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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 95 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1225887005766021 4.3046e-08  
a 2.852932181274474 7.3438e-09 au
q 2.503194932338865 1.2095e-07 au
i 13.55070002681308 3.8192e-06 deg
node 344.9424111993062 1.4961e-05 deg
peri 188.697591203542 2.1212e-05 deg
M 92.55812431873385 1.5715e-05 deg
tp 2458547.969721293352
(2019-Mar-05.46972129)
7.6773e-05 TDB
period 1760.092931155262
4.82
6.796e-06
1.861e-08
d
yr
n .2045346547490017 7.8974e-10 deg/d
Q 3.202669430210083 8.244e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2124  
   data-arc span      46075 days (126.15 yr)  
   first obs. used      1894-03-05  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51565  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:04:35  

Additional Information
 Earth MOID = 1.50978 au 
 Jupiter MOID = 1.77848 au 
 T_jup = 3.253 
[ hide covariance matrix ]
Orbital Elements at Epoch 2453825.5 (2006-Mar-31.0) TDB
Reference: JPL 95 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1266868290437736 4.2896e-08  
q 2.486406567277428 1.213e-07 au
tp 2453276.351813675023
(2004-Sep-27.85181367)
7.4771e-05 TDB
node 345.2401504213996 1.496e-05 deg
peri 188.0987479531069 2.0843e-05 deg
i 13.56556990724551 3.8205e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2124  
   data-arc span      46075 days (126.15 yr)  
   first obs. used      1894-03-05  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51565  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:04:35  

Additional Information
 Jupiter MOID = 1.77848 au 
 T_jup = 3.253 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.84004899878734E-15 -5.196594540075168E-15 -1.16170275728072E-12 -4.777972240590743E-16 -1.459886474679067E-13 -3.715242805877694E-15
q -5.196594540075168E-15 1.471487095359807E-14 3.223460035168777E-12 3.483165721385485E-15 4.010633876032872E-13 1.096131806833384E-14
tp -1.16170275728072E-12 3.223460035168777E-12 5.590655353358839E-9 -6.477635379832232E-12 1.09122576882359E-9 9.122959201123281E-12
node -4.777972240590743E-16 3.483165721385485E-15 -6.477635379832232E-12 2.238028521096698E-10 -2.182252762833829E-10 -5.846242201732428E-12
peri -1.459886474679067E-13 4.010633876032872E-13 1.09122576882359E-9 -2.182252762833829E-10 4.34450122976671E-10 7.406532188165154E-12
i -3.715242805877694E-15 1.096131806833384E-14 9.122959201123281E-12 -5.846242201732428E-12 7.406532188165154E-12 1.459614762326809E-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

[ show close-approach data ]
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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