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JPL Small-Body Database Browser
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746 Marlu (A913 EJ)
Classification: Main-belt Asteroid          SPK-ID: 2000746
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 92 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2369102821122218 3.9069e-08  
a 3.109424907603378 1.2983e-08 au
q 2.372770175536293 1.2302e-07 au
i 17.48015047027918 4.9287e-06 deg
node 1.938520236677736 1.2206e-05 deg
peri 306.7896735249205 1.5047e-05 deg
M 60.35220810883287 9.0717e-06 deg
tp 2458664.755273474124
5.0211e-05 TDB
period 2002.712168067728
n .1797562354391335 1.1259e-09 deg/d
Q 3.846079639670464 1.6059e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2886  
   data-arc span      38122 days (104.37 yr)  
   first obs. used      1915-09-12  
   last obs. used      2020-01-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .422  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:35:44  

Additional Information
 Earth MOID = 1.40405 au 
 Jupiter MOID = 1.74409 au 
 T_jup = 3.106 
[ 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 9.8   n/a MPO502160 IRAS observations used: 14
diameter diameter 74.274 km 1.122 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 7.787 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Harris, A.W.; Young, J.W.; Dockweiler, T.; Gibson, J.; et al. (1992) Icarus 95, 115-147.]
[Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.]
[Klinglesmith, D.A.; Dehart, A.; Hanowell, J.; Henderickx, S. (2015) Minor Planet Bull. 42, 101-104.]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
geometric albedo albedo 0.032   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
B-V BV 0.726   0.028 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=12.94 deg.
U-B UB 0.283   0.050 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=12.94 deg.
Tholen spectral type spec_T P   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo

746 Marlu (A913 EJ)          Discovered 1913-Mar-01 by Kaiser, F. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A913 EJ = 1926 WA = 1975 XN 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2020-Jun-01 23:31 UT
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