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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 18:27:15

Orbital Elements for REU2

WDS:	REU2	WDS ID/Discoverer
P:	31.450	Orbital period (years)
a:	0.626	Semi-major axis (arcseconds)
i:	143.0	Inclination (degrees)
Ω:	303.0	Longitude of ascending node (degrees)
T:	1992.610	Epoch of periastron passage (year)
e:	0.839	Eccentricity
ω:	25.0	Longitude of periastron (degrees)
Start-Year:	2010.0	Year
End-Year:	2040.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for REU2

Position:	145351.40+233320.9	Epoch-2000 right ascension and declination
WDS-ID:	14540+2335	WDS designation
Discoverer Code:	REU2	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	.	HD catalog number
Hipparcos number:	72896	Hipparcos catalog number
V1:	12.24	Magnitude of the primary
V2:	12.66	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2014	Date of last observation
Orbit grade:	4	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for REU2

WDS 6th Orbit including measures of REU2

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

Ephemeris of REU2

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.225    163.5
-------------------------
2010.0     1.096     99.9
2011.0     1.077     98.3
2012.0     1.051     96.6
2013.0     1.020     94.7
2014.0     0.981     92.8
2015.0     0.935     90.7
2016.0     0.882     88.3
2017.0     0.820     85.6
2018.0     0.750     82.5
2019.0     0.670     78.6
2020.0     0.578     73.6
2021.0     0.474     66.5
2022.0     0.353     54.9
2023.0     0.218     29.7
2024.0     0.102    294.4
2025.0     0.225    163.5
2026.0     0.401    142.4
2027.0     0.540    133.5
2028.0     0.653    128.1
2029.0     0.747    124.1
2030.0     0.826    120.9
2031.0     0.893    118.3
2032.0     0.949    116.0
2033.0     0.996    113.9
2034.0     1.034    112.0
2035.0     1.064    110.3
2036.0     1.087    108.6
2037.0     1.103    107.0
2038.0     1.113    105.4
2039.0     1.116    103.8

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.