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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3060675054212976 4.2647e-08  
a 2.279685453012228 6.285e-09 au
q 1.581947813263555 9.7852e-08 au
i 23.17093676011615 5.8544e-06 deg
node 71.13261657615975 1.1982e-05 deg
peri 71.41952533090144 1.8024e-05 deg
M 307.7245713338855 1.1019e-05 deg
tp 2459383.060123471998
(2021-Jun-17.56012347)
3.8668e-05 TDB
period 1257.218661365483
3.44
5.1992e-06
1.423e-08
d
yr
n .2863463700172879 1.1842e-09 deg/d
Q 2.977423092760901 8.2087e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1514  
   data-arc span      12375 days (33.88 yr)  
   first obs. used      1987-04-23  
   last obs. used      2021-03-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .40677  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 18:13:05  

Additional Information
 Earth MOID = .729904 au 
 Jupiter MOID = 2.49386 au 
 T_jup = 3.441 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457980.5 (2017-Aug-15.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3050378686846465 4.3018e-08  
q 1.584763084537242 9.8779e-08 au
tp 2458126.013971875905
(2018-Jan-07.51397188)
3.8117e-05 TDB
node 71.13926226218842 1.1977e-05 deg
peri 71.50813864983519 1.8068e-05 deg
i 23.16948942745939 5.8563e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1514  
   data-arc span      12375 days (33.88 yr)  
   first obs. used      1987-04-23  
   last obs. used      2021-03-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .40677  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 18:13:05  

Additional Information
 Jupiter MOID = 2.49386 au 
 T_jup = 3.441 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.850561824921593E-15 -4.245202039221939E-15 1.035728828628832E-12 4.44118728820549E-14 4.238028758319751E-13 -3.447904562978675E-14
q -4.245202039221939E-15 9.757303282142056E-15 -2.346179557031852E-12 -1.012488628103055E-13 -9.640647235006995E-13 7.928265084015304E-14
tp 1.035728828628832E-12 -2.346179557031852E-12 1.452903854818768E-9 4.720952251708245E-11 5.309424810046421E-10 -2.908989790563727E-11
node 4.44118728820549E-14 -1.012488628103055E-13 4.720952251708245E-11 1.434594397899959E-10 -1.12866881494156E-10 -3.649651427580892E-11
peri 4.238028758319751E-13 -9.640647235006995E-13 5.309424810046421E-10 -1.12866881494156E-10 3.264656730404585E-10 2.200789953816073E-11
i -3.447904562978675E-14 7.928265084015304E-14 -2.908989790563727E-11 -3.649651427580892E-11 2.200789953816073E-11 3.429669095959882E-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. 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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