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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 18:06:47

Orbital Elements for STF1561AB

WDS:	STF1561AB	WDS ID/Discoverer
P:	1584.380	Orbital period (years)
a:	13.88028	Semi-major axis (arcseconds)
i:	108.687	Inclination (degrees)
Ω:	288.192	Longitude of ascending node (degrees)
T:	1548.997	Epoch of periastron passage (year)
e:	0.63268	Eccentricity
ω:	273.84	Longitude of periastron (degrees)
Start-Year:	1233.0	Year
End-Year:	2817.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for STF1561AB

Position:	113844.90+450630.3	Epoch-2000 right ascension and declination
WDS-ID:	11387+4507	WDS designation
Discoverer Code:	STF1561AB	Discover designation and components
ADS number:	8250	Aitken Double Star catalog
HD number:	101177	HD catalog number
Hipparcos number:	56809	Hipparcos catalog number
V1:	6.53	Magnitude of the primary
V2:	8.23	Magnitude of the secondary
Equinox:		Equinox
Date:	2015	Date of last observation
Orbit grade:	5	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for STF1561AB

WDS 6th Orbit including measures of STF1561AB

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

Ephemeris of STF1561AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     8.859    245.0
-------------------------
1233.0    11.780    127.3
1243.0    11.797    126.5
1253.0    11.804    125.7
1263.0    11.801    124.9
1273.0    11.786    124.1
1283.0    11.759    123.4
1293.0    11.720    122.6
1303.0    11.667    121.8
1313.0    11.599    121.0
1323.0    11.514    120.2
1333.0    11.413    119.3
1343.0    11.293    118.5
1353.0    11.152    117.6
1363.0    10.990    116.7
1373.0    10.803    115.8
1383.0    10.591    114.9
1393.0    10.349    113.9
1403.0    10.076    112.9
1413.0     9.769    111.7
1423.0     9.423    110.6
1433.0     9.035    109.3
1443.0     8.601    107.9
1453.0     8.116    106.3
1463.0     7.574    104.6
1473.0     6.971    102.5
1483.0     6.303    100.1
1493.0     5.565     97.0
1503.0     4.761     92.9
1513.0     3.901     87.0
1523.0     3.017     77.8
1533.0     2.196     61.3
1543.0     1.673     30.4
1553.0     1.805    351.7
1563.0     2.477    326.8
1573.0     3.333    313.6
1583.0     4.203    305.8
1593.0     5.027    300.7
1603.0     5.780    297.0
1613.0     6.458    294.1
1623.0     7.061    291.7
1633.0     7.593    289.7
1643.0     8.062    287.9
1653.0     8.473    286.3
1663.0     8.832    284.9
1673.0     9.144    283.5
1683.0     9.415    282.3
1693.0     9.649    281.1
1703.0     9.849    279.9
1713.0    10.019    278.8
1723.0    10.162    277.8
1733.0    10.281    276.7
1743.0    10.377    275.7
1753.0    10.453    274.7
1763.0    10.511    273.7
1773.0    10.552    272.7
1783.0    10.578    271.8
1793.0    10.590    270.8
1803.0    10.589    269.8
1813.0    10.577    268.8
1823.0    10.554    267.9
1833.0    10.521    266.9
1843.0    10.479    265.9
1853.0    10.429    264.9
1863.0    10.371    263.9
1873.0    10.307    262.9
1883.0    10.236    261.9
1893.0    10.160    260.8
1903.0    10.079    259.8
1913.0     9.993    258.7
1923.0     9.904    257.6
1933.0     9.810    256.5
1943.0     9.714    255.3
1953.0     9.615    254.2
1963.0     9.513    253.0
1973.0     9.410    251.8
1983.0     9.306    250.5
1993.0     9.200    249.3
2003.0     9.094    248.0
2013.0     8.987    246.6
2023.0     8.880    245.3
2033.0     8.774    243.9
2043.0     8.669    242.4
2053.0     8.564    241.0
2063.0     8.462    239.5
2073.0     8.361    238.0
2083.0     8.262    236.4
2093.0     8.166    234.8
2103.0     8.073    233.1
2113.0     7.983    231.4
2123.0     7.897    229.7
2133.0     7.815    228.0
2143.0     7.736    226.2
2153.0     7.663    224.3
2163.0     7.594    222.5
2173.0     7.530    220.6
2183.0     7.472    218.6
2193.0     7.420    216.7
2203.0     7.373    214.7
2213.0     7.333    212.7
2223.0     7.298    210.6
2233.0     7.271    208.6
2243.0     7.249    206.5
2253.0     7.235    204.5
2263.0     7.227    202.4
2273.0     7.227    200.3
2283.0     7.233    198.2
2293.0     7.246    196.2
2303.0     7.265    194.1
2313.0     7.292    192.0
2323.0     7.325    190.0
2333.0     7.365    188.0
2343.0     7.411    186.0
2353.0     7.463    184.0
2363.0     7.521    182.1
2373.0     7.585    180.2
2383.0     7.654    178.3
2393.0     7.728    176.5
2403.0     7.808    174.7
2413.0     7.892    172.9
2423.0     7.980    171.2
2433.0     8.073    169.5
2443.0     8.170    167.9
2453.0     8.270    166.3
2463.0     8.373    164.7
2473.0     8.479    163.2
2483.0     8.588    161.7
2493.0     8.699    160.2
2503.0     8.812    158.8
2513.0     8.927    157.4
2523.0     9.044    156.1
2533.0     9.161    154.8
2543.0     9.280    153.5
2553.0     9.399    152.2
2563.0     9.519    151.0
2573.0     9.638    149.8
2583.0     9.758    148.7
2593.0     9.877    147.6
2603.0     9.995    146.5
2613.0    10.112    145.4
2623.0    10.228    144.3
2633.0    10.342    143.3
2643.0    10.454    142.3
2653.0    10.564    141.3
2663.0    10.672    140.4
2673.0    10.777    139.4
2683.0    10.879    138.5
2693.0    10.977    137.6
2703.0    11.072    136.7
2713.0    11.163    135.8
2723.0    11.250    134.9
2733.0    11.332    134.1
2743.0    11.409    133.2
2753.0    11.480    132.4
2763.0    11.546    131.6
2773.0    11.605    130.8
2783.0    11.658    130.0
2793.0    11.703    129.2
2803.0    11.741    128.4
2813.0    11.770    127.6

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.