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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1590176751754707 3.4649e-08  
a 3.152259574951301 1.8852e-08 au
q 2.650994585792928 1.0746e-07 au
i 10.09916936854096 4.439e-06 deg
node 246.385307632809 2.4599e-05 deg
peri 197.7956772400809 2.866e-05 deg
M 143.1768847570574 1.5367e-05 deg
tp 2458387.478943156215
(2018-Sep-25.97894316)
8.5023e-05 TDB
period 2044.237664203933
5.60
1.8338e-05
5.021e-08
d
yr
n .1761047681998322 1.5798e-09 deg/d
Q 3.653524564109675 2.185e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1935  
   data-arc span      25506 days (69.83 yr)  
   first obs. used      1950-10-17  
   last obs. used      2020-08-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45702  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 02:16:32  

Additional Information
 Earth MOID = 1.66854 au 
 Jupiter MOID = 1.62805 au 
 T_jup = 3.164 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456978.5 (2014-Nov-17.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1602896266413861 3.4601e-08  
q 2.646601038249992 1.0739e-07 au
tp 2456344.566911592605
(2013-Feb-21.06691159)
8.1549e-05 TDB
node 246.4123263477975 2.4594e-05 deg
peri 198.1768915346289 2.8599e-05 deg
i 10.10173074618678 4.44e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1935  
   data-arc span      25506 days (69.83 yr)  
   first obs. used      1950-10-17  
   last obs. used      2020-08-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45702  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 02:16:32  

Additional Information
 Jupiter MOID = 1.62805 au 
 T_jup = 3.164 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.197204926958086E-15 -3.676355329690036E-15 -6.211118427486005E-13 3.590806765564964E-15 -1.119396857422863E-13 -4.619402602310567E-16
q -3.676355329690036E-15 1.153159115003106E-14 2.012112543178491E-12 -1.228592413805775E-14 3.783207823452445E-13 1.946841213014187E-15
tp -6.211118427486005E-13 2.012112543178491E-12 6.650181470939496E-9 -9.439275064379685E-12 1.21480737380998E-9 2.700427123226394E-12
node 3.590806765564964E-15 -1.228592413805775E-14 -9.439275064379685E-12 6.048471220573712E-10 -5.97094432942091E-10 -3.349666748655464E-11
peri -1.119396857422863E-13 3.783207823452445E-13 1.21480737380998E-9 -5.97094432942091E-10 8.179236992908258E-10 3.351007337296308E-11
i -4.619402602310567E-16 1.946841213014187E-15 2.700427123226394E-12 -3.349666748655464E-11 3.351007337296308E-11 1.971367598323396E-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 12.70   n/a E2021B10  
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. 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. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
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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