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4544 Xanthus (1989 FB)
Classification: Apollo [NEO]          SPK-ID: 2004544
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 167 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .250108626351062 6.6448e-08  
a 1.04202760314625 3.6912e-09 au
q .7814075107034519 6.9516e-08 au
i 14.14496908859688 8.0362e-06 deg
node 23.98048880176584 1.7089e-05 deg
peri 333.8504978859917 2.4659e-05 deg
M 137.0606872152138 3.0748e-05 deg
tp 2459052.579738341736
(2020-Jul-22.07973834)
3.2519e-05 TDB
period 388.5234729150273
1.06
2.0644e-06
5.652e-09
d
yr
n .9265849429867895 4.9234e-09 deg/d
Q 1.302647695589048 4.6144e-09 au
  Orbit Determination Parameters
   # obs. used (total)      901  
   # delay obs. used      0  
   # Doppler obs. used      1  
   data-arc span      11708 days (32.05 yr)  
   first obs. used      1989-03-30  
   last obs. used      2021-04-19  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44888  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-20 06:22:19  

Additional Information
 Earth MOID = .17348 au 
 Jupiter MOID = 4.15127 au 
 T_jup = 5.834 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 17.15   n/a E2021B10  
diameter diameter 1.3 km n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543 based on assumed medium albedo (0.15)
rotation period rot_per 37.65 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Behrend, R. (2007) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]

4544 Xanthus (1989 FB)          Discovered 1989-Mar-31 by Holt and Thomas at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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