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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 18:59:25

Orbital Elements for B398AB

WDS:	B398AB	WDS ID/Discoverer
P:	47.040	Orbital period (years)
a:	0.279	Semi-major axis (arcseconds)
i:	105.2	Inclination (degrees)
Ω:	166.8	Longitude of ascending node (degrees)
T:	2013.950	Epoch of periastron passage (year)
e:	0.124	Eccentricity
ω:	133.2	Longitude of periastron (degrees)
Start-Year:	2002.0	Year
End-Year:	2048.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for B398AB

Position:	184325.45-554600.8	Epoch-2000 right ascension and declination
WDS-ID:	18434-5546	WDS designation
Discoverer Code:	B398AB	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	172447	HD catalog number
Hipparcos number:	91837	Hipparcos catalog number
V1:	8.07	Magnitude of the primary
V2:	9.17	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2015	Date of last observation
Orbit grade:	3	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for B398AB

WDS 6th Orbit including measures of B398AB

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

Ephemeris of B398AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.182    328.3
-------------------------
2002.0     0.254    159.0
2003.0     0.232    156.3
2004.0     0.207    153.1
2005.0     0.179    149.0
2006.0     0.149    143.2
2007.0     0.118    134.4
2008.0     0.089    119.6
2009.0     0.069     93.7
2010.0     0.069     59.2
2011.0     0.088     32.7
2012.0     0.116     17.3
2013.0     0.146      8.2
2014.0     0.175      2.1
2015.0     0.201    357.7
2016.0     0.222    354.3
2017.0     0.238    351.4
2018.0     0.249    348.8
2019.0     0.254    346.3
2020.0     0.253    343.9
2021.0     0.248    341.4
2022.0     0.237    338.8
2023.0     0.222    335.9
2024.0     0.203    332.4
2025.0     0.182    328.3
2026.0     0.158    322.9
2027.0     0.134    315.6
2028.0     0.111    305.2
2029.0     0.091    289.8
2030.0     0.080    268.2
2031.0     0.082    243.8
2032.0     0.095    223.4
2033.0     0.116    209.1
2034.0     0.140    199.5
2035.0     0.165    192.8
2036.0     0.189    187.8
2037.0     0.213    183.9
2038.0     0.234    180.8
2039.0     0.253    178.2
2040.0     0.269    175.9
2041.0     0.283    173.9
2042.0     0.293    172.0
2043.0     0.299    170.3
2044.0     0.302    168.6
2045.0     0.300    166.8
2046.0     0.295    165.1
2047.0     0.286    163.3

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.