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9421 Violilla (1995 YM2)
Classification: Main-belt Asteroid          SPK-ID: 2009421
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1293237453832235 4.0052e-08  
a 2.379973055840417 8.6396e-09 au
q 2.072186026347978 9.4227e-08 au
i 4.091176152551999 4.8897e-06 deg
node 70.92584492236335 5.3903e-05 deg
peri 26.62004269253446 5.6727e-05 deg
M 131.5926193460613 1.7845e-05 deg
tp 2458110.286216541946
(2017-Dec-22.78621654)
6.5647e-05 TDB
period 1341.085563323287
3.67
7.3025e-06
1.999e-08
d
yr
n .2684392479089101 1.4617e-09 deg/d
Q 2.687760085332855 9.7569e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1121  
   data-arc span      10169 days (27.84 yr)  
   first obs. used      1991-10-17  
   last obs. used      2019-08-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5761  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-24 01:04:03  

Additional Information
 Earth MOID = 1.09003 au 
 Jupiter MOID = 2.46018 au 
 T_jup = 3.524 
[ 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 15.0   n/a MPO435789  
rotation period rot_per 4.605 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]

9421 Violilla (1995 YM2)          Discovered 1995-Dec-24 by Laurie, S. P. at Church Stretton
Reference: 19981005/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1995 YM2 = 1991 VQ7 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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