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5507 Niijima (1987 UJ)
Classification: Main-belt Asteroid          SPK-ID: 2005507
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 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1344581691617416 1.945e-08  
a 2.579241534266154 7.4213e-09 au
q 2.232441439742806 5.0741e-08 au
i 2.643574976745577 4.367e-07 deg
node 337.455034919722 2.0686e-05 deg
peri 21.59232416857586 2.4155e-05 deg
M 25.67062179498559 6.632e-06 deg
tp 2459092.612697392171
(2020-Aug-31.11269739)
2.7883e-05 TDB
period 1512.991358331846
4.14
6.53e-06
1.788e-08
d
yr
n .2379392307943644 1.0269e-09 deg/d
Q 2.926041628789503 8.4191e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2413  
   data-arc span      13635 days (37.33 yr)  
   first obs. used      1983-11-07  
   last obs. used      2021-03-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46872  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 17:37:53  

Additional Information
 Earth MOID = 1.22728 au 
 Jupiter MOID = 2.5168 au 
 T_jup = 3.411 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457325.5 (2015-Oct-30.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1362973512776169 1.9605e-08  
q 2.227597824160902 5.1307e-08 au
tp 2457580.668618990469
(2016-Jul-11.16861899)
2.8338e-05 TDB
node 337.5897080204837 2.0692e-05 deg
peri 21.83099034394469 2.4095e-05 deg
i 2.643595863705312 4.3659e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2413  
   data-arc span      13635 days (37.33 yr)  
   first obs. used      1983-11-07  
   last obs. used      2021-03-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46872  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 17:37:53  

Additional Information
 Jupiter MOID = 2.5168 au 
 T_jup = 3.411 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.84360288394279E-16 -9.979497430864029E-16 2.736730679205103E-13 4.349660769350151E-14 5.274955335381622E-14 2.246614944521829E-15
q -9.979497430864029E-16 2.63241032534108E-15 -7.551347706912942E-13 -1.050313124069556E-13 -1.573009747523369E-13 -5.882566245115916E-15
tp 2.736730679205103E-13 -7.551347706912942E-13 8.03022266908027E-10 -2.18743342581998E-10 4.304296335804039E-10 1.637194559158355E-12
node 4.349660769350151E-14 -1.050313124069556E-13 -2.18743342581998E-10 4.281595995474678E-10 -4.751399504074339E-10 -3.933305093425028E-13
peri 5.274955335381622E-14 -1.573009747523369E-13 4.304296335804039E-10 -4.751399504074339E-10 5.805759181025169E-10 8.299874966929534E-13
i 2.246614944521829E-15 -5.882566245115916E-15 1.637194559158355E-12 -3.933305093425028E-13 8.299874966929534E-13 1.90608158319687E-13

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 13.75   n/a E2021B10  
diameter diameter 5.522 km 0.381 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.231   0.047 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

5507 Niijima (1987 UJ)          Discovered 1987-Oct-21 by Suzuki and Urata at Toyota
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ 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
2042-Jul-09 05:43 < 00:01 David 0.0470882721745149 0.0470868446493243 0.0470896999132214 6.19253023531065 6.19253018350201 2467074.737880252 0.508603373020328 181.680625342377 23.1640665816898 -68.0730954787236 282368.425808807 T 34 CATAB v2.0f-lin.ifort 2021-Apr-12 17:38:44 2021-Apr-12 17:38

Alternate Designations
 1987 UJ = 1983 VN1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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