Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
31345 (1998 PG)
Classification: Amor [NEO]          SPK-ID: 2031345
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 144 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3914903759933922 4.0086e-08  
a 2.015265623773854 1.2653e-09 au
q 1.22630852699607 8.1029e-08 au
i 6.503304222687435 3.5791e-06 deg
node 222.7221407336425 2.8209e-05 deg
peri 156.1559211405147 2.9045e-05 deg
M 268.6997408520257 4.5965e-06 deg
tp 2459465.512513730331
(2021-Sep-08.01251373)
1.349e-05 TDB
period 1044.953276510343
2.86
9.8412e-07
2.694e-09
d
yr
n .3445130113398296 3.2446e-10 deg/d
Q 2.804222720551638 1.7606e-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.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49562  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 06:48:36  

Additional Information
 Earth MOID = .233146 au 
 Jupiter MOID = 2.66988 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 17.37   n/a E2021B10  
rotation period rot_per 2.5163 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:
[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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-May-08 09:38 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin