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

Double Star Calculator - Orbit

- Revision:   $Rev: 1216 $
- Report created:   2025-07-11 18:59:55

Orbital Elements for OL20
WDS: OL20 WDS ID/Discoverer
P: 490.000 Orbital period (years)
a: 0.607 Semi-major axis (arcseconds)
i: 109.0 Inclination (degrees)
Ω: 162.4 Longitude of ascending node (degrees)
T: 2030.600 Epoch of periastron passage (year)
e: 0.46 Eccentricity
ω: 304.0 Longitude of periastron (degrees)
Start-Year: 1780.0 Year
End-Year: 2270.0 Year
Epoch: 2025.0 Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for OL20
Position: 184450.80-332301.6 Epoch-2000 right ascension and declination
WDS-ID: 18448-3323 WDS designation
Discoverer Code: OL20 Discover designation and components
ADS number: . Aitken Double Star catalog
HD number: 173044 HD catalog number
Hipparcos number: 91978 Hipparcos catalog number
V1: 8.47 Magnitude of the primary
V2: 8.78 Magnitude of the secondary
Equinox: Equinox
Date: 2018 Date of last observation
Orbit grade: 4 Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags: Flags

Double Star Orbit for OL20
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ValueError		 Python 3.12.3: /usr/bin/python3
Fri Jul 11 18:59:55 2025

A problem occurred in a Python script. Here is the sequence of function calls leading up to the error, in the order they occurred.

