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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09525070048408546 3.517e-08  
a 2.247286675632856 8.7484e-09 au
q 2.033231045590275 7.785e-08 au
i 5.477140498200148 3.6043e-06 deg
node 105.9768666308132 4.0465e-05 deg
peri 339.7032049615398 4.5297e-05 deg
M 209.6063673570231 2.1508e-05 deg
tp 2459714.559146532146
(2022-May-15.05914653)
7.4687e-05 TDB
period 1230.512818258031
3.37
7.1854e-06
1.967e-08
d
yr
n .2925609507340461 1.7084e-09 deg/d
Q 2.461342305675438 9.5817e-09 au
  Orbit Determination Parameters
   # obs. used (total)      477  
   data-arc span      10455 days (28.62 yr)  
   first obs. used      1991-12-03  
   last obs. used      2020-07-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56711  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 17:53:20  

Additional Information
 Earth MOID = 1.05023 au 
 Jupiter MOID = 2.68824 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 16.76   n/a E2021B55  

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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