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JPL Small-Body Database Browser
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2391 Tomita (1957 AA)
Classification: Main-belt Asteroid          SPK-ID: 2002391
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .133407607638514 3.2232e-08  
a 2.441216351300898 7.8147e-09 au
q 2.115539518145823 7.6904e-08 au
i 3.012887820981594 3.5686e-06 deg
node 163.1777973261577 6.8241e-05 deg
peri 283.5690176975969 6.9642e-05 deg
M 242.5714425789465 1.4947e-05 deg
tp 2459454.942622213118
(2021-Aug-28.44262221)
5.86e-05 TDB
period 1393.181927715576
3.81
6.6897e-06
1.832e-08
d
yr
n .2584012847412528 1.2408e-09 deg/d
Q 2.766893184455972 8.8572e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2587  
   data-arc span      32830 days (89.88 yr)  
   first obs. used      1929-10-27  
   last obs. used      2019-09-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46404  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 16:20:21  

Additional Information
 Earth MOID = 1.13427 au 
 Jupiter MOID = 2.4241 au 
 T_jup = 3.487 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.5   n/a MPO337267  
diameter diameter 17.941 km 0.129 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 7.9533 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Pravec, P.; Wolf, M.; Sarounova, L. (2013) http://www.asu.cas.cz/~ppravec/neo.htm]
geometric albedo albedo 0.070   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

2391 Tomita (1957 AA)          Discovered 1957-Jan-09 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1957 AA = 1929 VX = 1938 BF = 1942 DF = 1957 BA = 1977 KM = 1978 PA4 = 1980 DC6 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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