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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3060675049221036 4.2957e-08  
a 2.279685452604044 6.2946e-09 au
q 1.581947814118308 9.8527e-08 au
i 23.17093661494768 5.9089e-06 deg
node 71.13261648644408 1.2176e-05 deg
peri 71.41952536623886 1.8103e-05 deg
M 307.7245714376617 1.1101e-05 deg
tp 2459383.060123060551
(2021-Jun-17.56012306)
3.8955e-05 TDB
period 1257.21866102782
3.44
5.2071e-06
1.426e-08
d
yr
n .2863463700941947 1.186e-09 deg/d
Q 2.97742309108978 8.2212e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1450  
   data-arc span      12325 days (33.74 yr)  
   first obs. used      1987-04-23  
   last obs. used      2021-01-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4069  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 01:28:20  

Additional Information
 Earth MOID = .729904 au 
 Jupiter MOID = 2.49386 au 
 T_jup = 3.441 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457949.5 (2017-Jul-15.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3050449761536153 4.333e-08  
q 1.584765655273213 9.9459e-08 au
tp 2458126.011256256358
(2018-Jan-07.51125626)
3.838e-05 TDB
node 71.13929476832286 1.2172e-05 deg
peri 71.5069304083241 1.8147e-05 deg
i 23.16938315671139 5.911e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1450  
   data-arc span      12325 days (33.74 yr)  
   first obs. used      1987-04-23  
   last obs. used      2021-01-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4069  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 01:28:20  

Additional Information
 Jupiter MOID = 2.49386 au 
 T_jup = 3.441 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.877475520025508E-15 -4.305436674288568E-15 1.056900008178542E-12 4.871409133374438E-14 4.270849504245224E-13 -3.623182157886233E-14
q -4.305436674288568E-15 9.892124096504181E-15 -2.393444956799061E-12 -1.108894431951792E-13 -9.713620343617284E-13 8.320719780329217E-14
tp 1.056900008178542E-12 -2.393444956799061E-12 1.472994160350745E-9 5.232347054087149E-11 5.331249660213024E-10 -3.102087169259717E-11
node 4.871409133374438E-14 -1.108894431951792E-13 5.232347054087149E-11 1.481635933380852E-10 -1.152918682706427E-10 -3.817331556481684E-11
peri 4.270849504245224E-13 -9.713620343617284E-13 5.331249660213024E-10 -1.152918682706427E-10 3.293165694608102E-10 2.284042437376448E-11
i -3.623182157886233E-14 8.320719780329217E-14 -3.102087169259717E-11 -3.817331556481684E-11 2.284042437376448E-11 3.493940138614928E-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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