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385518 (2004 HP54)
Classification: Outer Main-belt Asteroid          SPK-ID: 2385518
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1730921978232382 5.8658e-08  
a 3.218790581389835 4.9159e-08 au
q 2.66164304532433 1.9542e-07 au
i 15.39423749575623 6.3132e-06 deg
node 67.05615706603059 2.8188e-05 deg
peri 200.3972476706885 4.1136e-05 deg
M 310.407730879227 3.7276e-05 deg
tp 2459687.068806135667
(2022-Apr-17.56880614)
0.00022291 TDB
period 2109.295905660094
5.77
4.8321e-05
1.323e-07
d
yr
n .1706730663222615 3.9099e-09 deg/d
Q 3.775938117455341 5.7668e-08 au
  Orbit Determination Parameters
   # obs. used (total)      239  
   data-arc span      6266 days (17.16 yr)  
   first obs. used      2004-03-23  
   last obs. used      2021-05-19  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .60863  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-09 07:11:30  

Additional Information
 Earth MOID = 1.65165 au 
 Jupiter MOID = 1.32271 au 
 T_jup = 3.110 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457782.5 (2017-Jan-29.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1728091074711892 5.8744e-08  
q 2.663059774638089 1.9577e-07 au
tp 2457573.424654770861
(2016-Jul-03.92465477)
0.00019326 TDB
node 67.08700526137505 2.8182e-05 deg
peri 199.9275860948003 4.1154e-05 deg
i 15.3949250984072 6.3134e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      239  
   data-arc span      6266 days (17.16 yr)  
   first obs. used      2004-03-23  
   last obs. used      2021-05-19  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .60863  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-09 07:11:30  

Additional Information
 Jupiter MOID = 1.32271 au 
 T_jup = 3.110 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.450820342522983E-15 -1.125401675855508E-14 -2.124095800815683E-12 -5.616090157833844E-15 -2.278561564399072E-13 2.972581906518551E-15
q -1.125401675855508E-14 3.832467083385389E-14 1.105539150815361E-11 -1.349529017041155E-14 1.422569909597766E-12 3.02649744065754E-15
tp -2.124095800815683E-12 1.105539150815361E-11 3.734886229366903E-8 -9.85050963786756E-12 5.881662472261344E-9 3.401752486346775E-11
node -5.616090157833844E-15 -1.349529017041155E-14 -9.85050963786756E-12 7.942459376714191E-10 -7.691683668619511E-10 -1.347653163052183E-11
peri -2.278561564399072E-13 1.422569909597766E-12 5.881662472261344E-9 -7.691683668619511E-10 1.693617702305933E-9 1.8995113419047E-11
i 2.972581906518551E-15 3.02649744065754E-15 3.401752486346775E-11 -1.347653163052183E-11 1.8995113419047E-11 3.985921063566556E-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 15.57   n/a MPCxxxxx  
diameter diameter 4.449 km 0.113 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.062   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

385518 (2004 HP54)          Discovered 2004-Apr-21 by CSS at Catalina
Reference: Last Updated: 2014-02-19

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