 /var/www/cgi-bin/ds_orbit.py in <module>
    891 
    892 # Smooth curve if necessary
=>  893 x_smooth, y_smooth = Q_get_smoothed_orbit(x_list, y_list)
    894 plt.plot(x_smooth, y_smooth, label=f'Orbit of {wds}', color='#528B8B')
    895 
x_smooth undefined, y_smooth undefined, Q_get_smoothed_orbit = <function Q_get_smoothed_orbit>, x_list = [-0.08933374195218441, -0.08734814328996308, -0.08535792614804012, -0.083363197108411, -0.08136406260677473, -0.07936062895016203, -0.07735300233454025, -0.07534128886241638, -0.07332559456043554, -0.07130602539699414, -0.06928268729986996, -0.06725568617387212, -0.06522512791853623, -0.06319111844585573, -0.061153763698065924, -0.059113169665491454, -0.057069442404462226, -0.05502268805530486, -0.05297301286042428, -0.05092052318247815, ...], y_list = [0.5247627378404615, 0.5283871923418094, 0.5319837087396684, 0.5355521052777814, 0.5390921997323341, 0.5426038093812396, 0.5460867509735193, 0.5495408406987387, 0.5529658941565014, 0.5563617263259727, 0.5597281515354239, 0.5630649834317967, 0.5663720349502418, 0.5696491182836522, 0.57289604485216, 0.5761126252725849, 0.5792986693278228, 0.5824539859361705, 0.5855783831205591, 0.5886716679776993, ...]
 /var/www/cgi-bin/ds_orbit.py in Q_get_smoothed_orbit(x_list=[-0.08933374195218441, -0.08734814328996308, -0.08535792614804012, -0.083363197108411, -0.08136406260677473, -0.07936062895016203, -0.07735300233454025, -0.07534128886241638, -0.07332559456043554, -0.07130602539699414, -0.06928268729986996, -0.06725568617387212, -0.06522512791853623, -0.06319111844585573, -0.061153763698065924, -0.059113169665491454, -0.057069442404462226, -0.05502268805530486, -0.05297301286042428, -0.05092052318247815, ...], y_list=[0.5247627378404615, 0.5283871923418094, 0.5319837087396684, 0.5355521052777814, 0.5390921997323341, 0.5426038093812396, 0.5460867509735193, 0.5495408406987387, 0.5529658941565014, 0.5563617263259727, 0.5597281515354239, 0.5630649834317967, 0.5663720349502418, 0.5696491182836522, 0.57289604485216, 0.5761126252725849, 0.5792986693278228, 0.5824539859361705, 0.5855783831205591, 0.5886716679776993, ...])
    272     # Nur wenn ausreichend Punkte vorhanden sind
    273     if len(x) >= 4:
=>  274         tck, u = splprep([x, y], s=0.0, per=True) # per=True für geschlossene Kurve (Orbit)
    275         u_fine = np.linspace(0, 1, 300)           # Feinere Parameterwerte
    276         return splev(u_fine, tck)
tck undefined, u undefined, splprep = <function splprep>, x = array([-0.25133296, -0.25196559, -0.25257504, -0...5, -0.24929902, -0.24999938, -0.25067746]), y = array([-5.72526711e-04, -6.00797645e-03, -1.1442....57321899e-02, 1.02980416e-02, 4.86297600e-03]), s undefined, per undefined
 /usr/lib/python3/dist-packages/scipy/interpolate/_fitpack_py.py in splprep(x=[array([-0.25133296, -0.25196559, -0.25257504, -0...5, -0.24929902, -0.24999938, -0.25067746]), array([-5.72526711e-04, -6.00797645e-03, -1.1442....57321899e-02, 1.02980416e-02, 4.86297600e-03])], w=None, u=None, ub=None, ue=None, k=3, task=0, s=0.0, t=None, full_output=0, nest=None, per=True, quiet=1)
    153     """
    154 
=>  155     res = _impl.splprep(x, w, u, ub, ue, k, task, s, t, full_output, nest, per,
=>  156                         quiet)
    157     return res
res undefined, global _impl = <module 'scipy.interpolate._fitpack_impl' from '...ist-packages/scipy/interpolate/_fitpack_impl.py'>, _impl.splprep = <function splprep>, x = [array([-0.25133296, -0.25196559, -0.25257504, -0...5, -0.24929902, -0.24999938, -0.25067746]), array([-5.72526711e-04, -6.00797645e-03, -1.1442....57321899e-02, 1.02980416e-02, 4.86297600e-03])], w = None, u = None, ub = None, ue = None, k = 3, task = 0, s = 0.0, t = None, full_output = 0, nest = None, per = True, quiet = 1
 /usr/lib/python3/dist-packages/scipy/interpolate/_fitpack_impl.py in splprep(x=array([[-2.51332962e-01, -2.51965589e-01, -2.525...e-02, 1.02980416e-02, -5.72526711e-04]]), w=array([1., 1., 1., 1., 1., 1., 1., 1., 1., 1., 1... 1., 1., 1., 1., 1., 1., 1., 1., 1., 1., 1., 1.]), u=array([0. , 0.00218273, 0.00436418, 0.006...5985, 0.99344594, 0.99563144, 1. ]), ub=0, ue=1, k=3, task=0, s=0.0, t=array([], dtype=float64), full_output=0, nest=497, per=True, quiet=1)
    172     wrk = _parcur_cache['wrk']
    173     iwrk = _parcur_cache['iwrk']
=>  174     t, c, o = _fitpack._parcur(ravel(transpose(x)), w, u, ub, ue, k,
=>  175                                task, ipar, s, t, nest, wrk, iwrk, per)
    176     _parcur_cache['u'] = o['u']
t = array([], dtype=float64), c undefined, o undefined, global _fitpack = <module 'scipy.interpolate._fitpack' from '/usr/...polate/_fitpack.cpython-312-x86_64-linux-gnu.so'>, _fitpack._parcur = <built-in function _parcur>, global ravel = <function ravel>, global transpose = <function transpose>, x = array([[-2.51332962e-01, -2.51965589e-01, -2.525...e-02, 1.02980416e-02, -5.72526711e-04]]), w = array([1., 1., 1., 1., 1., 1., 1., 1., 1., 1., 1... 1., 1., 1., 1., 1., 1., 1., 1., 1., 1., 1., 1.]), u = array([0. , 0.00218273, 0.00436418, 0.006...5985, 0.99344594, 0.99563144, 1. ]), ub = 0, ue = 1, k = 3, task = 0, ipar = False, s = 0.0, nest = 497, wrk = array([], dtype=float64), iwrk = array([], dtype=int32), per = True

ValueError: Invalid inputs.
      add_note = <built-in method add_note of ValueError object>
      args = ('Invalid inputs.',)
      with_traceback = <built-in method with_traceback of ValueError object>