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999 Zachia (A923 PE)
Classification: Main-belt Asteroid          SPK-ID: 2000999
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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2170441524263025 3.8669e-08  
a 2.612906045733266 6.9534e-09 au
q 2.045790067667528 1.021e-07 au
i 9.755412001205663 3.7403e-06 deg
node 214.9484838225855 2.2467e-05 deg
peri 127.6800363044739 2.3576e-05 deg
M 319.3955532690057 7.9254e-06 deg
tp 2459174.502390168643
(2020-Nov-21.00239017)
3.4227e-05 TDB
period 1542.70937061916
4.22
6.1582e-06
1.686e-08
d
yr
n .2333556837445769 9.315e-10 deg/d
Q 3.180022023799005 8.4626e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2704  
   data-arc span      35421 days (96.98 yr)  
   first obs. used      1923-08-09  
   last obs. used      2020-07-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42926  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:26:11  

Additional Information
 Earth MOID = 1.05577 au 
 Jupiter MOID = 2.33355 au 
 T_jup = 3.355 
[ 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 10.9   n/a MPO473776  
diameter diameter 16.848 km 0.182 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 22.837 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Warner, B.D. (2000) Minor Planet Bull. 27, 4-6.]
[Brines, P.; Lozano, J.; Rodrigo, O.; Fornas, A.; et al. (2017) Minor Planet Bull. 44, 145-149.]
geometric albedo albedo 0.226   0.033 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

999 Zachia (A923 PE)          Discovered 1923-Aug-09 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A923 PE = 1939 HA = 1940 RH = 1957 SH = 1972 CG = A915 VC 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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