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1885 Herero (1948 PJ)
Classification: Main-belt Asteroid          SPK-ID: 2001885
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .248049907632145 3.9848e-08  
a 2.249966590632305 4.6472e-09 au
q 1.69186258565055 8.8941e-08 au
i 5.666177078063095 4.0794e-06 deg
node 326.3524024005498 3.6466e-05 deg
peri 5.564501157208944 3.7119e-05 deg
M 93.12860328277817 6.9017e-06 deg
tp 2458681.608370459495
(2019-Jul-17.10837046)
2.3456e-05 TDB
period 1232.714575198738
3.37
3.8192e-06
1.046e-08
d
yr
n .292038406329349 9.0479e-10 deg/d
Q 2.808070595614061 5.8e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2443  
   data-arc span      26339 days (72.11 yr)  
   first obs. used      1948-08-09  
   last obs. used      2020-09-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45189  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Oct-22 15:36:33  

Additional Information
 Earth MOID = .681378 au 
 Jupiter MOID = 2.56166 au 
 T_jup = 3.580 
[ show covariance matrix ]

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 13.7   n/a PDS3 (MPC 17263)  
diameter diameter 4.657 km 0.052 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 7.609 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Chang, C.K.; Ip, W.-H.; Lin, H.-W.; Cheng, Y.C.; et al. (2015) Astrophys. J. Supp. Ser. 219, A27.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.255   0.040 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

1885 Herero (1948 PJ)          Discovered 1948-Aug-09 by Johnson, E. L. at Johannesburg (UO)
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1948 PJ = 1965 SH = 1975 RL2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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