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18169 Amaldi (2000 QF)
Classification: Main-belt Asteroid          SPK-ID: 2018169
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1590718777716754 3.8592e-08  
a 3.152526754807347 2.0322e-08 au
q 2.651048404194696 1.23e-07 au
i 10.0989087532561 4.6905e-06 deg
node 246.3863690956423 2.6136e-05 deg
peri 197.8491650882946 3.0154e-05 deg
M 107.8858323110782 1.53e-05 deg
tp 2458387.799105989305
(2018-Sep-26.29910599)
8.5428e-05 TDB
period 2044.497568576488
5.60
1.9769e-05
5.412e-08
d
yr
n .1760823810862516 1.7026e-09 deg/d
Q 3.654005105419998 2.3555e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1670  
   data-arc span      25281 days (69.22 yr)  
   first obs. used      1950-10-17  
   last obs. used      2020-01-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47498  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-29 00:41:45  

Additional Information
 Earth MOID = 1.66898 au 
 Jupiter MOID = 1.62705 au 
 T_jup = 3.164 
[ 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 12.6   n/a MPO344447  
diameter diameter 23.311 km 4.444 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 34.14 h n/a LCDB (Rev. 2019-August); 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. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.033   0.017 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

18169 Amaldi           Discovered 2000 Aug. 20 by V. S. Casulli at the Colleverde di Guidonia.
The nuclear physicist Edoardo Amaldi (1908-1989) was part of the team of Enrico Fermi and contributed to the completion of the first particle accelerator in Italy.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20120406/MPCPages.arcLast Updated: 2012-04-09

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Alternate Designations
 2000 QF = 1950 UA = 1984 WQ = 1998 KR17 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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