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21078 (1991 RR16)
Classification: Outer Main-belt Asteroid          SPK-ID: 2021078
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08875237341120705 4.4916e-08  
a 3.394719110174021 2.6813e-08 au
q 3.093429732081696 1.5946e-07 au
i 8.077975951162689 6.2177e-06 deg
node 23.47018693777654 3.2368e-05 deg
peri 282.7000153800696 5.0372e-05 deg
M 317.4500543367058 4.1739e-05 deg
tp 2459666.522966230453
(2022-Mar-28.02296623)
0.00026601 TDB
period 2284.568554145535
6.25
2.7067e-05
7.411e-08
d
yr
n .1575789876590706 1.8669e-09 deg/d
Q 3.696008488266346 2.9192e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1652  
   data-arc span      13077 days (35.80 yr)  
   first obs. used      1985-10-18  
   last obs. used      2021-08-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46351  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:40:16  

Additional Information
 Earth MOID = 2.09221 au 
 Jupiter MOID = 1.58694 au 
 T_jup = 3.126 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457109.5 (2015-Mar-28.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08684018606143422 4.4911e-08  
q 3.102425537515664 1.5932e-07 au
tp 2457378.808873742845
(2015-Dec-22.30887374)
0.0002625 TDB
node 23.50807902879227 3.2368e-05 deg
peri 282.5747435542092 5.0982e-05 deg
i 8.076013894388419 6.2153e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1652  
   data-arc span      13077 days (35.80 yr)  
   first obs. used      1985-10-18  
   last obs. used      2021-08-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46351  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:40:16  

Additional Information
 Jupiter MOID = 1.58694 au 
 T_jup = 3.126 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.016979225859145E-15 -7.072189561615392E-15 2.632366125185016E-12 -1.033206719386208E-16 4.486908417096912E-13 1.349671697063717E-15
q -7.072189561615392E-15 2.538308584080507E-14 -7.190165540630959E-12 -4.336677556002523E-17 -1.280332980444123E-12 -3.860711919181547E-15
tp 2.632366125185016E-12 -7.190165540630959E-12 6.890631754067329E-8 3.060351914274631E-12 1.036144999713294E-8 8.979098951851992E-12
node -1.033206719386208E-16 -4.336677556002523E-17 3.060351914274631E-12 1.047719127684979E-9 -1.036545916108318E-9 -5.580496569193183E-11
peri 4.486908417096912E-13 -1.280332980444123E-12 1.036144999713294E-8 -1.036545916108318E-9 2.59920415013168E-9 5.665738634759412E-11
i 1.349671697063717E-15 -3.860711919181547E-15 8.979098951851992E-12 -5.580496569193183E-11 5.665738634759412E-11 3.863045512542595E-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 12.69   n/a MPO636381  
diameter diameter 14.807 km 0.167 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.067   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21078 (1991 RR16)          Discovered 1991-Sep-15 by Holt, H. E. at Palomar
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1991 RR16 = 1985 UC6 = 1998 WF20 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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