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4072 Yayoi (1981 UJ4)
Classification: Main-belt Asteroid          SPK-ID: 2004072
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06451352426172402 3.7787e-08  
a 2.144953341317946 5.7521e-09 au
q 2.006574841892565 8.111e-08 au
i 2.161130607379121 3.3777e-06 deg
node 21.29298987365791 9.6069e-05 deg
peri 126.1251248751812 9.9124e-05 deg
M 7.664767528394944 2.3321e-05 deg
tp 2458976.070100090134
(2020-May-06.57010009)
7.4339e-05 TDB
period 1147.427359664933
3.14
4.6155e-06
1.264e-08
d
yr
n .3137453512570292 1.262e-09 deg/d
Q 2.283331840743327 6.1231e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2878  
   data-arc span      17327 days (47.44 yr)  
   first obs. used      1972-12-30  
   last obs. used      2020-06-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42811  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 16:05:09  

Additional Information
 Earth MOID = 1.0186 au 
 Jupiter MOID = 2.69962 au 
 T_jup = 3.706 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.4   n/a MPO347555  
diameter diameter 4.694 km 0.161 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 4.006 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Pravec, P.; Wolf, M.; Sarounova, L. (2017) http://www.asu.cas.cz/~ppravec/neo.htm]
geometric albedo albedo 0.384   0.041 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
SMASSII spectral type spec_B S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

4072 Yayoi (1981 UJ4)          Discovered 1981-Oct-30 by Kosai and Hurukawa at Kiso
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1981 UJ4 = 1972 YW = 1975 XS5 = 1983 JO = 1984 UU2 = 1984 WK1 = 1987 SL6 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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