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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 ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 62 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4821505407809041 3.9172e-08  
a 3.233588113854446 1.3418e-08 au
q 1.674511856096821 1.2311e-07 au
i 35.44660685500262 4.5047e-06 deg
node 226.5246879939273 6.4755e-06 deg
peri 31.43952630844914 9.1069e-06 deg
M 65.07805573528594 8.4567e-06 deg
tp 2458816.565140970476
(2019-Nov-29.06514097)
4.7701e-05 TDB
period 2123.857999274652
5.81
1.322e-05
3.619e-08
d
yr
n .1695028575935625 1.055e-09 deg/d
Q 4.792664371612072 1.9887e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2500  
   data-arc span      26201 days (71.73 yr)  
   first obs. used      1949-04-25  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39312  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:59:09  

Additional Information
 Earth MOID = .711004 au 
 Jupiter MOID = .633953 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 12.42   n/a E2021B10  
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. 2020-October); 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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