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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 18:54:41

Orbital Elements for AC15AB

WDS:	AC15AB	WDS ID/Discoverer
P:	55.910	Orbital period (years)
a:	1.05	Semi-major axis (arcseconds)
i:	36.18	Inclination (degrees)
Ω:	223.62	Longitude of ascending node (degrees)
T:	1997.800	Epoch of periastron passage (year)
e:	0.761	Eccentricity
ω:	295.38	Longitude of periastron (degrees)
Start-Year:	1998.0	Year
End-Year:	2052.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for AC15AB

Position:	180701.61+303342.7	Epoch-2000 right ascension and declination
WDS-ID:	18070+3034	WDS designation
Discoverer Code:	AC15AB	Discover designation and components
ADS number:	11077	Aitken Double Star catalog
HD number:	165908	HD catalog number
Hipparcos number:	88745	Hipparcos catalog number
V1:	5.13	Magnitude of the primary
V2:	8.96	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2011	Date of last observation
Orbit grade:	2	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for AC15AB

WDS 6th Orbit including measures of AC15AB

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

Ephemeris of AC15AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     1.558    342.9
-------------------------
1998.0     0.227    179.6
1999.0     0.348    227.4
2000.0     0.460    250.4
2001.0     0.557    264.9
2002.0     0.643    275.2
2003.0     0.722    283.2
2004.0     0.794    289.7
2005.0     0.862    295.1
2006.0     0.926    299.8
2007.0     0.985    303.9
2008.0     1.041    307.5
2009.0     1.094    310.8
2010.0     1.143    313.7
2011.0     1.190    316.5
2012.0     1.233    319.0
2013.0     1.273    321.4
2014.0     1.311    323.6
2015.0     1.346    325.7
2016.0     1.379    327.7
2017.0     1.409    329.6
2018.0     1.436    331.4
2019.0     1.461    333.2
2020.0     1.483    334.9
2021.0     1.503    336.6
2022.0     1.521    338.2
2023.0     1.536    339.8
2024.0     1.548    341.4
2025.0     1.558    342.9
2026.0     1.566    344.4
2027.0     1.571    345.9
2028.0     1.573    347.5
2029.0     1.573    349.0
2030.0     1.570    350.5
2031.0     1.565    352.0
2032.0     1.557    353.5
2033.0     1.545    355.0
2034.0     1.531    356.6
2035.0     1.514    358.2
2036.0     1.493    359.9
2037.0     1.469      1.6
2038.0     1.442      3.3
2039.0     1.411      5.1
2040.0     1.375      7.0
2041.0     1.336      9.1
2042.0     1.291     11.2
2043.0     1.242     13.5
2044.0     1.187     16.1
2045.0     1.125     18.8
2046.0     1.057     22.0
2047.0     0.980     25.6
2048.0     0.893     29.8
2049.0     0.795     35.0
2050.0     0.682     41.8
2051.0     0.551     51.7

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.