.4
1998.0     0.252     39.9
1999.0     0.242     35.0
2000.0     0.233     29.7
2001.0     0.224     24.0
2002.0     0.215     17.9
2003.0     0.208     11.3
2004.0     0.201      4.2
2005.0     0.196    356.6
2006.0     0.191    348.7
2007.0     0.189    340.5
2008.0     0.188    332.1
2009.0     0.188    323.7
2010.0     0.189    315.3
2011.0     0.192    307.2
2012.0     0.195    299.2
2013.0     0.199    291.6
2014.0     0.202    284.2
2015.0     0.206    277.1
2016.0     0.209    270.3
2017.0     0.212    263.6
2018.0     0.214    257.1
2019.0     0.216    250.7
2020.0     0.218    244.4
2021.0     0.219    238.2
2022.0     0.221    232.1
2023.0     0.222    226.0
2024.0     0.223    220.0
2025.0     0.225    214.1
2026.0     0.227    208.4
2027.0     0.230    202.7
2028.0     0.233    197.1
2029.0     0.236    191.7
2030.0     0.240    186.5
2031.0     0.245    181.5
2032.0     0.249    176.6
2033.0     0.254    171.9
2034.0     0.260    167.5
2035.0     0.266    163.2
2036.0     0.272    159.1
2037.0     0.278    155.1
2038.0     0.284    151.4
2039.0     0.290    147.8
2040.0     0.296    144.3
2041.0     0.302    141.0
2042.0     0.308    137.8
2043.0     0.314    134.8
2044.0     0.320    131.8
2045.0     0.325    129.0
2046.0     0.330    126.2
2047.0     0.335    123.5
2048.0     0.339    120.9
2049.0     0.343    118.4
2050.0     0.347    115.9
2051.0     0.350    113.4
2052.0     0.353    111.0
2053.0     0.355    108.7
2054.0     0.357    106.3
2055.0     0.358    104.0
2056.0     0.359    101.7
2057.0     0.360     99.4
2058.0     0.360     97.1
2059.0     0.359     94.8
2060.0     0.358     92.5
2061.0     0.356     90.2
2062.0     0.354     87.9
2063.0     0.351     85.5

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.