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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 18:32:19

Orbital Elements for HDS2191

WDS:	HDS2191	WDS ID/Discoverer
P:	62.520	Orbital period (years)
a:	0.302	Semi-major axis (arcseconds)
i:	88.6	Inclination (degrees)
Ω:	201.9	Longitude of ascending node (degrees)
T:	2005.250	Epoch of periastron passage (year)
e:	0.315	Eccentricity
ω:	267.1	Longitude of periastron (degrees)
Start-Year:	1994.0	Year
End-Year:	2056.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for HDS2191

Position:	153528.34-475056.7	Epoch-2000 right ascension and declination
WDS-ID:	15355-4751	WDS designation
Discoverer Code:	HDS2191	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	138676	HD catalog number
Hipparcos number:	76328	Hipparcos catalog number
V1:	9.41	Magnitude of the primary
V2:	10.06	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2014	Date of last observation
Orbit grade:	4	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:		Flags

Double Star Orbit for HDS2191

WDS 6th Orbit including measures of HDS2191

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

Ephemeris of HDS2191

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.240    203.5
-------------------------
1994.0     0.281     21.5
1995.0     0.277     21.7
1996.0     0.270     21.9
1997.0     0.259     22.0
1998.0     0.243     22.2
1999.0     0.224     22.5
2000.0     0.200     22.7
2001.0     0.171     23.1
2002.0     0.138     23.6
2003.0     0.102     24.5
2004.0     0.062     26.4
2005.0     0.022     35.4
2006.0     0.022    188.4
2007.0     0.063    197.4
2008.0     0.102    199.3
2009.0     0.139    200.2
2010.0     0.172    200.7
2011.0     0.201    201.0
2012.0     0.225    201.3
2013.0     0.246    201.5
2014.0     0.262    201.7
2015.0     0.275    201.9
2016.0     0.284    202.0
2017.0     0.289    202.2
2018.0     0.291    202.3
2019.0     0.291    202.5
2020.0     0.288    202.6
2021.0     0.282    202.8
2022.0     0.274    202.9
2023.0     0.265    203.1
2024.0     0.253    203.3
2025.0     0.240    203.5
2026.0     0.226    203.7
2027.0     0.210    204.0
2028.0     0.193    204.3
2029.0     0.175    204.6
2030.0     0.156    205.1
2031.0     0.137    205.6
2032.0     0.117    206.4
2033.0     0.096    207.5
2034.0     0.075    209.2
2035.0     0.054    212.2
2036.0     0.033    219.1
2037.0     0.013    247.9
2038.0     0.016    344.2
2039.0     0.036      6.3
2040.0     0.057     12.3
2041.0     0.078     15.0
2042.0     0.099     16.6
2043.0     0.120     17.6
2044.0     0.140     18.3
2045.0     0.159     18.9
2046.0     0.177     19.3
2047.0     0.195     19.7
2048.0     0.211     20.0
2049.0     0.226     20.2
2050.0     0.240     20.4
2051.0     0.252     20.6
2052.0     0.263     20.8
2053.0     0.271     21.0
2054.0     0.277     21.2
2055.0     0.281     21.3

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.