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120990 (1998 XP21)
Classification: Main-belt Asteroid          SPK-ID: 2120990
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09575416334197491 3.5237e-08  
a 2.246308657252179 9.441e-09 au
q 2.031215251169161 7.8208e-08 au
i 5.477563775869952 4.0654e-06 deg
node 105.9761515231394 4.6926e-05 deg
peri 339.6394980024863 5.3413e-05 deg
M 151.1543944122857 2.4888e-05 deg
tp 2458484.177738741932
(2018-Dec-31.67773874)
8.4806e-05 TDB
period 1229.709627534301
3.37
7.7525e-06
2.123e-08
d
yr
n .2927520383180528 1.8456e-09 deg/d
Q 2.461402063335196 1.0345e-08 au
  Orbit Determination Parameters
   # obs. used (total)      415  
   data-arc span      10366 days (28.38 yr)  
   first obs. used      1991-12-03  
   last obs. used      2020-04-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .59423  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 20:41:44  

Additional Information
 Earth MOID = 1.04854 au 
 Jupiter MOID = 2.68932 au 
 T_jup = 3.618 
[ 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 16.7   n/a MPO453680  

120990 (1998 XP21)          Discovered 1998-Dec-10 by Spacewatch at Kitt Peak
Reference: 20060314/Numbers.arcLast Updated: 2006-03-23

Alternate Designations
 1998 XP21 = 2001 XQ259 = 2004 RP33 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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