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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 19:09:53

Orbital Elements for HU687

WDS:	HU687	WDS ID/Discoverer
P:	154.600	Orbital period (years)
a:	0.159	Semi-major axis (arcseconds)
i:	36.2	Inclination (degrees)
Ω:	28.9	Longitude of ascending node (degrees)
T:	1960.630	Epoch of periastron passage (year)
e:	0.321	Eccentricity
ω:	218.9	Longitude of periastron (degrees)
Start-Year:	1948.0	Year
End-Year:	2102.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for HU687

Position:	195456.19+504911.9	Epoch-2000 right ascension and declination
WDS-ID:	19549+5049	WDS designation
Discoverer Code:	HU687	Discover designation and components
ADS number:	13135	Aitken Double Star catalog
HD number:	188871	HD catalog number
Hipparcos number:	97997	Hipparcos catalog number
V1:	8.54	Magnitude of the primary
V2:	8.63	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2008	Date of last observation
Orbit grade:	3	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for HU687

WDS 6th Orbit including measures of HU687

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

Ephemeris of HU687

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.201     47.3
-------------------------
1948.0     0.119    195.1
1949.0     0.118    198.3
1950.0     0.117    201.5
1951.0     0.116    204.9
1952.0     0.114    208.3
1953.0     0.113    211.7
1954.0     0.111    215.3
1955.0     0.110    219.0
1956.0     0.108    222.8
1957.0     0.107    226.7
1958.0     0.105    230.7
1959.0     0.103    234.9
1960.0     0.101    239.2
1961.0     0.100    243.6
1962.0     0.098    248.2
1963.0     0.097    253.0
1964.0     0.095    257.9
1965.0     0.094    262.9
1966.0     0.094    268.0
1967.0     0.093    273.1
1968.0     0.093    278.3
1969.0     0.093    283.5
1970.0     0.094    288.7
1971.0     0.095    293.8
1972.0     0.096    298.7
1973.0     0.097    303.6
1974.0     0.099    308.2
1975.0     0.101    312.7
1976.0     0.104    317.0
1977.0     0.106    321.1
1978.0     0.109    325.0
1979.0     0.112    328.7
1980.0     0.115    332.2
1981.0     0.118    335.6
1982.0     0.121    338.7
1983.0     0.124    341.7
1984.0     0.127    344.6
1985.0     0.131    347.3
1986.0     0.134    349.8
1987.0     0.137    352.3
1988.0     0.140    354.6
1989.0     0.144    356.9
1990.0     0.147    359.0
1991.0     0.150      1.0
1992.0     0.153      3.0
1993.0     0.156      4.9
1994.0     0.158      6.7
1995.0     0.161      8.5
1996.0     0.164     10.2
1997.0     0.166     11.8
1998.0     0.169     13.4
1999.0     0.171     15.0
2000.0     0.174     16.5
2001.0     0.176     18.0
2002.0     0.178     19.4
2003.0     0.180     20.8
2004.0     0.182     22.2
2005.0     0.184     23.6
2006.0     0.185     24.9
2007.0     0.187     26.2
2008.0     0.188     27.5
2009.0     0.190     28.7
2010.0     0.191     30.0
2011.0     0.192     31.2
2012.0     0.194     32.4
2013.0     0.195     33.6
2014.0     0.196     34.8
2015.0     0.197     35.9
2016.0     0.197     37.1
2017.0     0.198     38.2
2018.0     0.199     39.4
2019.0     0.199     40.5
2020.0     0.200     41.6
2021.0     0.200     42.8
2022.0     0.200     43.9
2023.0     0.201     45.0
2024.0     0.201     46.1
2025.0     0.201     47.3
2026.0     0.201     48.4
2027.0     0.201     49.5
2028.0     0.200     50.6
2029.0     0.200     51.7
2030.0     0.200     52.8
2031.0     0.200     54.0
2032.0     0.199     55.1
2033.0     0.199     56.2
2034.0     0.198     57.4
2035.0     0.197     58.5
2036.0     0.197     59.7
2037.0     0.196     60.9
2038.0     0.195     62.1
2039.0     0.194     63.2
2040.0     0.193     64.4
2041.0     0.192     65.7
2042.0     0.191     66.9
2043.0     0.190     68.1
2044.0     0.189     69.4
2045.0     0.188     70.6
2046.0     0.187     71.9
2047.0     0.185     73.2
2048.0     0.184     74.5
2049.0     0.183     75.9
2050.0     0.181     77.2
2051.0     0.180     78.6
2052.0     0.178     80.0
2053.0     0.177     81.5
2054.0     0.175     82.9
2055.0     0.174     84.4
2056.0     0.172     85.9
2057.0     0.171     87.4
2058.0     0.169     89.0
2059.0     0.168     90.6
2060.0     0.166     92.2
2061.0     0.164     93.8
2062.0     0.163     95.5
2063.0     0.161     97.2
2064.0     0.160     99.0
2065.0     0.158    100.8
2066.0     0.156    102.6
2067.0     0.155    104.4
2068.0     0.153    106.3
2069.0     0.152    108.3
2070.0     0.150    110.2
2071.0     0.149    112.3
2072.0     0.147    114.3
2073.0     0.146    116.4
2074.0     0.144    118.6
2075.0     0.143    120.7
2076.0     0.142    123.0
2077.0     0.140    125.2
2078.0     0.139    127.5
2079.0     0.138    129.9
2080.0     0.137    132.2
2081.0     0.136    134.7
2082.0     0.135    137.1
2083.0     0.134    139.6
2084.0     0.133    142.2
2085.0     0.132    144.7
2086.0     0.131    147.3
2087.0     0.130    150.0
2088.0     0.129    152.6
2089.0     0.129    155.3
2090.0     0.128    158.1
2091.0     0.127    160.8
2092.0     0.127    163.6
2093.0     0.126    166.4
2094.0     0.125    169.3
2095.0     0.125    172.1
2096.0     0.124    175.0
2097.0     0.124    178.0
2098.0     0.123    180.9
2099.0     0.122    183.9
2100.0     0.121    187.0
2101.0     0.121    190.1

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.