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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 19:17:07

Orbital Elements for HDS2977AB

WDS:	HDS2977AB	WDS ID/Discoverer
P:	67.800	Orbital period (years)
a:	0.227	Semi-major axis (arcseconds)
i:	111.7	Inclination (degrees)
Ω:	291.1	Longitude of ascending node (degrees)
T:	2018.440	Epoch of periastron passage (year)
e:	0.825	Eccentricity
ω:	225.6	Longitude of periastron (degrees)
Start-Year:	1992.0	Year
End-Year:	2058.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for HDS2977AB

Position:	205334.76-775018.6	Epoch-2000 right ascension and declination
WDS-ID:	20536-7750	WDS designation
Discoverer Code:	HDS2977AB	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	197767	HD catalog number
Hipparcos number:	103118	Hipparcos catalog number
V1:	10.19	Magnitude of the primary
V2:	10.31	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2021	Date of last observation
Orbit grade:	3	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:		Flags

Double Star Orbit for HDS2977AB

WDS 6th Orbit including measures of HDS2977AB

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

Ephemeris of HDS2977AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.199    288.8
-------------------------
1992.0     0.271    265.4
1993.0     0.264    264.6
1994.0     0.257    263.8
1995.0     0.249    262.9
1996.0     0.241    261.9
1997.0     0.233    260.9
1998.0     0.224    259.8
1999.0     0.215    258.6
2000.0     0.206    257.3
2001.0     0.196    255.9
2002.0     0.186    254.4
2003.0     0.176    252.6
2004.0     0.165    250.6
2005.0     0.154    248.4
2006.0     0.143    245.8
2007.0     0.131    242.7
2008.0     0.119    239.1
2009.0     0.108    234.6
2010.0     0.096    229.1
2011.0     0.085    222.1
2012.0     0.074    213.0
2013.0     0.065    201.2
2014.0     0.059    186.1
2015.0     0.055    168.4
2016.0     0.055    149.5
2017.0     0.055    130.8
2018.0     0.044    109.0
2019.0     0.018      9.2
2020.0     0.060    309.1
2021.0     0.099    299.6
2022.0     0.130    295.2
2023.0     0.157    292.5
2024.0     0.179    290.4
2025.0     0.199    288.8
2026.0     0.216    287.5
2027.0     0.231    286.3
2028.0     0.244    285.3
2029.0     0.256    284.4
2030.0     0.267    283.6
2031.0     0.276    282.8
2032.0     0.285    282.1
2033.0     0.292    281.4
2034.0     0.299    280.7
2035.0     0.304    280.1
2036.0     0.309    279.5
2037.0     0.314    278.9
2038.0     0.317    278.3
2039.0     0.320    277.8
2040.0     0.322    277.2
2041.0     0.324    276.7
2042.0     0.325    276.1
2043.0     0.326    275.6
2044.0     0.326    275.1
2045.0     0.326    274.5
2046.0     0.325    274.0
2047.0     0.324    273.4
2048.0     0.322    272.9
2049.0     0.320    272.3
2050.0     0.317    271.8
2051.0     0.314    271.2
2052.0     0.311    270.6
2053.0     0.307    270.0
2054.0     0.303    269.4
2055.0     0.298    268.8
2056.0     0.293    268.1
2057.0     0.288    267.4

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.