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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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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2365732260036051 1.9655e-08  
a 3.140370129285966 1.1413e-08 au
q 2.397442636955426 6.3983e-08 au
i 1.574937312411401 1.5933e-06 deg
node 41.70105333401326 2.0247e-05 deg
peri 337.0660765496788 1.9774e-05 deg
M 196.512707455358 5.7854e-06 deg
tp 2460123.605172406829
(2023-Jun-28.10517241)
3.6058e-05 TDB
period 2032.683133312733
5.57
1.1081e-05
3.034e-08
d
yr
n .1771058135427609 9.6546e-10 deg/d
Q 3.883297621616505 1.4113e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3387  
   data-arc span      29690 days (81.29 yr)  
   first obs. used      1939-11-22  
   last obs. used      2021-03-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42959  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Mar-16 12:00:21  

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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