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JPL Small-Body Database Browser
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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 148 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2501436574111234 7.6648e-08  
a 1.042099590416156 8.1786e-09 au
q .7814249874828249 7.8034e-08 au
i 14.14525295451515 8.3827e-06 deg
node 23.98874633360744 1.8787e-05 deg
peri 333.8424487406808 2.7237e-05 deg
M 301.1389582079657 4.5732e-05 deg
tp 2458664.031295067192
(2019-Jun-29.53129507)
5.0059e-05 TDB
period 388.5637346514723
1.06
4.5743e-06
1.252e-08
d
yr
n .9264889332065614 1.0907e-08 deg/d
Q 1.302774193349487 1.0224e-08 au
  Orbit Determination Parameters
   # obs. used (total)      814  
   # delay obs. used      0  
   # Doppler obs. used      1  
   data-arc span      7629 days (20.89 yr)  
   first obs. used      1989-03-30  
   last obs. used      2010-02-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44121  
   source      ORB  
   producer      Otto Matic  
   solution date      2017-Apr-06 09:30:34  

Additional Information
 Earth MOID = .17315 au 
 Jupiter MOID = 4.14691 au 
 T_jup = 5.833 
[ 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 17.1   n/a PDS3 (MPC 17272)  
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. 2019-January); 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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