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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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Orbit Diagram
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Note: This Java-based orbit viewer will eventually be retired.

Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet 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. For accurate long-term ephemerides, please instead use our Horizons system.

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Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).


Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2170441508191562 3.8338e-08  
a 2.612906045339543 6.7475e-09 au
q 2.045790071558582 1.014e-07 au
i 9.755412180268046 3.5772e-06 deg
node 214.9484841536531 2.2433e-05 deg
peri 127.6800356257992 2.3499e-05 deg
M 319.3955538549885 7.5365e-06 deg
tp 2459174.502387618200
(2020-Nov-21.00238762)
3.2519e-05 TDB
period 1542.709370270467
4.22
5.9758e-06
1.636e-08
d
yr
n .2333556837973214 9.0391e-10 deg/d
Q 3.180022019120504 8.212e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2907  
   data-arc span      35511 days (97.22 yr)  
   first obs. used      1923-08-09  
   last obs. used      2020-10-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41592  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:23:34  

Additional Information
 Earth MOID = 1.05577 au 
 Jupiter MOID = 2.33355 au 
 T_jup = 3.355 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456854.5 (2014-Jul-16.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2164356766894426 3.8259e-08  
q 2.046693908347555 1.0103e-07 au
tp 2456093.191287233978
(2012-Jun-14.69128723)
3.1247e-05 TDB
node 214.989684254499 2.2423e-05 deg
peri 128.0662099266529 2.35e-05 deg
i 9.757607153097819 3.578e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2907  
   data-arc span      35511 days (97.22 yr)  
   first obs. used      1923-08-09  
   last obs. used      2020-10-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41592  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:23:34  

Additional Information
 Jupiter MOID = 2.33355 au 
 T_jup = 3.355 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.463756571949721E-15 -3.860077257703407E-15 -1.373892606740855E-13 8.921348259072916E-15 -1.622001146636213E-14 -3.990450610133431E-15
q -3.860077257703407E-15 1.020634047498984E-14 3.448160180853743E-13 -2.448109791644999E-14 4.229476672603998E-14 1.078393037723554E-14
tp -1.373892606740855E-13 3.448160180853743E-13 9.763804768645745E-10 -8.751859512820998E-13 2.346501393675421E-10 1.146115739907442E-12
node 8.921348259072916E-15 -2.448109791644999E-14 -8.751859512820998E-13 5.027974063129612E-10 -4.956447912608483E-10 -1.645423761984361E-11
peri -1.622001146636213E-14 4.229476672603998E-14 2.346501393675421E-10 -4.956447912608483E-10 5.522641310319491E-10 1.658327275616615E-11
i -3.990450610133431E-15 1.078393037723554E-14 1.146115739907442E-12 -1.645423761984361E-11 1.658327275616615E-11 1.280234942725135E-11

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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