Double Star Calculator - Orbit

Orbital Elements for RST3187AB

WDS:	RST3187AB	WDS ID/Discoverer
P:	18.370	Orbital period (years)
a:	0.1661	Semi-major axis (arcseconds)
i:	70.1	Inclination (degrees)
Ω:	40.6	Longitude of ascending node (degrees)
T:	2017.300	Epoch of periastron passage (year)
e:	0.364	Eccentricity
ω:	7.2	Longitude of periastron (degrees)
Start-Year:	2015.815	Year
End-Year:	2034.185	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for RST3187AB
Position:	183648.23-261721.6	Epoch-2000 right ascension and declination
WDS-ID:	18368-2617	WDS designation
Discoverer Code:	RST3187AB	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	171595	HD catalog number
Hipparcos number:	91253	Hipparcos catalog number
V1:	8.47	Magnitude of the primary
V2:	8.96	Magnitude of the secondary
Equinox:	2000	Equinox
Date:		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:	Tok2016e	Reference

Double Star Orbit for RST3187AB

WDS 6th Orbit including measures of RST3187AB

-- 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 RST3187AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.225   223.11
--------------------------
2015.82    0.080    16.04
2015.91    0.084    18.59
2016.01    0.087    20.96
2016.11    0.090    23.15
2016.21    0.093    25.21
2016.31    0.095    27.14
2016.41    0.098    28.97
2016.51    0.100    30.72
2016.61    0.102    32.40
2016.71    0.103    34.02
2016.81    0.105    35.60
2016.91    0.105    37.15
2017.01    0.106    38.69
2017.11    0.106    40.21
2017.21    0.106    41.75
2017.31    0.105    43.30
2017.41    0.104    44.87
2017.51    0.102    46.50
2017.61    0.100    48.17
2017.71    0.098    49.92
2017.81    0.095    51.77
2017.91    0.092    53.72
2018.01    0.089    55.81
2018.11    0.086    58.05
2018.21    0.082    60.50
2018.31    0.078    63.17
2018.41    0.074    66.11
2018.51    0.070    69.39
2018.61    0.067    73.04
2018.71    0.063    77.14
2018.81    0.059    81.76
2018.91    0.056    86.96
2019.01    0.053    92.78
2019.11    0.050    99.24
2019.21    0.048   106.30
2019.31    0.047   113.85
2019.41    0.047   121.69
2019.51    0.047   129.57
2019.61    0.048   137.25
2019.71    0.050   144.49
2019.81    0.052   151.15
2019.91    0.055   157.16
2020.01    0.058   162.52
2020.11    0.062   167.27
2020.21    0.066   171.45
2020.31    0.070   175.15
2020.41    0.075   178.42
2020.51    0.079   181.32
2020.61    0.084   183.90
2020.71    0.088   186.22
2020.81    0.093   188.30
2020.91    0.098   190.19
2021.01    0.102   191.91
2021.11    0.107   193.47
2021.21    0.111   194.91
2021.31    0.116   196.24
2021.41    0.120   197.47
2021.51    0.125   198.61
2021.61    0.129   199.67
2021.71    0.133   200.66
2021.81    0.138   201.60
2021.91    0.142   202.48
2022.01    0.146   203.31
2022.11    0.150   204.09
2022.21    0.153   204.84
2022.31    0.157   205.55
2022.41    0.161   206.23
2022.51    0.164   206.88
2022.61    0.168   207.50
2022.71    0.171   208.09
2022.81    0.174   208.67
2022.91    0.178   209.22
2023.01    0.181   209.76
2023.11    0.184   210.27
2023.21    0.186   210.77
2023.31    0.189   211.26
2023.41    0.192   211.73
2023.51    0.194   212.19
2023.61    0.197   212.64
2023.71    0.199   213.07
2023.81    0.202   213.50
2023.91    0.204   213.92
2024.01    0.206   214.33
2024.11    0.208   214.73
2024.21    0.210   215.12
2024.31    0.211   215.51
2024.41    0.213   215.89
2024.51    0.215   216.26
2024.61    0.216   216.63
2024.71    0.217   217.00
2024.81    0.219   217.36
2024.91    0.220   217.72
2025.01    0.221   218.07
2025.11    0.222   218.42
2025.21    0.223   218.77
2025.31    0.223   219.11
2025.41    0.224   219.45
2025.51    0.225   219.79
2025.61    0.225   220.13
2025.71    0.225   220.47
2025.81    0.226   220.81
2025.91    0.226   221.14
2026.01    0.226   221.48
2026.11    0.226   221.82
2026.21    0.226   222.15
2026.31    0.226   222.49
2026.41    0.225   222.83
2026.51    0.225   223.16
2026.61    0.224   223.50
2026.71    0.224   223.85
2026.81    0.223   224.19
2026.91    0.222   224.53
2027.01    0.221   224.88
2027.11    0.220   225.23
2027.21    0.219   225.59
2027.31    0.218   225.95
2027.41    0.217   226.31
2027.51    0.216   226.68
2027.61    0.214   227.05
2027.71    0.213   227.42
2027.81    0.211   227.81
2027.91    0.209   228.20
2028.01    0.207   228.59
2028.11    0.205   228.99
2028.21    0.203   229.40
2028.31    0.201   229.82
2028.41    0.199   230.25
2028.51    0.197   230.69
2028.61    0.195   231.13
2028.71    0.192   231.59
2028.81    0.190   232.06
2028.91    0.187   232.55
2029.01    0.184   233.04
2029.11    0.181   233.56
2029.21    0.179   234.09
2029.31    0.176   234.63
2029.41    0.173   235.20
2029.51    0.169   235.79
2029.61    0.166   236.39
2029.71    0.163   237.03
2029.81    0.159   237.69
2029.91    0.156   238.38
2030.01    0.153   239.10
2030.11    0.149   239.85
2030.21    0.145   240.64
2030.31    0.142   241.48
2030.41    0.138   242.36
2030.51    0.134   243.29
2030.61    0.130   244.27
2030.71    0.126   245.32
2030.81    0.122   246.43
2030.91    0.118   247.63
2031.01    0.114   248.90
2031.11    0.110   250.28
2031.21    0.105   251.76
2031.31    0.101   253.36
2031.41    0.097   255.11
2031.51    0.093   257.00
2031.61    0.089   259.08
2031.71    0.085   261.36
2031.81    0.081   263.87
2031.91    0.077   266.64
2032.01    0.073   269.71
2032.11    0.069   273.11
2032.21    0.066   276.89
2032.31    0.062   281.07
2032.41    0.059   285.70
2032.51    0.057   290.78
2032.61    0.055   296.31
2032.71    0.053   302.25
2032.81    0.052   308.54
2032.91    0.051   315.06
2033.01    0.051   321.66
2033.11    0.051   328.21
2033.21    0.053   334.55
2033.31    0.054   340.57
2033.41    0.056   346.19
2033.51    0.059   351.38
2033.61    0.062   356.13
2033.71    0.065     0.45
2033.81    0.068     4.37
2033.91    0.071     7.93
2034.01    0.074    11.17
2034.11    0.078    14.12

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 17:53:24