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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 90 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2371599621972983 3.9273e-08  
a 3.110083011646436 1.3425e-08 au
q 2.372495842173907 1.2389e-07 au
i 17.47976759718638 4.9314e-06 deg
node 1.945447946649078 1.2392e-05 deg
peri 306.7367247042797 1.5221e-05 deg
M 348.4791639135369 9.1918e-06 deg
tp 2458664.611788931125
(2019-Jun-30.11178893)
5.1212e-05 TDB
period 2003.34800720967
5.48
1.2972e-05
3.552e-08
d
yr
n .1796991829200061 1.1635e-09 deg/d
Q 3.847670181118964 1.6609e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2808  
   data-arc span      38072 days (104.24 yr)  
   first obs. used      1915-09-12  
   last obs. used      2019-12-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42522  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 20:47:55  

Additional Information
 Earth MOID = 1.40304 au 
 Jupiter MOID = 1.73984 au 
 T_jup = 3.106 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456100.5 (2012-Jun-22.0) TDB
Reference: JPL 90 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2395920488007143 3.9303e-08  
q 2.36263065962582 1.2444e-07 au
tp 2456666.566189153383
(2014-Jan-09.06618915)
5.0988e-05 TDB
node 2.02434497290343 1.2371e-05 deg
peri 307.2887811849875 1.5137e-05 deg
i 17.50959681446261 4.9373e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2808  
   data-arc span      38072 days (104.24 yr)  
   first obs. used      1915-09-12  
   last obs. used      2019-12-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42522  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 20:47:55  

Additional Information
 Jupiter MOID = 1.73984 au 
 T_jup = 3.106 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.544718972127589E-15 -4.874500832663453E-15 6.504374306513207E-13 2.556426601962174E-15 1.219179730302911E-13 -4.13580178503242E-16
q -4.874500832663453E-15 1.548427011436093E-14 -2.113090282989342E-12 -7.933342813333108E-15 -4.013102409533035E-13 1.71743105557482E-15
tp 6.504374306513207E-13 -2.113090282989342E-12 2.59978099166714E-9 1.068457482150565E-12 4.597475020416309E-10 -1.886778340061959E-12
node 2.556426601962174E-15 -7.933342813333108E-15 1.068457482150565E-12 1.530465052425503E-10 -1.453044750452874E-10 -6.853438716796349E-12
peri 1.219179730302911E-13 -4.013102409533035E-13 4.597475020416309E-10 -1.453044750452874E-10 2.291398695369025E-10 6.18361532315668E-12
i -4.13580178503242E-16 1.71743105557482E-15 -1.886778340061959E-12 -6.853438716796349E-12 6.18361532315668E-12 2.437711053528928E-11

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] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 7.787 h n/a LCDB (Rev. 2019-January); 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] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
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 ]
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