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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1590718768756827 3.8212e-08  
a 3.152526755363829 2.0191e-08 au
q 2.651048407487299 1.2153e-07 au
i 10.09890891361172 4.6585e-06 deg
node 246.3863693313346 2.6092e-05 deg
peri 197.8491653913118 3.0099e-05 deg
M 107.8858316218603 1.5284e-05 deg
tp 2458387.799109741253
(2018-Sep-26.29910974)
8.5338e-05 TDB
period 2044.497569117828
5.60
1.9641e-05
5.377e-08
d
yr
n .1760823810396287 1.6916e-09 deg/d
Q 3.65400510324036 2.3402e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1706  
   data-arc span      25308 days (69.29 yr)  
   first obs. used      1950-10-17  
   last obs. used      2020-01-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47492  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 22:20:41  

Additional Information
 Earth MOID = 1.66898 au 
 Jupiter MOID = 1.62705 au 
 T_jup = 3.164 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456603.5 (2013-Nov-07.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1606090907161845 3.8177e-08  
q 2.646302235396324 1.2186e-07 au
tp 2456344.965987354641
(2013-Feb-21.46598735)
8.2603e-05 TDB
node 246.4173176170311 2.6084e-05 deg
peri 198.2378264639047 3.0019e-05 deg
i 10.10171939927225 4.6597e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1706  
   data-arc span      25308 days (69.29 yr)  
   first obs. used      1950-10-17  
   last obs. used      2020-01-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47492  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 22:20:41  

Additional Information
 Jupiter MOID = 1.62705 au 
 T_jup = 3.164 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.457467174161457E-15 -4.607192453363443E-15 -4.040512973093872E-13 3.484605617701375E-15 -5.256081697866413E-14 -8.15890904968078E-16
q -4.607192453363443E-15 1.484990765703132E-14 1.253075987052208E-12 -1.209599596504829E-14 1.691881653199497E-13 2.937247593111776E-15
tp -4.040512973093872E-13 1.253075987052208E-12 6.823173694396514E-9 -1.172338404456726E-12 1.254733596873311E-9 3.871461393749191E-12
node 3.484605617701375E-15 -1.209599596504829E-14 -1.172338404456726E-12 6.803763892852218E-10 -6.698086781797671E-10 -2.149520491935712E-11
peri -5.256081697866413E-14 1.691881653199497E-13 1.254733596873311E-9 -6.698086781797671E-10 9.011409799348843E-10 2.190179444103826E-11
i -8.15890904968078E-16 2.937247593111776E-15 3.871461393749191E-12 -2.149520491935712E-11 2.190179444103826E-11 2.171303344669187E-11

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

[ show close-approach data ]
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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