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120915 (1998 SX81)
Classification: Main-belt Asteroid          SPK-ID: 2120915
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 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1072790592457038 4.0226e-08  
a 2.158433562333439 8.6976e-09 au
q 1.926878840321955 9.1485e-08 au
i 1.695477418526092 4.0085e-06 deg
node 213.5284573005374 0.0001052 deg
peri 204.4878931045102 0.00010718 deg
M 317.3136784950858 2.2138e-05 deg
tp 2459337.838621913810
(2021-May-03.33862191)
7.172e-05 TDB
period 1158.261057544617
3.17
7.001e-06
1.917e-08
d
yr
n .3108107603679255 1.8787e-09 deg/d
Q 2.389988284344924 9.6307e-09 au
  Orbit Determination Parameters
   # obs. used (total)      629  
   data-arc span      8110 days (22.20 yr)  
   first obs. used      1998-09-26  
   last obs. used      2020-12-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .55014  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 17:08:43  

Additional Information
 Earth MOID = .938295 au 
 Jupiter MOID = 2.87172 au 
 T_jup = 3.691 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457609.5 (2016-Aug-09.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1082165525448182 4.0355e-08  
q 1.924790458876656 9.1841e-08 au
tp 2458178.663341794627
(2018-Mar-01.16334179)
6.6854e-05 TDB
node 213.5978575628447 0.00010513 deg
peri 204.2541860886073 0.00010707 deg
i 1.695966995496214 4.0099e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      629  
   data-arc span      8110 days (22.20 yr)  
   first obs. used      1998-09-26  
   last obs. used      2020-12-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .55014  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 17:08:43  

Additional Information
 Jupiter MOID = 2.87172 au 
 T_jup = 3.691 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.628523985958415E-15 -3.69738603924686E-15 -1.416775232523978E-12 8.239314447687104E-15 -3.752117458470735E-13 -1.537241913542581E-15
q -3.69738603924686E-15 8.434756031919985E-15 3.334022353347376E-12 -1.826183947683973E-14 8.827326493518053E-13 3.583258106636096E-15
tp -1.416775232523978E-12 3.334022353347376E-12 4.469497189204087E-9 2.06875848271735E-12 1.358384740773409E-9 2.817802715876258E-12
node 8.239314447687104E-15 -1.826183947683973E-14 2.06875848271735E-12 1.105166695260933E-8 -1.104532877641549E-8 -1.226258154656267E-10
peri -3.752117458470735E-13 8.827326493518053E-13 1.358384740773409E-9 -1.104532877641549E-8 1.146368396052608E-8 1.233862953287907E-10
i -1.537241913542581E-15 3.583258106636096E-15 2.817802715876258E-12 -1.226258154656267E-10 1.233862953287907E-10 1.607939365012917E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 17.04   n/a E2021B55  
rotation period rot_per 7.32 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 [Result based on fragmentary lightcurve(s), may be completely wrong.]

120915 (1998 SX81)          Discovered 1998-Sep-26 by LINEAR at Socorro
Reference: 20060314/Numbers.arcLast Updated: 2006-03-23

Alternate Designations
 1998 SX81 = 2000 FG67 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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