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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 ]

[ 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 
[ 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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1960-Feb-05 01:39 00:01 Jupiter 1.97682317055866 1.97682254274106 1.97682379837604 2.70711951186383 2.5439227210815 2436969.568809386 1.1617701488547 13.6809625727437 4.45841207492335 8.13469452903707 1945009.9701377 T 38 CATAB v2.0f-lin.ifort 2021-Apr-12 11:47:28 2021-Apr-12 11:47
1970-Aug-17 08:18 < 00:01 Jupiter 1.67241694313975 1.67241657881809 1.67241730746112 1.2827490071671 0.795306724636422 2440815.845769181 0.903306157611885 225.652452006225 69.1858506863734 -13.4916143926682 2881019.43957782 T 38 CATAB v2.0f-lin.ifort 2021-Apr-12 11:47:28 2021-Apr-12 11:47
1981-Mar-19 02:19 < 00:01 Jupiter 1.61600683936881 1.61600663683074 1.61600704191377 1.10904341940151 0.426247059507315 2444682.596181911 0.628994447129413 1153.84198913686 144.845430657524 -16.3670427215431 7170532.26254997 T 38 CATAB v2.0f-lin.ifort 2021-Apr-12 11:47:28 2021-Apr-12 11:47
1991-Oct-06 23:50 < 00:01 Jupiter 1.86088424982749 1.86088401774731 1.86088448190767 2.08792111009337 1.85716731845278 2448536.493212561 0.41429259541184 26.9921577038218 4.94362984641243 -83.891458020558 5218613.48312702 T 38 CATAB v2.0f-lin.ifort 2021-Apr-12 11:47:28 2021-Apr-12 11:47
2066-Mar-05 06:34 < 00:01 Jupiter 1.76788343039241 1.76788307777178 1.76788378301273 1.67357859626448 1.35743577276257 2475714.773686383 0.892538017762032 44.812591040426 20.492281058366 -14.6690660982505 2568994.77127264 T 38 CATAB v2.0f-lin.ifort 2021-Apr-12 11:47:28 2021-Apr-12 11:47
2076-Sep-26 22:29 00:01 Jupiter 1.59959232540344 1.59959213357582 1.59959251723188 1.04409006482086 0.17628409654961 2479573.436924528 1.09578969980445 15130.5217178508 424.117949325347 -0.934386388628702 3429229.33585575 T 38 CATAB v2.0f-lin.ifort 2021-Apr-12 11:47:28 2021-Apr-12 11:47
2087-Apr-24 22:46 00:01 Jupiter 1.75238130118084 1.75238073684318 1.75238186552119 1.58396696425582 1.24186998579238 2483435.448669462 1.39456365197637 160.390270385328 22.6620728684497 -64.6152598725368 5986289.10324605 T 38 CATAB v2.0f-lin.ifort 2021-Apr-12 11:47:28 2021-Apr-12 11:47
2161-Sep-23 03:31 00:03 Jupiter 1.88153267500238 1.88153145998251 1.88153389002086 2.25891347277843 2.04996007656303 2510614.646364360 2.71247946192633 7.27296398837654 4.04322566093492 -33.9170207706437 830253.456733068 T 38 CATAB v2.0f-lin.ifort 2021-Apr-12 11:47:28 2021-Apr-12 11:47
2172-Apr-06 03:02 00:03 Jupiter 1.62145194919438 1.6214513896443 1.62145250874989 1.11457282682524 0.444412166258994 2514462.626693620 2.82972477654007 2183.71534227093 197.89276335907 -9.01365462592993 2622223.78080295 T 38 CATAB v2.0f-lin.ifort 2021-Apr-12 11:47:28 2021-Apr-12 11:47
2182-Nov-05 17:41 00:03 Jupiter 1.66358587015822 1.66358496513636 1.6635867752247 1.24769979256614 0.73378841412644 2518328.236553245 3.08931027143967 900.365945365208 86.698905933361 -44.2351230212794 5825630.16979191 T 38 CATAB v2.0f-lin.ifort 2021-Apr-12 11:47:28 2021-Apr-12 11:47
2193-May-23 00:46 00:03 Jupiter 1.96426690987542 1.96426526328206 1.96426855646923 2.52858297212939 2.35187173764489 2522179.531954276 3.40798110036443 109.10458405511 4.87739342828303 76.3854759044594 3800452.91609984 T 38 CATAB v2.0f-lin.ifort 2021-Apr-12 11:47:28 2021-Apr-12 11:47

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