Double Star Calculator - Orbit

Orbital Elements for ALPPHE

WDS:	ALPPHE	WDS ID/Discoverer
P:	10.538	Orbital period (years)
a:	0.1035	Semi-major axis (arcseconds)
i:	128.0	Inclination (degrees)
Ω:	242.8	Longitude of ascending node (degrees)
T:	1903.235	Epoch of periastron passage (year)
e:	0.34	Eccentricity
ω:	19.8	Longitude of periastron (degrees)
Start-Year:	2019.7311674104944	Year
End-Year:	2030.2688325895056	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for ALPPHE
Position:	002616.87-421818.4	Epoch-2000 right ascension and declination
WDS-ID:	00262-4217	WDS designation
Discoverer Code:	ALPPHE	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	2261	HD catalog number
Hipparcos number:	2081	Hipparcos catalog number
V1:	2.37	Magnitude of the primary
V2:	.	Magnitude of the secondary
Equinox:		Equinox
Date:	1992	Date of last observation
Orbit grade:	9	Orbit grade, ranging from : 1 = Definitive 2 = Good 3 = Reliable 4 = Preliminary 5 = Indeterminate
Flags:	n	Flags
Ephemerides:		Ephemerides
Code:	Jnc2005	Reference

Double Star Orbit for ALPPHE

WDS 6th Orbit including measures of ALPPHE

-- 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 ALPPHE

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.090    15.90
--------------------------
2019.73    0.053   194.94
2019.83    0.051   187.08
2019.93    0.050   178.77
2020.03    0.049   170.16
2020.13    0.050   161.49
2020.23    0.051   153.01
2020.33    0.052   144.94
2020.43    0.054   137.45
2020.53    0.057   130.61
2020.63    0.060   124.45
2020.73    0.064   118.92
2020.83    0.067   113.99
2020.93    0.071   109.58
2021.03    0.075   105.62
2021.13    0.079   102.06
2021.23    0.083    98.83
2021.33    0.087    95.89
2021.43    0.091    93.20
2021.53    0.094    90.72
2021.63    0.098    88.42
2021.73    0.101    86.28
2021.83    0.105    84.28
2021.93    0.108    82.40
2022.03    0.111    80.63
2022.13    0.114    78.94
2022.23    0.116    77.34
2022.33    0.119    75.80
2022.43    0.121    74.33
2022.53    0.123    72.91
2022.63    0.125    71.54
2022.73    0.127    70.20
2022.83    0.129    68.91
2022.93    0.130    67.65
2023.03    0.132    66.41
2023.13    0.133    65.20
2023.23    0.134    64.00
2023.33    0.135    62.82
2023.43    0.135    61.66
2023.53    0.136    60.51
2023.63    0.136    59.36
2023.73    0.136    58.22
2023.83    0.136    57.08
2023.93    0.136    55.94
2024.03    0.136    54.80
2024.13    0.136    53.65
2024.23    0.135    52.49
2024.33    0.134    51.33
2024.43    0.134    50.15
2024.53    0.133    48.95
2024.63    0.131    47.73
2024.73    0.130    46.50
2024.83    0.129    45.23
2024.93    0.127    43.94
2025.03    0.126    42.62
2025.13    0.124    41.26
2025.23    0.122    39.85
2025.33    0.120    38.41
2025.43    0.118    36.91
2025.53    0.116    35.36
2025.63    0.113    33.75
2025.73    0.111    32.06
2025.83    0.109    30.31
2025.93    0.106    28.46
2026.03    0.103    26.53
2026.13    0.101    24.49
2026.23    0.098    22.34
2026.33    0.095    20.07
2026.43    0.092    17.65
2026.53    0.089    15.08
2026.63    0.087    12.35
2026.73    0.084     9.43
2026.83    0.081     6.30
2026.93    0.078     2.96
2027.03    0.076   359.39
2027.13    0.073   355.56
2027.23    0.071   351.47
2027.33    0.069   347.11
2027.43    0.067   342.49
2027.53    0.065   337.60
2027.63    0.064   332.48
2027.73    0.062   327.14
2027.83    0.062   321.64
2027.93    0.061   316.03
2028.03    0.061   310.36
2028.13    0.061   304.69
2028.23    0.062   299.09
2028.33    0.062   293.59
2028.43    0.063   288.23
2028.53    0.064   283.04
2028.63    0.066   278.02
2028.73    0.067   273.18
2028.83    0.068   268.49
2028.93    0.069   263.94
2029.03    0.069   259.50
2029.13    0.070   255.14
2029.23    0.070   250.82
2029.33    0.070   246.49
2029.43    0.069   242.11
2029.53    0.068   237.63
2029.63    0.067   232.98
2029.73    0.065   228.10
2029.83    0.063   222.93
2029.93    0.061   217.37
2030.03    0.058   211.37
2030.13    0.056   204.84
2030.23    0.054   197.75

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 14:39:21