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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 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3060282386009039 6.6984e-08  
a 2.279347807730809 8.3245e-09 au
q 1.581803012972118 1.5025e-07 au
i 23.17172877117761 6.3988e-06 deg
node 71.1307040408328 1.8785e-05 deg
peri 71.44646050771256 2.66e-05 deg
M 250.4148907261774 1.1791e-05 deg
tp 2459383.116214467206
(2021-Jun-17.61621447)
4.1236e-05 TDB
period 1256.939360839764
3.44
6.8858e-06
1.885e-08
d
yr
n .2864099981398334 1.569e-09 deg/d
Q 2.976892602489501 1.0872e-08 au
  Orbit Determination Parameters
   # obs. used (total)      956  
   data-arc span      11424 days (31.28 yr)  
   first obs. used      1987-04-23  
   last obs. used      2018-08-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43679  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-12 18:42:03  

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. 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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