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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 18:47:30

Orbital Elements for MLR571

WDS:	MLR571	WDS ID/Discoverer
P:	71.150	Orbital period (years)
a:	0.128	Semi-major axis (arcseconds)
i:	144.1	Inclination (degrees)
Ω:	203.1	Longitude of ascending node (degrees)
T:	2007.050	Epoch of periastron passage (year)
e:	0.374	Eccentricity
ω:	0.7	Longitude of periastron (degrees)
Start-Year:	1990.0	Year
End-Year:	2060.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for MLR571

Position:	173331.60+573331.4	Epoch-2000 right ascension and declination
WDS-ID:	17335+5734	WDS designation
Discoverer Code:	MLR571	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	159870	HD catalog number
Hipparcos number:	85923	Hipparcos catalog number
V1:	7.23	Magnitude of the primary
V2:	6.87	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2009	Date of last observation
Orbit grade:	3	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for MLR571

WDS 6th Orbit including measures of MLR571

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

Ephemeris of MLR571

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.130     66.3
-------------------------
1990.0     0.125    335.0
1991.0     0.120    330.9
1992.0     0.115    326.3
1993.0     0.110    321.4
1994.0     0.105    316.0
1995.0     0.100    310.0
1996.0     0.095    303.5
1997.0     0.091    296.3
1998.0     0.088    288.5
1999.0     0.085    280.1
2000.0     0.082    271.1
2001.0     0.081    261.7
2002.0     0.080    252.0
2003.0     0.079    242.1
2004.0     0.080    232.3
2005.0     0.080    222.5
2006.0     0.080    212.7
2007.0     0.080    203.0
2008.0     0.080    193.3
2009.0     0.080    183.5
2010.0     0.079    173.6
2011.0     0.079    163.7
2012.0     0.079    153.7
2013.0     0.080    143.9
2014.0     0.082    134.4
2015.0     0.084    125.3
2016.0     0.087    116.8
2017.0     0.091    108.9
2018.0     0.095    101.7
2019.0     0.100     95.1
2020.0     0.105     89.2
2021.0     0.110     83.7
2022.0     0.115     78.8
2023.0     0.120     74.3
2024.0     0.125     70.1
2025.0     0.130     66.3
2026.0     0.135     62.7
2027.0     0.139     59.4
2028.0     0.144     56.3
2029.0     0.148     53.4
2030.0     0.152     50.6
2031.0     0.155     48.0
2032.0     0.159     45.4
2033.0     0.162     43.0
2034.0     0.165     40.7
2035.0     0.167     38.4
2036.0     0.169     36.2
2037.0     0.171     34.1
2038.0     0.173     32.0
2039.0     0.174     29.9
2040.0     0.175     27.8
2041.0     0.176     25.8
2042.0     0.176     23.8
2043.0     0.176     21.8
2044.0     0.176     19.8
2045.0     0.175     17.7
2046.0     0.174     15.7
2047.0     0.173     13.6
2048.0     0.171     11.5
2049.0     0.169      9.4
2050.0     0.167      7.2
2051.0     0.165      4.9
2052.0     0.162      2.6
2053.0     0.159      0.2
2054.0     0.156    357.6
2055.0     0.152    355.0
2056.0     0.148    352.2
2057.0     0.144    349.3
2058.0     0.140    346.2
2059.0     0.135    343.0

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.