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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 97 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1225886937062177 4.1616e-08  
a 2.852932181649986 7.3148e-09 au
q 2.503194952269084 1.1665e-07 au
i 13.55069991830061 3.7658e-06 deg
node 344.9424111340394 1.4932e-05 deg
peri 188.6975910203095 2.1196e-05 deg
M 92.55812373987108 1.568e-05 deg
tp 2458547.969724034152
(2019-Mar-05.46972403)
7.661e-05 TDB
period 1760.092931502766
4.82
6.7692e-06
1.853e-08
d
yr
n .2045346547086195 7.8663e-10 deg/d
Q 3.202669411030887 8.2115e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2210  
   data-arc span      46175 days (126.42 yr)  
   first obs. used      1894-03-05  
   last obs. used      2020-08-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50629  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:15:20  

Additional Information
 Earth MOID = 1.50978 au 
 Jupiter MOID = 1.77848 au 
 T_jup = 3.253 
[ hide covariance matrix ]
Orbital Elements at Epoch 2453907.5 (2006-Jun-21.0) TDB
Reference: JPL 97 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1266253668983675 4.1462e-08  
q 2.486665085763022 1.1693e-07 au
tp 2453276.305875278995
(2004-Sep-27.80587528)
7.4763e-05 TDB
node 345.2410449591782 1.4931e-05 deg
peri 188.1001079011984 2.0833e-05 deg
i 13.56531570700266 3.7669e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2210  
   data-arc span      46175 days (126.42 yr)  
   first obs. used      1894-03-05  
   last obs. used      2020-08-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50629  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:15:20  

Additional Information
 Jupiter MOID = 1.77848 au 
 T_jup = 3.253 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.71908717450642E-15 -4.841320885664396E-15 -1.135357788321802E-12 1.189277677712078E-15 -1.508796736089769E-13 -3.208392664033216E-15
q -4.841320885664396E-15 1.367168608343221E-14 3.14624599503481E-12 -1.306590064822758E-15 4.153990705382854E-13 9.491399601781595E-15
tp -1.135357788321802E-12 3.14624599503481E-12 5.589565741058015E-9 -7.754622870201972E-12 1.094064235601736E-9 8.335330517940313E-12
node 1.189277677712078E-15 -1.306590064822758E-15 -7.754622870201972E-12 2.229359152982306E-10 -2.175323301071781E-10 -6.41301429704976E-12
peri -1.508796736089769E-13 4.153990705382854E-13 1.094064235601736E-9 -2.175323301071781E-10 4.340026840491689E-10 7.82244942291711E-12
i -3.208392664033216E-15 9.491399601781595E-15 8.335330517940313E-12 -6.41301429704976E-12 7.82244942291711E-12 1.418947550596628E-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 7.6   n/a MPO473766 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-August); 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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