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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 19:09:07

Orbital Elements for I120AB

WDS:	I120AB	WDS ID/Discoverer
P:	64.090	Orbital period (years)
a:	0.324	Semi-major axis (arcseconds)
i:	141.2	Inclination (degrees)
Ω:	118.7	Longitude of ascending node (degrees)
T:	1996.490	Epoch of periastron passage (year)
e:	0.687	Eccentricity
ω:	139.5	Longitude of periastron (degrees)
Start-Year:	1993.0	Year
End-Year:	2057.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for I120AB

Position:	194907.25-614853.2	Epoch-2000 right ascension and declination
WDS-ID:	19491-6149	WDS designation
Discoverer Code:	I120AB	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	186602	HD catalog number
Hipparcos number:	97508	Hipparcos catalog number
V1:	8.31	Magnitude of the primary
V2:	8.02	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2017	Date of last observation
Orbit grade:	2	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for I120AB

WDS 6th Orbit including measures of I120AB

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

Ephemeris of I120AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.485    157.2
-------------------------
1993.0     0.161     80.3
1994.0     0.125     63.6
1995.0     0.096     35.1
1996.0     0.087    352.8
1997.0     0.102    314.2
1998.0     0.121    287.3
1999.0     0.139    267.4
2000.0     0.156    252.0
2001.0     0.173    239.5
2002.0     0.190    229.3
2003.0     0.208    220.9
2004.0     0.226    213.8
2005.0     0.244    207.7
2006.0     0.261    202.5
2007.0     0.279    197.9
2008.0     0.295    193.8
2009.0     0.312    190.2
2010.0     0.327    186.9
2011.0     0.342    184.0
2012.0     0.357    181.2
2013.0     0.371    178.7
2014.0     0.384    176.4
2015.0     0.396    174.2
2016.0     0.408    172.1
2017.0     0.419    170.2
2018.0     0.430    168.3
2019.0     0.440    166.5
2020.0     0.449    164.8
2021.0     0.457    163.2
2022.0     0.465    161.6
2023.0     0.472    160.1
2024.0     0.479    158.7
2025.0     0.485    157.2
2026.0     0.490    155.8
2027.0     0.494    154.4
2028.0     0.498    153.1
2029.0     0.501    151.7
2030.0     0.503    150.4
2031.0     0.504    149.1
2032.0     0.505    147.8
2033.0     0.505    146.5
2034.0     0.504    145.2
2035.0     0.502    143.8
2036.0     0.500    142.5
2037.0     0.496    141.2
2038.0     0.492    139.8
2039.0     0.487    138.4
2040.0     0.481    137.0
2041.0     0.474    135.5
2042.0     0.466    134.0
2043.0     0.457    132.4
2044.0     0.446    130.8
2045.0     0.435    129.1
2046.0     0.422    127.2
2047.0     0.408    125.3
2048.0     0.392    123.2
2049.0     0.375    121.0
2050.0     0.356    118.5
2051.0     0.336    115.7
2052.0     0.313    112.5
2053.0     0.288    108.8
2054.0     0.261    104.4
2055.0     0.231     98.9
2056.0     0.199     91.6

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.