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5999 Plescia (1987 HA)
Classification: Mars-crossing Asteroid          SPK-ID: 2005999
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3060282515924074 6.6671e-08  
a 2.279347812061579 8.2718e-09 au
q 1.581802986365395 1.4958e-07 au
i 23.17172752608301 6.373e-06 deg
node 71.13070521684348 1.8737e-05 deg
peri 71.44645041096197 2.6287e-05 deg
M 250.414894643176 1.1664e-05 deg
tp 2459383.116201881471
(2021-Jun-17.61620188)
4.0822e-05 TDB
period 1256.939364422048
3.44
6.8422e-06
1.873e-08
d
yr
n .2864099973235631 1.5591e-09 deg/d
Q 2.976892637757763 1.0803e-08 au
  Orbit Determination Parameters
   # obs. used (total)      964  
   data-arc span      12152 days (33.27 yr)  
   first obs. used      1987-04-23  
   last obs. used      2020-07-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4386  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 23:34:56  

Additional Information
 Earth MOID = .729949 au 
 Jupiter MOID = 2.49465 au 
 T_jup = 3.441 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456626.5 (2013-Nov-30.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3054420713045606 6.6618e-08  
q 1.583493164987373 1.4945e-07 au
tp 2456868.073753890409
(2014-Jul-29.57375389)
4.2686e-05 TDB
node 71.16634897902922 1.8728e-05 deg
peri 71.46230285685455 2.6316e-05 deg
i 23.17465351618445 6.3748e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      964  
   data-arc span      12152 days (33.27 yr)  
   first obs. used      1987-04-23  
   last obs. used      2020-07-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4386  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 23:34:56  

Additional Information
 Jupiter MOID = 2.49465 au 
 T_jup = 3.441 
Orbit Covariance (6×6)
  e q tp node peri i
e 4.437893173470237E-15 -9.94945768183178E-15 3.285032058310014E-13 4.528379848211653E-14 -9.527584778543351E-14 -9.852652020092719E-14
q -9.94945768183178E-15 2.233385552722888E-14 -8.198511054804248E-13 -9.851749662477104E-14 1.723775437663811E-13 2.216194161022292E-13
tp 3.285032058310014E-13 -8.198511054804248E-13 1.822064690883533E-9 -9.169098371083556E-12 8.081357605841515E-10 -3.538577178344711E-11
node 4.528379848211653E-14 -9.851749662477104E-14 -9.169098371083556E-12 3.507301558231102E-10 -3.298786338172514E-10 -2.8071373736113E-11
peri -9.527584778543351E-14 1.723775437663811E-13 8.081357605841515E-10 -3.298786338172514E-10 6.925358794132263E-10 1.597710080490638E-11
i -9.852652020092719E-14 2.216194161022292E-13 -3.538577178344711E-11 -2.8071373736113E-11 1.597710080490638E-11 4.063851815564401E-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 14.5   n/a MPO435756  
diameter diameter 7.078 km 1.897 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)  
rotation period rot_per 5.392 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Pravec, P.; Wolf, M.; Sarounova, L. (2011) http://www.asu.cas.cz/~ppravec/neo.htm]
[Warner, B.D. (2018) Minor Planet Bull. 45, 380-386.]
[Skiff, B.A.; McLelland, K.P.; Sanborn, J.; Pravec, P.; Koehn, B.W. (2019). Minor Planet Bull. 46-4, in press.]
geometric albedo albedo 0.067   0.047 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)  

5999 Plescia (1987 HA)          Discovered 1987-Apr-23 by Shoemaker, C. S. at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1987 HA = 1989 XQ 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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