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1922 Zulu (1949 HC)
Classification: Outer Main-belt Asteroid          SPK-ID: 2001922
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 55 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4822781977479063 4.3529e-08  
a 3.234186989349781 1.7385e-08 au
q 1.674409116946441 1.4006e-07 au
i 35.44657808864392 6.0623e-06 deg
node 226.5249642739502 8.4131e-06 deg
peri 31.44568529468043 1.01e-05 deg
M 31.16139529656882 9.8963e-06 deg
tp 2458816.608984874919
(2019-Nov-29.10898488)
5.7008e-05 TDB
period 2124.448049099985
5.82
1.713e-05
4.69e-08
d
yr
n .1694557794211596 1.3664e-09 deg/d
Q 4.793964861753119 2.577e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1730  
   data-arc span      25987 days (71.15 yr)  
   first obs. used      1949-04-25  
   last obs. used      2020-06-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43591  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:38:36  

Additional Information
 Earth MOID = .712207 au 
 Jupiter MOID = .63417 au 
 T_jup = 2.734 
[ 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 12.4   n/a MPO473790  
diameter diameter 20.561 km 0.321 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 18.64 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Behrend, R. (2002) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Stephens, R.D. (2002) Minor Planet Bull. 29, 72-73.]
geometric albedo albedo 0.055   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

1922 Zulu (1949 HC)          Discovered 1949-Apr-25 by Johnson, E. L. at Johannesburg (UO)
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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