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

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 45 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3915066283184196 6.0603e-08  
a 2.015055521915355 1.0312e-08 AU
q 1.226147928655861 1.2268e-07 AU
i 6.494151147143419 5.7792e-06 deg
node 222.7936872095331 3.8966e-05 deg
peri 155.9441638901396 4.3165e-05 deg
M 231.1211929494539 2.1555e-05 deg
tp 2457374.531310608483
(2015-Dec-18.03131061)
6.5323e-05 JED
period 1044.789868098668
2.86
8.0197e-06
2.196e-08
d
yr
n .3445668942551443 2.6449e-09 deg/d
Q 2.803963115174849 1.4349e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      692  
   data-arc span      13434 days (36.78 yr)  
   first obs. used      1978-10-07  
   last obs. used      2015-07-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .61036  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jul-20 06:17:14  

Additional Information
 Earth MOID = .234107 AU 
 T_jup = 3.720 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 17.3 mag n/a PDS3 (MPO 18731)  
rotation period rot_per 2.5162 h n/a LCDB (Rev. 2015-May); 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.]
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 | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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