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JPL Small-Body Database Browser
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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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1937-Dec-05 01:09 00:03 Jupiter 1.7772804444056 1.7772793129909 1.77728157583211 2.44681796840193 2.24360228020168 2428872.547825187 2.76390390848337 324.25181260235 36.6386929891229 79.3436760379819 2819811.75305035 T 27 CATAB v2.0f-lin.ifort 2020-Feb-22 22:20:53 2020-Feb-22 22:20
1948-Jul-31 11:10 00:02 Jupiter 1.66233609041176 1.66233567614091 1.6623365046829 3.0369025658988 2.86421058352572 2432763.965419651 1.97158143496445 195.081050097132 18.2343869680237 89.1072853189873 2551004.77459357 T 27 CATAB v2.0f-lin.ifort 2020-Feb-22 22:20:53 2020-Feb-22 22:20
1959-Apr-27 10:53 00:02 Jupiter 1.87197090676875 1.87196999895445 1.87197181458603 3.37639546891598 3.23961320424976 2436685.953539320 1.59081931330446 146.276503862145 18.0418965361995 74.313429093586 2817237.99840766 T 27 CATAB v2.0f-lin.ifort 2020-Feb-22 22:20:53 2020-Feb-22 22:20
2044-Nov-17 12:07 00:01 Jupiter 1.79516205468941 1.79516141004483 1.7951626993347 2.2386250594817 2.01687125890767 2467937.004965772 1.11824767718924 209.138105996931 31.0698688568589 83.8831986929713 2703270.71648946 T 27 CATAB v2.0f-lin.ifort 2020-Feb-22 22:20:53 2020-Feb-22 22:20
2055-Jul-01 12:21 00:01 Jupiter 1.66650690158375 1.66650645935076 1.66650734381692 2.93043338040605 2.75152963548608 2471815.014749735 1.34046454097998 145.514511642582 19.2417060693049 88.1647925922951 2399699.85363662 T 27 CATAB v2.0f-lin.ifort 2020-Feb-22 22:20:53 2020-Feb-22 22:20
2066-Mar-24 14:38 00:02 Jupiter 1.85106739287011 1.85106632201133 1.85106846373289 3.40412417912862 3.26693884788415 2475734.109814578 1.72428044336538 163.289535557138 18.4504476405212 73.4545569403767 2727722.89196112 T 27 CATAB v2.0f-lin.ifort 2020-Feb-22 22:20:53 2020-Feb-22 22:20
2151-Nov-04 09:33 00:05 Jupiter 1.80336720343562 1.80336557367805 1.8033688332545 2.05259217834318 1.80935231186095 2507003.898203311 5.14773754677933 621.895854046584 32.4339959623267 83.8152630814823 2327731.83428775 T 27 CATAB v2.0f-lin.ifort 2020-Feb-22 22:20:53 2020-Feb-22 22:20
2162-Jun-03 15:30 00:05 Jupiter 1.6677212827133 1.66772083312312 1.66772173230357 2.77964118159001 2.59048660232966 2510868.145634801 4.72055642576798 315.482953399145 26.0270244723751 -85.8007308620029 1789329.88696452 T 27 CATAB v2.0f-lin.ifort 2020-Feb-22 22:20:53 2020-Feb-22 22:20
2173-Feb-22 22:22 00:05 Jupiter 1.82688830483954 1.82688576970257 1.82689084001544 3.39611010620464 3.25672833533626 2514785.431857113 4.95315395269936 454.900667614596 17.991005141668 75.4931585049516 2677404.42620427 T 27 CATAB v2.0f-lin.ifort 2020-Feb-22 22:20:53 2020-Feb-22 22:20

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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