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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 18:35:37

Orbital Elements for STF1998AB

WDS:	STF1998AB	WDS ID/Discoverer
P:	45.900	Orbital period (years)
a:	0.654	Semi-major axis (arcseconds)
i:	34.5	Inclination (degrees)
Ω:	25.3	Longitude of ascending node (degrees)
T:	1997.220	Epoch of periastron passage (year)
e:	0.744	Eccentricity
ω:	163.8	Longitude of periastron (degrees)
Start-Year:	2003.0	Year
End-Year:	2047.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for STF1998AB

Position:	160422.13-112223.2	Epoch-2000 right ascension and declination
WDS-ID:	16044-1122	WDS designation
Discoverer Code:	STF1998AB	Discover designation and components
ADS number:	9909	Aitken Double Star catalog
HD number:	144069J	HD catalog number
Hipparcos number:	78727	Hipparcos catalog number
V1:	5.16	Magnitude of the primary
V2:	4.87	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2006	Date of last observation
Orbit grade:	1	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for STF1998AB

WDS 6th Orbit including measures of STF1998AB

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

Ephemeris of STF1998AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     1.102     18.9
-------------------------
2003.0     0.555    330.8
2004.0     0.622    336.2
2005.0     0.684    340.5
2006.0     0.741    344.1
2007.0     0.793    347.3
2008.0     0.841    350.0
2009.0     0.885    352.5
2010.0     0.924    354.8
2011.0     0.960    356.9
2012.0     0.992    358.8
2013.0     1.021      0.6
2014.0     1.046      2.3
2015.0     1.067      4.0
2016.0     1.086      5.6
2017.0     1.100      7.1
2018.0     1.112      8.6
2019.0     1.121     10.1
2020.0     1.126     11.6
2021.0     1.128     13.0
2022.0     1.126     14.5
2023.0     1.122     16.0
2024.0     1.114     17.4
2025.0     1.102     18.9
2026.0     1.087     20.5
2027.0     1.069     22.1
2028.0     1.046     23.7
2029.0     1.020     25.5
2030.0     0.990     27.3
2031.0     0.955     29.2
2032.0     0.916     31.3
2033.0     0.873     33.6
2034.0     0.823     36.2
2035.0     0.769     39.1
2036.0     0.708     42.5
2037.0     0.640     46.6
2038.0     0.564     51.7
2039.0     0.480     58.5
2040.0     0.386     68.4
2041.0     0.286     85.2
2042.0     0.193    119.4
2043.0     0.163    183.6
2044.0     0.195    243.2
2045.0     0.257    280.8
2046.0     0.334    302.3

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.