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1555 Dejan (1941 SA)
Classification: Main-belt Asteroid          SPK-ID: 2001555
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .276140276636951 3.2303e-08  
a 2.691081583412597 7.9066e-09 au
q 1.947965570516438 8.79e-08 au
i 6.020622409485523 3.5393e-06 deg
node 318.0378444025134 3.354e-05 deg
peri 47.59621642591394 3.3977e-05 deg
M 295.6202083080109 7.0331e-06 deg
tp 2459288.860512978433
(2021-Mar-15.36051298)
3.2259e-05 TDB
period 1612.459157508474
4.41
7.1063e-06
1.946e-08
d
yr
n .2232614688711011 9.8393e-10 deg/d
Q 3.434197596308755 1.009e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2725  
   data-arc span      32249 days (88.29 yr)  
   first obs. used      1932-08-01  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41861  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:01:19  

Additional Information
 Earth MOID = .951907 au 
 Jupiter MOID = 2.06684 au 
 T_jup = 3.308 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456402.5 (2013-Apr-20.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2764363806145331 3.2267e-08  
q 1.946690023285869 8.7807e-08 au
tp 2456070.336645733329
(2012-May-22.83664573)
2.6581e-05 TDB
node 318.0977105598047 3.3583e-05 deg
peri 48.12493594396397 3.4023e-05 deg
i 6.017348653091266 3.5374e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2725  
   data-arc span      32249 days (88.29 yr)  
   first obs. used      1932-08-01  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41861  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:01:19  

Additional Information
 Jupiter MOID = 2.06684 au 
 T_jup = 3.308 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.041146591663453E-15 -2.827161644855209E-15 -2.796006269549204E-14 -4.433042673834604E-16 -1.14903170180598E-14 7.520115866834106E-17
q -2.827161644855209E-15 7.710151614142382E-15 9.677876556568894E-14 6.263883263687472E-16 3.537709848610503E-14 -5.784843307171813E-17
tp -2.796006269549204E-14 9.677876556568894E-14 7.065556464139255E-10 -5.892598926903168E-12 1.610760604845002E-10 -3.038967574917338E-13
node -4.433042673834604E-16 6.263883263687472E-16 -5.892598926903168E-12 1.127841061894231E-9 -1.122441163976643E-9 1.900019660093829E-11
peri -1.14903170180598E-14 3.537709848610503E-14 1.610760604845002E-10 -1.122441163976643E-9 1.157590887860971E-9 -1.894839545352141E-11
i 7.520115866834106E-17 -5.784843307171813E-17 -3.038967574917338E-13 1.900019660093829E-11 -1.894839545352141E-11 1.251331076828438E-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 11.6   n/a MPO435711  
diameter diameter 23.199 km 0.314 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 16.960 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Brines, P.; Lozano, J.; Rodrigo, O.; Fornas, A.; et al. (2017) Minor Planet Bull. 44, 145-149.]
geometric albedo albedo 0.053   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

1555 Dejan (1941 SA)          Discovered 1941-Sep-15 by Rigaux, F. at Uccle
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1941 SA = 1932 PC = 1934 CD1 = 1954 NJ 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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