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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 18:59:09

Orbital Elements for A2988

WDS:	A2988	WDS ID/Discoverer
P:	57.172	Orbital period (years)
a:	0.102	Semi-major axis (arcseconds)
i:	154.7	Inclination (degrees)
Ω:	329.6	Longitude of ascending node (degrees)
T:	1941.464	Epoch of periastron passage (year)
e:	0.688	Eccentricity
ω:	306.8	Longitude of periastron (degrees)
Start-Year:	1997.0	Year
End-Year:	2053.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for A2988

Position:	184059.63+244930.3	Epoch-2000 right ascension and declination
WDS-ID:	18410+2450	WDS designation
Discoverer Code:	A2988	Discover designation and components
ADS number:	11574	Aitken Double Star catalog
HD number:	172743	HD catalog number
Hipparcos number:	91609	Hipparcos catalog number
V1:	8.08	Magnitude of the primary
V2:	9.08	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	1995	Date of last observation
Orbit grade:	3	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:		Flags

Double Star Orbit for A2988

WDS 6th Orbit including measures of A2988

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

Ephemeris of A2988

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.160    203.7
-------------------------
1997.0     0.038     89.1
1998.0     0.030     50.8
1999.0     0.031      3.2
2000.0     0.039    327.2
2001.0     0.048    303.9
2002.0     0.056    287.9
2003.0     0.065    276.2
2004.0     0.073    267.2
2005.0     0.081    259.9
2006.0     0.088    253.9
2007.0     0.095    248.7
2008.0     0.101    244.2
2009.0     0.107    240.3
2010.0     0.113    236.7
2011.0     0.118    233.5
2012.0     0.123    230.5
2013.0     0.128    227.8
2014.0     0.132    225.2
2015.0     0.136    222.8
2016.0     0.140    220.6
2017.0     0.143    218.4
2018.0     0.146    216.4
2019.0     0.149    214.4
2020.0     0.151    212.5
2021.0     0.154    210.6
2022.0     0.156    208.8
2023.0     0.157    207.1
2024.0     0.159    205.4
2025.0     0.160    203.7
2026.0     0.161    202.0
2027.0     0.162    200.4
2028.0     0.162    198.7
2029.0     0.162    197.1
2030.0     0.162    195.4
2031.0     0.162    193.8
2032.0     0.161    192.1
2033.0     0.160    190.5
2034.0     0.158    188.8
2035.0     0.157    187.0
2036.0     0.155    185.3
2037.0     0.152    183.5
2038.0     0.150    181.6
2039.0     0.147    179.6
2040.0     0.143    177.6
2041.0     0.140    175.4
2042.0     0.136    173.2
2043.0     0.131    170.7
2044.0     0.126    168.1
2045.0     0.120    165.3
2046.0     0.114    162.2
2047.0     0.108    158.7
2048.0     0.100    154.7
2049.0     0.092    150.0
2050.0     0.083    144.4
2051.0     0.074    137.4
2052.0     0.063    128.2

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.