Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP

Significant website upgrade scheduled for September 27. More details available here.

JPL Small-Body Database Browser
Search: [ help ]  
43810 (1991 RJ20)
Classification: Main-belt Asteroid          SPK-ID: 2043810
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2288611857541548 3.6168e-08  
a 2.410130603294959 6.8633e-09 au
q 1.858545255602499 8.9217e-08 au
i 3.054512616696082 4.0376e-06 deg
node 131.7081334369398 6.3326e-05 deg
peri 229.4196860286004 6.3803e-05 deg
M 342.4513131370396 8.4437e-06 deg
tp 2459463.119507328488
(2021-Sep-05.61950733)
3.2209e-05 TDB
period 1366.656253287886
3.74
5.8377e-06
1.598e-08
d
yr
n .2634166412614116 1.1252e-09 deg/d
Q 2.961715950987421 8.434e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1122  
   data-arc span      10921 days (29.90 yr)  
   first obs. used      1991-09-14  
   last obs. used      2021-08-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51399  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 00:47:10  

Additional Information
 Earth MOID = .856371 au 
 Jupiter MOID = 2.49444 au 
 T_jup = 3.482 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457134.5 (2015-Apr-22.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2271886841220724 3.5993e-08  
q 1.863473847604687 8.8497e-08 au
tp 2456729.324580068194
(2014-Mar-12.82458007)
2.8471e-05 TDB
node 131.7379544381772 6.3252e-05 deg
peri 229.3498670859989 6.3748e-05 deg
i 3.054167510380251 4.0393e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1122  
   data-arc span      10921 days (29.90 yr)  
   first obs. used      1991-09-14  
   last obs. used      2021-08-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51399  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 00:47:10  

Additional Information
 Jupiter MOID = 2.49444 au 
 T_jup = 3.482 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.295530969431043E-15 -3.180384316614852E-15 -3.11238158248688E-13 8.941059174995157E-15 -8.163866851134434E-14 -9.642640475750817E-17
q -3.180384316614852E-15 7.831649208576197E-15 7.800257537187766E-13 -2.243043282408751E-14 2.064264498921293E-13 2.853495581496133E-16
tp -3.11238158248688E-13 7.800257537187766E-13 8.106198213772659E-10 -9.625877157865854E-12 2.35529872575321E-10 2.724150036238356E-15
node 8.941059174995157E-15 -2.243043282408751E-14 -9.625877157865854E-12 4.000811922173844E-9 -3.997325699902395E-9 5.174700489732392E-11
peri -8.163866851134434E-14 2.064264498921293E-13 2.35529872575321E-10 -3.997325699902395E-9 4.063755501174712E-9 -5.167022321695895E-11
i -9.642640475750817E-17 2.853495581496133E-16 2.724150036238356E-15 5.174700489732392E-11 -5.167022321695895E-11 1.631607439519604E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.52   n/a MPO636691  

43810 (1991 RJ20)          Discovered 1991-Sep-14 by Holt, H. E. at Palomar
Reference: 20020822/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1991 RJ20 = 1995 XZ4 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Sep-18 19:29 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin