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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 64 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4821505645113989 2.6142e-08  
a 3.233588134914609 8.4258e-09 au
q 1.674511790268169 8.247e-08 au
i 35.44660586700902 1.4594e-06 deg
node 226.524681210443 1.4902e-06 deg
peri 31.43954758787062 1.7749e-06 deg
M 65.07803944836327 3.4336e-06 deg
tp 2458816.565233306080
(2019-Nov-29.06523331)		 1.9007e-05 TDB
period 2123.858020023489
5.81		 8.3012e-06
2.273e-08		 d
yr
n .1695028559376199 6.6251e-10 deg/d
Q 4.792664479561049 1.2488e-08 au
   Orbit Determination Parameters
   # obs. used (total)      2557  
   data-arc span      26226 days (71.80 yr)  
   first obs. used      1949-04-25  
   last obs. used      2021-02-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .39582  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 13:06:47  

Additional Information
 Earth MOID = .711004 au 
 Jupiter MOID = .633954 au 
 T_jup = 2.734 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457768.5 (2017-Jan-15.0) TDB
Reference: JPL 64 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4815735465046024 2.6144e-08  
q 1.677673175982351 8.2437e-08 au
tp 2458816.942411673622
(2019-Nov-29.44241167)		 1.8995e-05 TDB
node 226.5290577696818 1.4895e-06 deg
peri 31.39605111815248 1.7797e-06 deg
i 35.44541554185476 1.4599e-06 deg
   Orbit Determination Parameters
   # obs. used (total)      2557  
   data-arc span      26226 days (71.80 yr)  
   first obs. used      1949-04-25  
   last obs. used      2021-02-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .39582  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 13:06:47  

Additional Information
 Jupiter MOID = .633954 au 
 T_jup = 2.734 
Orbit Covariance (6×6)
  e q tp node peri i
e 6.835343000765978E-16 -2.152958905655856E-15 3.586363178673768E-13 5.703298310098271E-15 -2.836333904466182E-14 -4.273535851012612E-15
q -2.152958905655856E-15 6.795887622401806E-15 -1.090820541902685E-12 -1.704492062882172E-14 9.096090398544333E-14 1.2058307412389E-14
tp 3.586363178673768E-13 -1.090820541902685E-12 3.608072747204866E-10 1.15471319182245E-11 -5.345505602054109E-12 -1.539555260218814E-11
node 5.703298310098271E-15 -1.704492062882172E-14 1.15471319182245E-11 2.218536975675916E-12 -8.843720320282705E-13 -1.537677784538572E-12
peri -2.836333904466182E-14 9.096090398544333E-14 -5.345505602054109E-12 -8.843720320282705E-13 3.167321713582332E-12 7.43099158469791E-14
i -4.273535851012612E-15 1.2058307412389E-14 -1.539555260218814E-11 -1.537677784538572E-12 7.43099158469791E-14 2.131167680432088E-12

[ 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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