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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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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 98 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1225886912868649 4.0614e-08  
a 2.852932181815672 7.2899e-09 au
q 2.503194959316709 1.1362e-07 au
i 13.55069999976822 3.7376e-06 deg
node 344.9424114133763 1.4834e-05 deg
peri 188.697590609177 2.1124e-05 deg
M 92.55812356914578 1.5667e-05 deg
tp 2458547.969724829431
(2019-Mar-05.46972483)
7.6552e-05 TDB
period 1760.092931656094
4.82
6.7461e-06
1.847e-08
d
yr
n .2045346546908016 7.8395e-10 deg/d
Q 3.202669404314636 8.1835e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2329  
   data-arc span      46259 days (126.65 yr)  
   first obs. used      1894-03-05  
   last obs. used      2020-10-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49414  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:30:12  

Additional Information
 Earth MOID = 1.50978 au 
 Jupiter MOID = 1.77848 au 
 T_jup = 3.253 
[ hide covariance matrix ]
Orbital Elements at Epoch 2454019.5 (2006-Oct-11.0) TDB
Reference: JPL 98 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1265544171667821 4.0455e-08  
q 2.486990591986588 1.1384e-07 au
tp 2453276.233492744380
(2004-Sep-27.73349274)
7.4803e-05 TDB
node 345.2417712897316 1.4834e-05 deg
peri 188.0998552450919 2.0766e-05 deg
i 13.56488229754441 3.7383e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2329  
   data-arc span      46259 days (126.65 yr)  
   first obs. used      1894-03-05  
   last obs. used      2020-10-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49414  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:30:12  

Additional Information
 Jupiter MOID = 1.77848 au 
 T_jup = 3.253 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.636602273978926E-15 -4.598815768182652E-15 -1.128949847097478E-12 2.070387303353396E-15 -1.565010865934409E-13 -3.148151208614878E-15
q -4.598815768182652E-15 1.295888092788766E-14 3.127738072189164E-12 -3.852451863631984E-15 4.319902276263401E-13 9.300209721505502E-15
tp -1.128949847097478E-12 3.127738072189164E-12 5.595549081549004E-9 -7.949948784723939E-12 1.09588357445237E-9 8.277703469527532E-12
node 2.070387303353396E-15 -3.852451863631984E-15 -7.949948784723939E-12 2.200539085887135E-10 -2.147108426596688E-10 -7.188409000696164E-12
peri -1.565010865934409E-13 4.319902276263401E-13 1.09588357445237E-9 -2.147108426596688E-10 4.312106148185703E-10 8.564371692310205E-12
i -3.148151208614878E-15 9.300209721505502E-15 8.277703469527532E-12 -7.188409000696164E-12 8.564371692310205E-12 1.39749102654113E-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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