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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 19:02:35

Orbital Elements for I1391

WDS:	I1391	WDS ID/Discoverer
P:	47.380	Orbital period (years)
a:	0.178	Semi-major axis (arcseconds)
i:	35.8	Inclination (degrees)
Ω:	271.3	Longitude of ascending node (degrees)
T:	2006.140	Epoch of periastron passage (year)
e:	0.641	Eccentricity
ω:	56.4	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 I1391

Position:	190358.43-380402.0	Epoch-2000 right ascension and declination
WDS-ID:	19040-3804	WDS designation
Discoverer Code:	I1391	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	176891	HD catalog number
Hipparcos number:	93625	Hipparcos catalog number
V1:	9.91	Magnitude of the primary
V2:	9.71	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2014	Date of last observation
Orbit grade:	3	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:		Flags

Double Star Orbit for I1391

WDS 6th Orbit including measures of I1391

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

Ephemeris of I1391

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.257    131.1
-------------------------
2002.0     0.115    226.6
2003.0     0.103    239.3
2004.0     0.089    255.7
2005.0     0.073    278.9
2006.0     0.057    315.4
2007.0     0.056      5.3
2008.0     0.075     42.1
2009.0     0.099     62.5
2010.0     0.121     75.0
2011.0     0.142     83.7
2012.0     0.160     90.3
2013.0     0.175     95.7
2014.0     0.189    100.2
2015.0     0.201    104.1
2016.0     0.212    107.6
2017.0     0.221    110.8
2018.0     0.229    113.8
2019.0     0.236    116.5
2020.0     0.242    119.2
2021.0     0.246    121.7
2022.0     0.250    124.1
2023.0     0.253    126.5
2024.0     0.256    128.8
2025.0     0.257    131.1
2026.0     0.258    133.3
2027.0     0.258    135.6
2028.0     0.258    137.8
2029.0     0.257    140.1
2030.0     0.255    142.4
2031.0     0.252    144.7
2032.0     0.249    147.1
2033.0     0.246    149.5
2034.0     0.242    152.0
2035.0     0.237    154.7
2036.0     0.232    157.4
2037.0     0.226    160.2
2038.0     0.220    163.3
2039.0     0.213    166.4
2040.0     0.206    169.9
2041.0     0.198    173.5
2042.0     0.190    177.5
2043.0     0.181    181.8
2044.0     0.172    186.6
2045.0     0.163    192.0
2046.0     0.153    198.0
2047.0     0.142    204.9

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.