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4257 Ubasti (1987 QA)
Classification: Apollo [NEO]          SPK-ID: 2004257
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 172 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4683921790702766 4.9179e-08  
a 1.647086658045654 6.379e-09 au
q .8756041491660707 8.0498e-08 au
i 40.71242261767524 5.7151e-06 deg
node 169.1866850025058 1.0091e-05 deg
peri 278.9331539049323 1.1489e-05 deg
M 134.9599024260548 1.8066e-05 deg
tp 2458711.048799192593
(2019-Aug-15.54879919)
3.7238e-05 TDB
period 772.0991970023061
2.11
4.4854e-06
1.228e-08
d
yr
n .4662613319605936 2.7087e-09 deg/d
Q 2.418569166925238 9.3669e-09 au
  Orbit Determination Parameters
   # obs. used (total)      788  
   data-arc span      12000 days (32.85 yr)  
   first obs. used      1987-08-23  
   last obs. used      2020-06-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47985  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jul-01 05:58:38  

Additional Information
 Earth MOID = .169603 au 
 Jupiter MOID = 3.36504 au 
 T_jup = 3.913 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.9   n/a MPO452225  
rotation period rot_per 4.4 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on fragmentary lightcurve(s), may be completely wrong.
Published Reference List:
[Skiff, B.A.; McLelland, K.P.; Sanborn, J.J.; Pravec, P.; Koehn, B.W. (2019) Minor Plantet Bull. 46, 238-265.]

4257 Ubasti (1987 QA)          Discovered 1987-Aug-23 by Mueller, J. at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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