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JPL Small-Body Database Browser
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385 Ilmatar (A894 EA)
Classification: Main-belt Asteroid          SPK-ID: 2000385
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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 93 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1220664760025651 4.4988e-08  
a 2.849908790399483 8.7384e-09 au
q 2.502030467426685 1.2675e-07 au
i 13.55040818380063 3.8873e-06 deg
node 345.0025175476846 1.5199e-05 deg
peri 188.2113162516263 2.178e-05 deg
M 11.11211717684522 1.6447e-05 deg
tp 2458546.257564676346
(2019-Mar-03.75756468)
8.0266e-05 TDB
period 1757.295788529426
4.81
8.0823e-06
2.213e-08
d
yr
n .204860218951109 9.4221e-10 deg/d
Q 3.197787113372281 9.805e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1947  
   data-arc span      45713 days (125.16 yr)  
   first obs. used      1894-03-05  
   last obs. used      2019-05-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51949  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-29 19:06:50  

Additional Information
 Earth MOID = 1.50908 au 
 Jupiter MOID = 1.78458 au 
 T_jup = 3.254 
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Orbital Elements at Epoch 2453701.5 (2005-Nov-27.0) TDB
Reference: JPL 93 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .126732781606959 4.49e-08  
q 2.486284880907717 1.2731e-07 au
tp 2453276.404080863934
(2004-Sep-27.90408086)
7.8407e-05 TDB
node 345.2412403648287 1.5191e-05 deg
peri 188.1034700577632 2.1333e-05 deg
i 13.56546941648903 3.8888e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1947  
   data-arc span      45713 days (125.16 yr)  
   first obs. used      1894-03-05  
   last obs. used      2019-05-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51949  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-29 19:06:50  

Additional Information
 Jupiter MOID = 1.78458 au 
 T_jup = 3.254 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.015970735097496E-15 -5.706019704091588E-15 -1.396142133128973E-12 -4.415723037123954E-15 -1.772228849107884E-13 -4.033276912116307E-15
q -5.706019704091588E-15 1.62067969709253E-14 3.856817168853342E-12 1.360952355772035E-14 4.842062679342581E-13 1.177957125866017E-14
tp -1.396142133128973E-12 3.856817168853342E-12 6.147679756701355E-9 1.007417106230503E-12 1.178510156716481E-9 1.030170841787977E-11
node -4.415723037123954E-15 1.360952355772035E-14 1.007417106230503E-12 2.307713296441117E-10 -2.237980601071719E-10 -6.94875958508894E-12
peri -1.772228849107884E-13 4.842062679342581E-13 1.178510156716481E-9 -2.237980601071719E-10 4.551035679233559E-10 8.688495314009438E-12
i -4.033276912116307E-15 1.177957125866017E-14 1.030170841787977E-11 -6.94875958508894E-12 8.688495314009438E-12 1.512311009764414E-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 7.49   n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 24
diameter diameter 85.837 km 0.576 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 62.35 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Published Reference List:
[Zeigler, K.W.; Florence, W.B.; Blanco, E.J.; McGaughey, J. (1986) Minor Planet Bull. 13, 25-26.]
geometric albedo albedo 0.242   0.042 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.847   0.073 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=5.60, mean=15.13, max.=22.96) deg.
U-B UB 0.370   0.026 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=5.60, mean=14.98, max.=22.96) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices

385 Ilmatar (A894 EA)          Discovered 1894-Mar-01 by Wolf, M. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 A894 EA = 1942 FQ = 1953 TQ = 1987 QG3 = A918 CC 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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