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988 Appella (A922 VC)
Classification: Main-belt Asteroid          SPK-ID: 2000988
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2365732277787623 1.9654e-08  
a 3.140370138025468 1.1395e-08 au
q 2.397442638052746 6.3983e-08 au
i 1.574937325638844 1.5926e-06 deg
node 41.70105406727538 2.024e-05 deg
peri 337.0660743864354 1.9768e-05 deg
M 196.5127078592046 5.7832e-06 deg
tp 2460123.605173980010
(2023-Jun-28.10517398)
3.6038e-05 TDB
period 2032.683141798026
5.57
1.1063e-05
3.029e-08
d
yr
n .1771058128034452 9.6394e-10 deg/d
Q 3.88329763799819 1.409e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3393  
   data-arc span      29700 days (81.31 yr)  
   first obs. used      1939-11-22  
   last obs. used      2021-03-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42934  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 11:46:33  

Additional Information
 Earth MOID = 1.39843 au 
 Jupiter MOID = 1.5799 au 
 T_jup = 3.166 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 11.68   n/a E2021B10  
diameter diameter 20.431 km 0.215 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 120. h n/a LCDB (Rev. 2020-October); Warner et al., 2009 lower-limit; Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Stephens, Robert D. (2013) Minor Planet Bull. 40, 92.]
geometric albedo albedo 0.097   0.021 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

988 Appella (A922 VC)          Discovered 1922-Nov-10 by Jekhovsky, B. at Algiers
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A922 VC = 1955 QJ1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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