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74145 (1998 QO84)
Classification: Main-belt Asteroid          SPK-ID: 2074145
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .302614487788157 3.0543e-08  
a 2.653638689257077 1.053e-08 au
q 1.85060917653271 7.966e-08 au
i 10.0441547444248 3.696e-06 deg
node 287.8337667923591 2.823e-05 deg
peri 19.95261262502466 2.968e-05 deg
M 26.35293293444684 1.0044e-05 deg
tp 2458884.918701683690
(2020-Feb-05.41870168)
4.3671e-05 TDB
period 1578.923586887839
4.32
9.3981e-06
2.573e-08
d
yr
n .2280034341051193 1.3571e-09 deg/d
Q 3.456668201981443 1.3717e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1158  
   data-arc span      8176 days (22.38 yr)  
   first obs. used      1998-06-29  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47715  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-17 22:00:14  

Additional Information
 Earth MOID = .838987 au 
 Jupiter MOID = 1.8304 au 
 T_jup = 3.301 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457772.5 (2017-Jan-19.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3024048595011238 3.0456e-08  
q 1.851376898942191 7.9407e-08 au
tp 2457306.793094909701
(2015-Oct-11.29309491)
3.9605e-05 TDB
node 287.843408321623 2.8249e-05 deg
peri 20.1246695129259 2.9707e-05 deg
i 10.04000677415459 3.6951e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1158  
   data-arc span      8176 days (22.38 yr)  
   first obs. used      1998-06-29  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47715  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-17 22:00:14  

Additional Information
 Jupiter MOID = 1.8304 au 
 T_jup = 3.301 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.275627926760766E-16 -2.40882915559019E-15 1.868272277410396E-13 5.794560083279093E-16 1.08040335749957E-14 -1.799328007408316E-16
q -2.40882915559019E-15 6.305494583148064E-15 -3.946595810973235E-13 -2.569370189535652E-15 -1.353501500307594E-15 -1.55019407566601E-16
tp 1.868272277410396E-13 -3.946595810973235E-13 1.568540304686054E-9 -2.3675078973105E-11 3.954570267119796E-10 -6.834417785100336E-12
node 5.794560083279093E-16 -2.569370189535652E-15 -2.3675078973105E-11 7.979929479686936E-10 -7.909930820918497E-10 -2.717334739375276E-11
peri 1.08040335749957E-14 -1.353501500307594E-15 3.954570267119796E-10 -7.909930820918497E-10 8.825006335052235E-10 2.513313987334684E-11
i -1.799328007408316E-16 -1.55019407566601E-16 -6.834417785100336E-12 -2.717334739375276E-11 2.513313987334684E-11 1.365358580985125E-11

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 14.4   n/a MPO474627  
diameter diameter 7.609 km 0.193 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 62.4027 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:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.044   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

74145 (1998 QO84)          Discovered 1998-Aug-24 by LINEAR at Socorro
Reference: 20040415/Numbers.arcLast Updated: 2004-04-19

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