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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 19:01:35

Orbital Elements for BU648AB

WDS:	BU648AB	WDS ID/Discoverer
P:	63.249	Orbital period (years)
a:	1.24739	Semi-major axis (arcseconds)
i:	115.743	Inclination (degrees)
Ω:	49.397	Longitude of ascending node (degrees)
T:	1972.727	Epoch of periastron passage (year)
e:	0.21805	Eccentricity
ω:	288.164	Longitude of periastron (degrees)
Start-Year:	1994.0	Year
End-Year:	2056.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for BU648AB

Position:	185701.61+325404.6	Epoch-2000 right ascension and declination
WDS-ID:	18570+3254	WDS designation
Discoverer Code:	BU648AB	Discover designation and components
ADS number:	11871	Aitken Double Star catalog
HD number:	176051	HD catalog number
Hipparcos number:	93017	Hipparcos catalog number
V1:	5.34	Magnitude of the primary
V2:	7.96	Magnitude of the secondary
Equinox:		Equinox
Date:	2015	Date of last observation
Orbit grade:	2	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for BU648AB

WDS 6th Orbit including measures of BU648AB

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

Ephemeris of BU648AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     1.111    219.9
-------------------------
1994.0     0.787      2.8
1995.0     0.745    356.4
1996.0     0.708    349.3
1997.0     0.679    341.4
1998.0     0.659    333.0
1999.0     0.651    324.2
2000.0     0.654    315.4
2001.0     0.669    306.8
2002.0     0.694    298.7
2003.0     0.728    291.2
2004.0     0.770    284.5
2005.0     0.817    278.5
2006.0     0.867    273.2
2007.0     0.919    268.5
2008.0     0.971    264.3
2009.0     1.023    260.5
2010.0     1.073    257.1
2011.0     1.120    254.0
2012.0     1.164    251.1
2013.0     1.203    248.4
2014.0     1.237    245.9
2015.0     1.266    243.5
2016.0     1.288    241.2
2017.0     1.303    239.0
2018.0     1.311    236.8
2019.0     1.311    234.6
2020.0     1.301    232.4
2021.0     1.283    230.2
2022.0     1.255    227.8
2023.0     1.217    225.4
2024.0     1.169    222.7
2025.0     1.111    219.9
2026.0     1.043    216.6
2027.0     0.965    212.9
2028.0     0.880    208.5
2029.0     0.787    203.1
2030.0     0.692    196.2
2031.0     0.598    187.1
2032.0     0.514    174.8
2033.0     0.452    158.4
2034.0     0.427    138.7
2035.0     0.448    118.7
2036.0     0.506    102.0
2037.0     0.587     89.3
2038.0     0.678     79.9
2039.0     0.769     72.7
2040.0     0.855     67.0
2041.0     0.932     62.3
2042.0     0.998     58.3
2043.0     1.052     54.7
2044.0     1.092     51.4
2045.0     1.121     48.4
2046.0     1.137     45.4
2047.0     1.142     42.5
2048.0     1.136     39.6
2049.0     1.120     36.7
2050.0     1.097     33.6
2051.0     1.065     30.4
2052.0     1.028     27.0
2053.0     0.986     23.3
2054.0     0.941     19.3
2055.0     0.893     14.8

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.