Double Star Calculator - Orbit

Orbital Elements for ELP2

WDS:	ELP2	WDS ID/Discoverer
P:	10.310	Orbital period (years)
a:	0.111	Semi-major axis (arcseconds)
i:	119.0	Inclination (degrees)
Ω:	306.5	Longitude of ascending node (degrees)
T:	2019.510	Epoch of periastron passage (year)
e:	0.424	Eccentricity
ω:	168.5	Longitude of periastron (degrees)
Start-Year:	2019.845	Year
End-Year:	2030.155	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for ELP2
Position:	081350.99-073824.6	Epoch-2000 right ascension and declination
WDS-ID:	08138-0738	WDS designation
Discoverer Code:	ELP2	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	.	HD catalog number
Hipparcos number:	.	Hipparcos catalog number
V1:		Magnitude of the primary
V2:		Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2021	Date of last observation
Orbit grade:	3	Orbit grade, ranging from : 1 = Definitive 2 = Good 3 = Reliable 4 = Preliminary 5 = Indeterminate
Flags:		Flags
Ephemerides:		Ephemerides
Code:	Tok2021c	Reference

Double Star Orbit for ELP2

WDS 6th Orbit including measures of ELP2

-- 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 ELP2

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.137   297.00
--------------------------
2019.85    0.064   116.75
2019.94    0.063   112.03
2020.04    0.061   107.06
2020.14    0.058   101.74
2020.24    0.056    95.97
2020.34    0.054    89.67
2020.44    0.051    82.77
2020.54    0.049    75.27
2020.64    0.048    67.21
2020.74    0.047    58.74
2020.84    0.047    50.10
2020.94    0.047    41.56
2021.04    0.049    33.39
2021.14    0.051    25.79
2021.24    0.054    18.87
2021.34    0.057    12.66
2021.44    0.060     7.15
2021.54    0.064     2.28
2021.64    0.068   357.96
2021.74    0.072   354.14
2021.84    0.077   350.73
2021.94    0.081   347.69
2022.04    0.085   344.94
2022.14    0.089   342.46
2022.24    0.094   340.21
2022.34    0.098   338.14
2022.44    0.102   336.24
2022.54    0.106   334.49
2022.64    0.109   332.86
2022.74    0.113   331.33
2022.84    0.117   329.90
2022.94    0.120   328.56
2023.04    0.124   327.29
2023.14    0.127   326.08
2023.24    0.130   324.93
2023.34    0.133   323.83
2023.44    0.135   322.78
2023.54    0.138   321.77
2023.64    0.140   320.79
2023.74    0.143   319.85
2023.84    0.145   318.93
2023.94    0.147   318.04
2024.04    0.148   317.17
2024.14    0.150   316.32
2024.24    0.151   315.49
2024.34    0.153   314.67
2024.44    0.154   313.87
2024.54    0.155   313.07
2024.64    0.156   312.29
2024.74    0.156   311.51
2024.84    0.157   310.74
2024.94    0.157   309.97
2025.04    0.157   309.20
2025.14    0.157   308.43
2025.24    0.157   307.66
2025.34    0.156   306.89
2025.44    0.155   306.11
2025.54    0.155   305.33
2025.64    0.154   304.53
2025.74    0.152   303.72
2025.84    0.151   302.90
2025.94    0.150   302.07
2026.04    0.148   301.21
2026.14    0.146   300.34
2026.24    0.144   299.44
2026.34    0.141   298.51
2026.44    0.139   297.55
2026.54    0.136   296.55
2026.64    0.133   295.51
2026.74    0.130   294.42
2026.84    0.127   293.28
2026.94    0.123   292.07
2027.04    0.120   290.80
2027.14    0.116   289.44
2027.24    0.112   287.98
2027.34    0.108   286.41
2027.44    0.103   284.71
2027.54    0.099   282.85
2027.64    0.094   280.81
2027.74    0.089   278.54
2027.84    0.084   276.01
2027.94    0.079   273.15
2028.04    0.073   269.88
2028.14    0.068   266.11
2028.24    0.063   261.71
2028.34    0.058   256.53
2028.44    0.053   250.38
2028.54    0.049   243.08
2028.64    0.045   234.43
2028.74    0.042   224.42
2028.84    0.040   213.23
2028.94    0.040   201.41
2029.04    0.041   189.69
2029.14    0.043   178.76
2029.24    0.046   169.00
2029.34    0.049   160.50
2029.44    0.052   153.13
2029.54    0.056   146.70
2029.64    0.059   140.98
2029.74    0.062   135.79
2029.84    0.063   130.95
2029.94    0.064   126.32
2030.04    0.065   121.78
2030.14    0.064   117.22

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 16:05:49