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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 18:19:07

Orbital Elements for I365AB

WDS:	I365AB	WDS ID/Discoverer
P:	35.000	Orbital period (years)
a:	0.45	Semi-major axis (arcseconds)
i:	117.0	Inclination (degrees)
Ω:	71.0	Longitude of ascending node (degrees)
T:	1967.500	Epoch of periastron passage (year)
e:	0.78	Eccentricity
ω:	94.0	Longitude of periastron (degrees)
Start-Year:	2008.0	Year
End-Year:	2042.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for I365AB

Position:	133712.20-614131.7	Epoch-2000 right ascension and declination
WDS-ID:	13372-6142	WDS designation
Discoverer Code:	I365AB	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	118261	HD catalog number
Hipparcos number:	66438	Hipparcos catalog number
V1:	5.98	Magnitude of the primary
V2:	7.22	Magnitude of the secondary
Equinox:	2000	Equinox
Date:		Date of last observation
Orbit grade:	2	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for I365AB

WDS 6th Orbit including measures of I365AB

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

Ephemeris of I365AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.383    131.2
-------------------------
2008.0     0.320    211.2
2009.0     0.329    205.6
2010.0     0.335    200.2
2011.0     0.339    195.0
2012.0     0.343    189.9
2013.0     0.346    184.9
2014.0     0.349    180.0
2015.0     0.352    175.2
2016.0     0.354    170.5
2017.0     0.357    165.8
2018.0     0.360    161.2
2019.0     0.364    156.7
2020.0     0.367    152.2
2021.0     0.370    147.9
2022.0     0.374    143.6
2023.0     0.377    139.4
2024.0     0.380    135.3
2025.0     0.383    131.2
2026.0     0.384    127.2
2027.0     0.385    123.2
2028.0     0.385    119.2
2029.0     0.382    115.2
2030.0     0.378    111.1
2031.0     0.371    106.9
2032.0     0.359    102.4
2033.0     0.342     97.6
2034.0     0.317     92.2
2035.0     0.279     85.6
2036.0     0.218     76.1
2037.0     0.104     52.1
2038.0     0.111    265.2
2039.0     0.212    242.1
2040.0     0.261    231.6
2041.0     0.290    223.8

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.