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31345 (1998 PG)
Classification: Amor [NEO]          SPK-ID: 2031345
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 143 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3914685972368258 4.0085e-08  
a 2.015144466702333 1.2677e-09 au
q 1.226278689092819 8.102e-08 au
i 6.503472979155169 3.5792e-06 deg
node 222.7232547452595 2.8208e-05 deg
peri 156.1703370731907 2.9045e-05 deg
M 199.7644385295426 4.5644e-06 deg
tp 2459465.565487961749
(2021-Sep-08.06548796)
1.3488e-05 TDB
period 1044.859044582919
2.86
9.8599e-07
2.699e-09
d
yr
n .3445440816791731 3.2513e-10 deg/d
Q 2.804010244311846 1.764e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1223  
   data-arc span      15197 days (41.61 yr)  
   first obs. used      1978-10-07  
   last obs. used      2020-05-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49557  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-17 07:13:29  

Additional Information
 Earth MOID = .234368 au 
 Jupiter MOID = 2.66892 au 
 T_jup = 3.720 
[ show covariance matrix ]

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 17.5   n/a MPO493069  
rotation period rot_per 2.5163 h n/a LCDB (Rev. 2019-August); 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:
[Kiss, L.L.; Szabo, G.; Sarneczky, K. (1999) Astron. Astrophys. Suppl. Ser. 140, 21-28.]
[Pravec, P.; Sarounova, L.; Rabinowitz, D.L.; Hicks, M.D.; et al. (2000) Icarus 146, 190-203.]
[Warner, B.D.; Benishek, V.; Oey, J.; Pray, P.; Aznar, A.; Pravec, P. (2019) Minor Planet Bull. 46, 55-58.]
SMASSII spectral type spec_B Sq   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

31345 (1998 PG)          Discovered 1998-Aug-03 by LONEOS at Anderson Mesa
Reference: 20011130/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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