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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 182 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4682240460571821 4.9152e-08  
a 1.647262456797862 6.3011e-09 au
q .8759745643578732 8.0462e-08 au
i 40.71483821073388 5.0046e-06 deg
node 169.1709734840278 1.0035e-05 deg
peri 278.9405469951797 1.1321e-05 deg
M 228.2142511668154 1.8521e-05 deg
tp 2459483.188782500268
(2021-Sep-25.68878250)
4.1211e-05 TDB
period 772.2228131731839
2.11
4.4308e-06
1.213e-08
d
yr
n .466186693605572 2.6749e-09 deg/d
Q 2.418550349237852 9.2514e-09 au
  Orbit Determination Parameters
   # obs. used (total)      821  
   data-arc span      12069 days (33.04 yr)  
   first obs. used      1987-08-23  
   last obs. used      2020-09-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48451  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 16:07:41  

Additional Information
 Earth MOID = .169717 au 
 Jupiter MOID = 3.36427 au 
 T_jup = 3.912 
[ 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 15.87   n/a E2020-QM5  
rotation period rot_per 4.4 h n/a LCDB (Rev. 2020-October); 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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