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21247 (1995 YJ1)
Classification: Main-belt Asteroid          SPK-ID: 2021247
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 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08535767897628413 3.3786e-08  
a 2.894652248095045 1.1812e-08 au
q 2.647571450754169 9.7025e-08 au
i 2.963742161417666 3.3142e-06 deg
node 128.6504465439467 6.2114e-05 deg
peri 236.5133609008977 6.4935e-05 deg
M 157.839631506962 1.9206e-05 deg
tp 2458607.809554506233
(2019-May-04.30955451)
9.5583e-05 TDB
period 1798.842012408225
4.92
1.101e-05
3.014e-08
d
yr
n .2001287481150415 1.2249e-09 deg/d
Q 3.141733045435921 1.282e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2418  
   data-arc span      16181 days (44.30 yr)  
   first obs. used      1977-02-19  
   last obs. used      2021-06-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47382  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 05:06:30  

Additional Information
 Earth MOID = 1.64598 au 
 Jupiter MOID = 2.28538 au 
 T_jup = 3.282 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457383.5 (2015-Dec-27.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08482281495365812 3.4018e-08  
q 2.648998525180744 9.7559e-08 au
tp 2456795.935711986653
(2014-May-18.43571199)
9.5755e-05 TDB
node 128.7749467136914 6.198e-05 deg
peri 234.0411414190914 6.4832e-05 deg
i 2.965430958511338 3.3195e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2418  
   data-arc span      16181 days (44.30 yr)  
   first obs. used      1977-02-19  
   last obs. used      2021-06-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47382  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 05:06:30  

Additional Information
 Jupiter MOID = 2.28538 au 
 T_jup = 3.282 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.15719576331122E-15 -3.298829961838569E-15 6.508219501793828E-14 -4.826934722483855E-15 -2.478634258411276E-14 -4.731237104916968E-16
q -3.298829961838569E-15 9.517685648914177E-15 -1.978096244526965E-13 1.360373140238745E-14 7.579159782164725E-14 1.397734038922541E-15
tp 6.508219501793828E-14 -1.978096244526965E-13 9.169006500938254E-9 1.913835014832088E-12 1.829854660039177E-9 -1.39894005782377E-12
node -4.826934722483855E-15 1.360373140238745E-14 1.913835014832088E-12 3.841522320569428E-9 -3.835596341714653E-9 4.605130242670174E-12
peri -2.478634258411276E-14 7.579159782164725E-14 1.829854660039177E-9 -3.835596341714653E-9 4.203132491809781E-9 -4.86092883772048E-12
i -4.731237104916968E-16 1.397734038922541E-15 -1.39894005782377E-12 4.605130242670174E-12 -4.86092883772048E-12 1.101926906120444E-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 13.60   n/a MPO636383  
diameter diameter 4.799 km 0.097 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.367   0.018 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21247 (1995 YJ1)          Discovered 1995-Dec-21 by Kobayashi, T. at Oizumi
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1995 YJ1 = 1977 DV9 = 1994 RJ4 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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