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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 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 
[ show covariance matrix ]

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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1915-Dec-19 18:20 00:01 Jupiter 1.78945952350698 1.78945900265725 1.78946004439079 3.89837704703363 3.77500515044605 2420851.263972751 1.13750836878064 712.483173031177 20.3498665931052 88.7324450059482 3459948.46542805 T 93 CATAB v2.0e-lin.ifort 2019-May-29 19:07:00 2019-May-29 19:07
1940-Mar-09 23:17 < 00:01 Jupiter 1.89519075674067 1.89519013686143 1.89519137662045 3.58662075791293 3.4597663618526 2429698.470401847 0.877140837763381 293.304293874127 31.3583819192364 -89.2471518494633 3526787.91830853 T 93 CATAB v2.0e-lin.ifort 2019-May-29 19:07:00 2019-May-29 19:07
2045-Feb-25 14:30 < 00:01 Jupiter 1.96299732170261 1.96299677615452 1.96299786725394 4.19714164195536 4.09304397670727 2468037.104047473 0.520155597815897 185.167832674101 16.617996385822 83.7635892819511 3563880.89743641 T 93 CATAB v2.0e-lin.ifort 2019-May-29 19:07:00 2019-May-29 19:07
2069-May-19 21:43 < 00:01 Jupiter 1.8137666582423 1.81376613528871 1.8137671812125 4.14086290943877 4.02650627928928 2476886.404603371 0.796311983140743 361.44761194765 12.8473210665498 86.6765239633222 3386663.26096712 T 93 CATAB v2.0e-lin.ifort 2019-May-29 19:07:00 2019-May-29 19:07
2093-Jul-28 10:02 00:01 Jupiter 1.7682570083129 1.76825659627272 1.76825742037017 3.99884327588642 3.87720473332889 2485721.918231922 1.13573973732477 422.150376156289 12.5309611025454 88.0742666552194 3322737.0878789 T 93 CATAB v2.0e-lin.ifort 2019-May-29 19:07:00 2019-May-29 19:07
2117-Oct-06 21:57 00:02 Jupiter 1.81105511371266 1.81105442436399 1.81105580321277 3.73730306794729 3.60999210707026 2494557.414738435 1.62261284823441 1164.02389077847 22.8545441563637 88.6022972473191 3314846.58862109 T 93 CATAB v2.0e-lin.ifort 2019-May-29 19:07:00 2019-May-29 19:07
2142-Jan-06 15:16 00:02 Jupiter 1.93732604883819 1.93732468021149 1.93732741746996 3.30084468859626 3.16562021230574 2503415.136286830 2.31550140031339 251.496021380095 55.6583346766856 77.5282779699844 3314358.65849183 T 93 CATAB v2.0e-lin.ifort 2019-May-29 19:07:00 2019-May-29 19:07

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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