Double Star Calculator - Orbit

Orbital Elements for A550

WDS:	A550	WDS ID/Discoverer
P:	21.062	Orbital period (years)
a:	0.0939	Semi-major axis (arcseconds)
i:	150.5	Inclination (degrees)
Ω:	34.5	Longitude of ascending node (degrees)
T:	2002.583	Epoch of periastron passage (year)
e:	0.844	Eccentricity
ω:	47.8	Longitude of periastron (degrees)
Start-Year:	2014.469	Year
End-Year:	2035.531	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for A550
Position:	082740.81-042453.2	Epoch-2000 right ascension and declination
WDS-ID:	08277-0425	WDS designation
Discoverer Code:	A550	Discover designation and components
ADS number:	6825	Aitken Double Star catalog
HD number:	71499	HD catalog number
Hipparcos number:	41489	Hipparcos catalog number
V1:	7.47	Magnitude of the primary
V2:	7.91	Magnitude of the secondary
Equinox:		Equinox
Date:		Date of last observation
Orbit grade:	2	Orbit grade, ranging from : 1 = Definitive 2 = Good 3 = Reliable 4 = Preliminary 5 = Indeterminate
Flags:	n	Flags
Ephemerides:		Ephemerides
Code:	Tok2024c	Reference

Double Star Orbit for A550

WDS 6th Orbit including measures of A550

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

Legend:

Green plus signs:	Visual (micrometric) measures
Violet asterisks:	Photographic measures
Blue symbols:	Various interferometric techniques
Dot-dash line:	Indicates the line of nodes

