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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 ]

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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3060282085807606 4.5052e-08  
a 2.279347807382112 6.3893e-09 au
q 1.58180308115648 1.0306e-07 au
i 23.17172792361394 6.0181e-06 deg
node 71.13070039835921 1.4424e-05 deg
peri 71.4464646677407 1.8986e-05 deg
M 250.4148923902284 1.1153e-05 deg
tp 2459383.116208569376
(2021-Jun-17.61620857)		 3.9331e-05 TDB
period 1256.939360551332
3.44		 5.285e-06
1.447e-08		 d
yr
n .2864099982055563 1.2043e-09 deg/d
Q 2.976892533607745 8.3446e-09 au
   Orbit Determination Parameters
   # obs. used (total)      1217  
   data-arc span      12260 days (33.57 yr)  
   first obs. used      1987-04-23  
   last obs. used      2020-11-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42594  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:24:54  

Additional Information
 Earth MOID = .729949 au 
 Jupiter MOID = 2.49465 au 
 T_jup = 3.441 
[ show covariance matrix ]

[ 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. 2020-October); 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, 458-503.]
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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