Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
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 ]

[ show orbit diagram ]
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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456671.5 (2014-Jan-14.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2352079312410313 1.9722e-08  
q 2.403911464487514 6.4361e-08 au
tp 2456058.578577770064
(2012-May-11.07857777)
2.5808e-05 TDB
node 41.74327178569744 2.0238e-05 deg
peri 337.5227351780641 1.9775e-05 deg
i 1.574826776510254 1.592e-06 deg
  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
 Jupiter MOID = 1.5799 au 
 T_jup = 3.166 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.889711778153947E-16 -1.258237184639691E-15 -6.087987240241327E-14 6.818266011695055E-14 -6.803777944931149E-14 -1.0015102059073E-14
q -1.258237184639691E-15 4.142357747986708E-15 2.224193120627793E-13 -2.060385019815924E-13 2.147873754382092E-13 3.061190466733457E-14
tp -6.087987240241327E-14 2.224193120627793E-13 6.660559626315924E-10 7.698126312232169E-11 9.13884879486859E-12 -1.204350733235457E-12
node 6.818266011695055E-14 -2.060385019815924E-13 7.698126312232169E-11 4.095738378511612E-10 -3.940465025262016E-10 1.758930472701173E-11
peri -6.803777944931149E-14 2.147873754382092E-13 9.13884879486859E-12 -3.940465025262016E-10 3.910474073662276E-10 -1.74661996087114E-11
i -1.0015102059073E-14 3.061190466733457E-14 -1.204350733235457E-12 1.758930472701173E-11 -1.74661996087114E-11 2.534485518275596E-12

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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Apr-23 05:14 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin