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12538 (1998 OH)
Classification: Apollo [NEO, PHA]          SPK-ID: 2012538
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 425 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4060368598738667 9.9096e-09  
a 1.541841884104418 2.2853e-09 au
q .9157972470606541 1.525e-08 au
i 24.52434708202643 6.2719e-07 deg
node 220.7387962640603 2.1145e-06 deg
peri 321.7095844210473 3.101e-06 deg
M 316.2185066118586 2.4798e-06 deg
tp 2459285.544504675667
(2021-Mar-12.04450468)
4.9473e-06 TDB
period 699.2913972078587
1.91
1.5547e-06
4.257e-09
d
yr
n .5148068479569654 1.1446e-09 deg/d
Q 2.167886521148183 3.2132e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2376  
   # delay obs. used      0  
   # Doppler obs. used      1  
   data-arc span      10801 days (29.57 yr)  
   first obs. used      1991-10-10  
   last obs. used      2021-05-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .40128  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-07 05:55:33  

Additional Information
 Earth MOID = .0297217 au 
 Jupiter MOID = 2.89754 au 
 T_jup = 4.280 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457595.5 (2016-Jul-26.0) TDB
Reference: JPL 425 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4060572044015403 9.9307e-09  
q .9155834105204905 1.5265e-08 au
tp 2457887.287329761743
(2017-May-13.78732976)
3.5099e-06 TDB
node 220.7487317456269 2.1146e-06 deg
peri 321.7139940008949 3.1013e-06 deg
i 24.5278991993505 6.2723e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2376  
   # delay obs. used      0  
   # Doppler obs. used      1  
   data-arc span      10801 days (29.57 yr)  
   first obs. used      1991-10-10  
   last obs. used      2021-05-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .40128  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-07 05:55:33  

Additional Information
 Jupiter MOID = 2.89754 au 
 T_jup = 4.280 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.861823493662873E-17 -1.50960498761663E-16 2.084301089278926E-14 -3.802673185492865E-15 1.506435982787698E-14 1.160847943766462E-15
q -1.50960498761663E-16 2.330172930756922E-16 -3.155932912285841E-14 6.647770773484212E-15 -2.44114353798889E-14 -1.853837323082737E-15
tp 2.084301089278926E-14 -3.155932912285841E-14 1.231964266497018E-11 -3.443449357235883E-12 8.947224017401028E-12 3.267570338818581E-13
node -3.802673185492865E-15 6.647770773484212E-15 -3.443449357235883E-12 4.471526657667192E-12 -5.128872813212721E-12 -5.234170685584414E-13
peri 1.506435982787698E-14 -2.44114353798889E-14 8.947224017401028E-12 -5.128872813212721E-12 9.617846313841385E-12 4.638318726617574E-13
i 1.160847943766462E-15 -1.853837323082737E-15 3.267570338818581E-13 -5.234170685584414E-13 4.638318726617574E-13 3.934133571204647E-13

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.91   n/a MPCxxxxx  
diameter diameter 1.663 km 0.329 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2011ApJ...743..156M)  
rotation period rot_per 2.575 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Vaduvescu, O.; Aznar, A.M.; Tudor, V.; Predatu, M.; et al. (2017) Earth, Moon, and Planets 120, 41-100.]
[Benishek, V. (2019) Minor Planet Bull. 46, 506-508.]
[Skiff, B.A.; McLelland, K.P.; Sanborn, J.; Pravec, P.; Koehn, B.W. (2019). Minor Planet Bull. 46, 458-503.]
[Warner, B.D. (2019) Minor Planet Bull. 46, 157-160.]
[Warner, B.D.; Stephens, R.D. (2019) Minor Planet Bull. 46, 423-438.]
geometric albedo albedo 0.232   0.116 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2011ApJ...743..156M)  
SMASSII spectral type spec_B S:   n/a Binzel et al. (2004) Icarus 170, 259-294 SMASSIR data only, classification consistent with specified type, but uncertain

12538 (1998 OH)          Discovered 1998-Jul-19 by JPL/GEODSS NEAT at Haleakala
Reference: 19991123/Numbers.arcLast Updated: 2004-04-19

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