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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 17:00:05

Orbital Elements for BU1185

WDS:	BU1185	WDS ID/Discoverer
P:	27.520	Orbital period (years)
a:	0.25	Semi-major axis (arcseconds)
i:	97.2	Inclination (degrees)
Ω:	23.3	Longitude of ascending node (degrees)
T:	2030.530	Epoch of periastron passage (year)
e:	0.038	Eccentricity
ω:	327.2	Longitude of periastron (degrees)
Start-Year:	2012.0	Year
End-Year:	2038.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for BU1185

Position:	042551.66+185150.9	Epoch-2000 right ascension and declination
WDS-ID:	04259+1852	WDS designation
Discoverer Code:	BU1185	Discover designation and components
ADS number:	3210	Aitken Double Star catalog
HD number:	27989	HD catalog number
Hipparcos number:	20686	Hipparcos catalog number
V1:	8.09	Magnitude of the primary
V2:	8.89	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2020	Date of last observation
Orbit grade:	2	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for BU1185

WDS 6th Orbit including measures of BU1185

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

Ephemeris of BU1185

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.087    183.7
-------------------------
2012.0     0.033    304.5
2013.0     0.059    235.9
2014.0     0.107    219.4
2015.0     0.153    213.2
2016.0     0.194    209.8
2017.0     0.225    207.4
2018.0     0.247    205.6
2019.0     0.257    204.0
2020.0     0.255    202.5
2021.0     0.242    200.8
2022.0     0.217    198.9
2023.0     0.181    196.3
2024.0     0.137    192.2
2025.0     0.087    183.7
2026.0     0.040    152.8
2027.0     0.045     65.8
2028.0     0.094     40.8
2029.0     0.143     33.2
2030.0     0.185     29.4
2031.0     0.216     26.8
2032.0     0.236     24.8
2033.0     0.242     23.1
2034.0     0.234     21.3
2035.0     0.214     19.2
2036.0     0.182     16.6
2037.0     0.141     12.7

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.