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12825 (1997 AJ7)
Classification: Main-belt Asteroid          SPK-ID: 2012825
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 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1517574210242455 3.78e-08  
a 2.354513443353632 7.7528e-09 au
q 1.997198555423369 8.7722e-08 au
i 1.302329790839161 2.9983e-06 deg
node 275.0020167926363 0.00017931 deg
peri 266.0528955783283 0.00017955 deg
M 182.5524333595596 1.0537e-05 deg
tp 2459850.955718197683
(2022-Sep-28.45571820)
3.9852e-05 TDB
period 1319.623948552923
3.61
6.5178e-06
1.784e-08
d
yr
n .2728049914483364 1.3474e-09 deg/d
Q 2.711828331283895 8.9293e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1320  
   data-arc span      9277 days (25.40 yr)  
   first obs. used      1995-08-20  
   last obs. used      2021-01-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51351  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 23:35:14  

Additional Information
 Earth MOID = 1.00012 au 
 Jupiter MOID = 2.2512 au 
 T_jup = 3.539 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457422.5 (2016-Feb-04.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1508269205189962 3.7824e-08  
q 1.999852847948881 8.7714e-08 au
tp 2457209.912226875836
(2015-Jul-06.41222688)
3.6647e-05 TDB
node 275.0584093156193 0.00017927 deg
peri 265.8804198720223 0.00017952 deg
i 1.302185238071412 2.9981e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1320  
   data-arc span      9277 days (25.40 yr)  
   first obs. used      1995-08-20  
   last obs. used      2021-01-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51351  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 23:35:14  

Additional Information
 Jupiter MOID = 2.2512 au 
 T_jup = 3.539 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.430630694535119E-15 -3.308826662743511E-15 -5.015585232246244E-14 -1.223819625754471E-14 -1.412422023915722E-15 1.912755759679985E-17
q -3.308826662743511E-15 7.693718714792145E-15 1.420336177126372E-13 2.865887172097743E-14 1.014325694812445E-14 -1.451054083587946E-18
tp -5.015585232246244E-14 1.420336177126372E-13 1.342970487742425E-9 -3.400703840141929E-12 3.656332227947023E-10 -5.640340217131009E-14
node -1.223819625754471E-14 2.865887172097743E-14 -3.400703840141929E-12 3.213741720700039E-8 -3.212984988363331E-8 6.103228071450509E-11
peri -1.412422023915722E-15 1.014325694812445E-14 3.656332227947023E-10 -3.212984988363331E-8 3.222613491978262E-8 -6.103008660619429E-11
i 1.912755759679985E-17 -1.451054083587946E-18 -5.640340217131009E-14 6.103228071450509E-11 -6.103008660619429E-11 8.988681033145737E-12

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.6   n/a MPO473940  
rotation period rot_per 10.79 h n/a LCDB (Rev. 2020-October); 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:
[Chang, C.-K.; Lin, H.-W.; Ip, W.-H.; Prince, T.A.; et al. (2016) Astrophys. J. Sup. Ser. 227, A20.]

12825 (1997 AJ7)          Discovered 1997-Jan-09 by Kobayashi, T. at Oizumi
Reference: 19991222/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1997 AJ7 = 1995 UO18 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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