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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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 97 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2368689577022748 3.4848e-08  
a 3.110213475622109 1.227e-08 au
q 2.373500451419931 1.0843e-07 au
i 17.47878573306701 4.3838e-06 deg
node 1.932923935990652 1.1854e-05 deg
peri 306.8562042783514 1.4382e-05 deg
M 96.23773913541629 8.9777e-06 deg
tp 2458664.917182044015
(2019-Jun-30.41718204)		 4.9312e-05 TDB
period 2003.474065333678
5.49		 1.1856e-05
3.246e-08		 d
yr
n .179687876289051 1.0633e-09 deg/d
Q 3.846926499824287 1.5176e-08 au
   Orbit Determination Parameters
   # obs. used (total)      3295  
   data-arc span      38480 days (105.35 yr)  
   first obs. used      1915-09-12  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39691  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:49:23  

Additional Information
 Earth MOID = 1.40283 au 
 Jupiter MOID = 1.74337 au 
 T_jup = 3.106 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456545.5 (2013-Sep-10.0) TDB
Reference: JPL 97 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2394031469270489 3.4734e-08  
q 2.363848183816407 1.0837e-07 au
tp 2456666.414268420067
(2014-Jan-08.91426842)		 4.8592e-05 TDB
node 2.012738557044701 1.1837e-05 deg
peri 307.2189313072445 1.4318e-05 deg
i 17.50501775099361 4.3883e-06 deg
   Orbit Determination Parameters
   # obs. used (total)      3295  
   data-arc span      38480 days (105.35 yr)  
   first obs. used      1915-09-12  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39691  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:49:23  

Additional Information
 Jupiter MOID = 1.74337 au 
 T_jup = 3.106 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.206455163859893E-15 -3.749881971479283E-15 4.398849272242975E-13 2.632531275717426E-15 6.418905815694415E-14 -1.394550583683734E-16
q -3.749881971479283E-15 1.174502571587685E-14 -1.422937554942594E-12 -8.420004106695316E-15 -2.109512714437214E-13 7.174022974701452E-16
tp 4.398849272242975E-13 -1.422937554942594E-12 2.361198424108782E-9 1.552300767399643E-12 4.071697213696521E-10 -2.358276335628336E-12
node 2.632531275717426E-15 -8.420004106695316E-15 1.552300767399643E-12 1.401171570971303E-10 -1.329214610331036E-10 -5.411922342119173E-13
peri 6.418905815694415E-14 -2.109512714437214E-13 4.071697213696521E-10 -1.329214610331036E-10 2.049959780826137E-10 9.464991623813298E-14
i -1.394550583683734E-16 7.174022974701452E-16 -2.358276335628336E-12 -5.411922342119173E-13 9.464991623813298E-14 1.925699174503889E-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 9.87   n/a E2021B10 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. 2020-October); 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

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Alternate Designations
 A913 EJ = 1926 WA = 1975 XN 
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