Ephemeris of A550

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.102   197.95
--------------------------
2014.47    0.158   166.95
2014.57    0.158   166.66
2014.67    0.157   166.38
2014.77    0.157   166.09
2014.87    0.156   165.81
2014.97    0.156   165.52
2015.07    0.155   165.23
2015.17    0.155   164.94
2015.27    0.154   164.64
2015.37    0.154   164.35
2015.47    0.153   164.05
2015.57    0.153   163.75
2015.67    0.152   163.45
2015.77    0.152   163.14
2015.87    0.151   162.83
2015.97    0.150   162.52
2016.07    0.150   162.21
2016.17    0.149   161.90
2016.27    0.148   161.58
2016.37    0.147   161.25
2016.47    0.147   160.93
2016.57    0.146   160.60
2016.67    0.145   160.27
2016.77    0.144   159.93
2016.87    0.144   159.59
2016.97    0.143   159.25
2017.07    0.142   158.90
2017.17    0.141   158.55
2017.27    0.140   158.19
2017.37    0.139   157.83
2017.47    0.138   157.46
2017.57    0.137   157.09
2017.67    0.136   156.71
2017.77    0.135   156.33
2017.87    0.134   155.94
2017.97    0.133   155.55
2018.07    0.132   155.14
2018.17    0.131   154.73
2018.27    0.129   154.32
2018.37    0.128   153.89
2018.47    0.127   153.46
2018.57    0.126   153.02
2018.67    0.124   152.57
2018.77    0.123   152.11
2018.87    0.122   151.64
2018.97    0.120   151.16
2019.07    0.119   150.67
2019.17    0.118   150.17
2019.27    0.116   149.66
2019.37    0.115   149.13
2019.47    0.113   148.59
2019.57    0.112   148.04
2019.67    0.110   147.47
2019.77    0.109   146.88
2019.87    0.107   146.27
2019.97    0.105   145.65
2020.07    0.104   145.01
2020.17    0.102   144.35
2020.27    0.100   143.66
2020.37    0.099   142.95
2020.47    0.097   142.21
2020.57    0.095   141.44
2020.67    0.093   140.65
2020.77    0.091   139.82
2020.87    0.089   138.95
2020.97    0.087   138.04
2021.07    0.085   137.09
2021.17    0.083   136.10
2021.27    0.081   135.05
2021.37    0.079   133.94
2021.47    0.076   132.77
2021.57    0.074   131.52
2021.67    0.072   130.20
2021.77    0.069   128.79
2021.87    0.067   127.27
2021.97    0.064   125.64
2022.07    0.062   123.87
2022.17    0.059   121.95
2022.27    0.057   119.85
2022.37    0.054   117.53
2022.47    0.051   114.96
2022.57    0.048   112.08
2022.67    0.045   108.83
2022.77    0.042   105.10
2022.87    0.039   100.78
2022.97    0.036    95.67
2023.07    0.032    89.53
2023.17    0.029    81.95
2023.27    0.025    72.32
2023.37    0.022    59.61
2023.47    0.018    42.06
2023.57    0.015    16.76
2023.67    0.013   341.43
2023.77    0.015   303.88
2023.87    0.018   276.68
2023.97    0.023   259.59
2024.07    0.028   248.40
2024.17    0.032   240.52
2024.27    0.037   234.61
2024.37    0.041   229.97
2024.47    0.045   226.20
2024.57    0.049   223.04
2024.67    0.053   220.33
2024.77    0.056   217.98
2024.87    0.060   215.90
2024.97    0.063   214.04
2025.07    0.066   212.37
2025.17    0.069   210.84
2025.27    0.072   209.44
2025.37    0.075   208.15
2025.47    0.078   206.95
2025.57    0.081   205.83
2025.67    0.083   204.78
2025.77    0.086   203.80
2025.87    0.088   202.87
2025.97    0.091   201.99
2026.07    0.093   201.15
2026.17    0.095   200.35
2026.27    0.097   199.59
2026.37    0.099   198.86
2026.47    0.101   198.16
2026.57    0.103   197.49
2026.67    0.105   196.85
2026.77    0.107   196.22
2026.87    0.109   195.62
2026.97    0.111   195.04
2027.07    0.113   194.47
2027.17    0.114   193.93
2027.27    0.116   193.40
2027.37    0.118   192.88
2027.47    0.119   192.38
2027.57    0.121   191.89
2027.67    0.122   191.41
2027.77    0.124   190.95
2027.87    0.125   190.49
2027.97    0.126   190.05
2028.07    0.128   189.61
2028.17    0.129   189.19
2028.27    0.130   188.77
2028.37    0.132   188.36
2028.47    0.133   187.96
2028.57    0.134   187.56
2028.67    0.135   187.17
2028.77    0.136   186.79
2028.87    0.137   186.42
2028.97    0.139   186.05
2029.07    0.140   185.68
2029.17    0.141   185.32
2029.27    0.142   184.97
2029.37    0.143   184.62
2029.47    0.143   184.28
2029.57    0.144   183.94
2029.67    0.145   183.60
2029.77    0.146   183.27
2029.87    0.147   182.94
2029.97    0.148   182.62
2030.07    0.148   182.30
2030.17    0.149   181.98
2030.27    0.150   181.67
2030.37    0.151   181.36
2030.47    0.151   181.05
2030.57    0.152   180.74
2030.67    0.153   180.44
2030.77    0.153   180.14
2030.87    0.154   179.84
2030.97    0.154   179.54
2031.07    0.155   179.25
2031.17    0.155   178.96
2031.27    0.156   178.67
2031.37    0.156   178.38
2031.47    0.157   178.09
2031.57    0.157   177.80
2031.67    0.158   177.52
2031.77    0.158   177.24
2031.87    0.158   176.96
2031.97    0.159   176.68
2032.07    0.159   176.40
2032.17    0.159   176.12
2032.27    0.160   175.85
2032.37    0.160   175.57
2032.47    0.160   175.30
2032.57    0.160   175.02
2032.67    0.161   174.75
2032.77    0.161   174.48
2032.87    0.161   174.20
2032.97    0.161   173.93
2033.07    0.161   173.66
2033.17    0.161   173.39
2033.27    0.161   173.12
2033.37    0.161   172.85
2033.47    0.161   172.58
2033.57    0.162   172.31
2033.67    0.162   172.04
2033.77    0.161   171.77
2033.87    0.161   171.50
2033.97    0.161   171.23
2034.07    0.161   170.96
2034.17    0.161   170.69
2034.27    0.161   170.42
2034.37    0.161   170.15
2034.47    0.161   169.88
2034.57    0.161   169.61
2034.67    0.160   169.33
2034.77    0.160   169.06
2034.87    0.160   168.79
2034.97    0.160   168.51
2035.07    0.160   168.23
2035.17    0.159   167.96
2035.27    0.159   167.68
2035.37    0.159   167.40
2035.47    0.158   167.12

Disclaimer

This result is provided without warranty. For all terms, see the Full Disclaimer. Copyright (C) 2025. Unless otherwise noted, all output generated by the Double Star Calculator including orbit diagrams, ephemerides, and analytical reports is licensed under CC BY 4.0.

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.

Report Information

Double Star Calculator:		Version 1.2 ($Rev: 2397 $)
Report created:		2026-06-25 16:07:47