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21228 (1995 SC)
Classification: Mars-crossing Asteroid          SPK-ID: 2021228
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .401066958834465 6.1066e-08  
a 2.757368841411857 8.8105e-09 au
q 1.651479305801891 1.6687e-07 au
i 28.32169541985494 9.5873e-06 deg
node 317.2872618448841 1.2918e-05 deg
peri 75.70247253410585 1.6729e-05 deg
M 214.0068966827599 7.3369e-06 deg
tp 2460074.719952254566
(2023-May-10.21995225)
3.5305e-05 TDB
period 1672.402170129165
4.58
8.0156e-06
2.195e-08
d
yr
n .2152592279715806 1.0317e-09 deg/d
Q 3.863258377021822 1.2344e-08 au
  Orbit Determination Parameters
   # obs. used (total)      703  
   data-arc span      23861 days (65.33 yr)  
   first obs. used      1954-12-30  
   last obs. used      2020-04-28  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50162  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 14:58:53  

Additional Information
 Earth MOID = .844429 au 
 Jupiter MOID = 2.45976 au 
 T_jup = 3.061 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457121.5 (2015-Apr-09.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3984713581537512 6.0479e-08  
q 1.661808577034352 1.6492e-07 au
tp 2456727.843048843193
(2014-Mar-11.34304884)
3.3474e-05 TDB
node 317.3587003142467 1.2876e-05 deg
peri 75.84561975996341 1.6783e-05 deg
i 28.32652791461512 9.5854e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      703  
   data-arc span      23861 days (65.33 yr)  
   first obs. used      1954-12-30  
   last obs. used      2020-04-28  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50162  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 14:58:53  

Additional Information
 Jupiter MOID = 2.45976 au 
 T_jup = 3.061 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.657730926145766E-15 -9.969241347205572E-15 -1.035790630812176E-12 -2.413300460963975E-14 -4.159131076403602E-13 -8.733397293464001E-14
q -9.969241347205572E-15 2.719780459093934E-14 2.825572681343246E-12 6.387204899623158E-14 1.132177137158655E-12 2.340415289080689E-13
tp -1.035790630812176E-12 2.825572681343246E-12 1.120494607788278E-9 -4.999258504637496E-12 3.844540208187941E-10 1.714564172716064E-11
node -2.413300460963975E-14 6.387204899623158E-14 -4.999258504637496E-12 1.657918920705005E-10 -1.46091893441517E-10 5.786726148138165E-11
peri -4.159131076403602E-13 1.132177137158655E-12 3.844540208187941E-10 -1.46091893441517E-10 2.816578175493448E-10 -4.253492608870413E-11
i -8.733397293464001E-14 2.340415289080689E-13 1.714564172716064E-11 5.786726148138165E-11 -4.253492608870413E-11 9.187937525123982E-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 15.13   n/a E2021B10  

21228 (1995 SC)          Discovered 1995-Sep-20 by Spahr, T. B. at Catalina Station
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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