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31239 Michaeljames (1998 DV1)
Classification: Main-belt Asteroid          SPK-ID: 2031239
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 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .199319515452303 5.1645e-08  
a 2.592283129387271 1.4156e-08 au
q 2.075590512122621 1.3895e-07 au
i 12.01415829713573 5.2305e-06 deg
node 310.7186946829064 2.1799e-05 deg
peri 69.75565936201139 2.5298e-05 deg
M 209.440004555153 1.2832e-05 deg
tp 2459638.071901911556
(2022-Feb-27.57190191)
5.7026e-05 TDB
period 1524.481214349131
4.17
1.2487e-05
3.419e-08
d
yr
n .2361459076120528 1.9343e-09 deg/d
Q 3.108975746651922 1.6978e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1479  
   data-arc span      8713 days (23.85 yr)  
   first obs. used      1996-08-09  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45173  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 19:56:32  

Additional Information
 Earth MOID = 1.11166 au 
 Jupiter MOID = 2.50517 au 
 T_jup = 3.360 
[ 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 13.7   n/a MPO474164  
diameter diameter 4.517 km 0.043 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 2.980232 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 sidereal period (not synodic); Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Durech, J.; Hanus, J.; Ali-Lagoa, V. (2018) Astron. Astrophys. 617, A57.]
geometric albedo albedo 0.343   0.024 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

31239 Michaeljames           Discovered 1998 Feb. 21 by I. P. Griffin at Cocoa.
Michael James (b. 1970) is a high-school teacher of English at Kenwood High School, Baltimore County, Maryland. During his teaching career he has inspired many students to take a deep interest in literature.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20070601/MPCPages.arcLast Updated: 2007-06-06

[ show close-approach data ]
Alternate Designations
 1998 DV1 = 2000 ON23 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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