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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 96 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1225886960946882 4.195e-08  
a 2.852932181504933 7.322e-09 au
q 2.503194945327669 1.1766e-07 au
i 13.55069991875365 3.7771e-06 deg
node 344.9424111032872 1.4944e-05 deg
peri 188.6975911406236 2.1203e-05 deg
M 92.55812393947204 1.5687e-05 deg
tp 2458547.969723092785
(2019-Mar-05.46972309)
7.6645e-05 TDB
period 1760.092931368532
4.82
6.7758e-06
1.855e-08
d
yr
n .2045346547242183 7.874e-10 deg/d
Q 3.202669417682197 8.2196e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2194  
   data-arc span      46125 days (126.28 yr)  
   first obs. used      1894-03-05  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50796  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:13:03  

Additional Information
 Earth MOID = 1.50978 au 
 Jupiter MOID = 1.77848 au 
 T_jup = 3.253 
[ 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 7.6   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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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 1.78945951976344 1.78945903730876 1.78946000225199 3.89837727063495 3.77500538109263 2420851.263856202 0.943766072153221 680.368102166088 17.9023218971655 88.6986604798414 3638643.47641586 T 96 CATAB v2.0f-lin.ifort 2020-Jun-23 15:13:16 2020-Jun-23 15:13
1940-Mar-09 23:17 < 00:01 Jupiter 1.89519075952329 1.8951901921383 1.89519132690936 3.58662085391044 3.45976646155958 2429698.470330957 0.734841727523979 277.852695279 27.8247621394344 -88.6479187582073 3640441.44365871 T 96 CATAB v2.0f-lin.ifort 2020-Jun-23 15:13:16 2020-Jun-23 15:13
2045-Feb-25 14:30 < 00:01 Jupiter 1.96299723534152 1.9629967453233 1.96299772536229 4.19714173537539 4.09304406786527 2468037.104090760 0.42467868183975 172.900196607997 15.4443604666801 84.2016405380107 3763790.48738782 T 96 CATAB v2.0f-lin.ifort 2020-Jun-23 15:13:16 2020-Jun-23 15:13
2069-May-19 21:43 < 00:01 Jupiter 1.81376660457697 1.81376612938737 1.81376707978009 4.14086295076693 4.02650631835959 2476886.404665267 0.649974049269791 335.792050157306 12.1566398493125 86.8140556786205 3554633.08908482 T 96 CATAB v2.0f-lin.ifort 2020-Jun-23 15:13:16 2020-Jun-23 15:13
2093-Jul-28 10:02 < 00:01 Jupiter 1.76825702147593 1.76825663535161 1.76825740761593 3.99884319386318 3.87720464965203 2485721.918322743 0.925953972039274 399.417027325932 11.2502392739198 88.0367457398189 3477561.28660339 T 96 CATAB v2.0f-lin.ifort 2020-Jun-23 15:13:16 2020-Jun-23 15:13
2117-Oct-06 21:57 00:01 Jupiter 1.81105522030939 1.8110546396669 1.81105580105884 3.73730281748508 3.6099918554007 2494557.414868783 1.32156456313213 1052.44550024757 20.2713224760908 88.7680122631724 3477671.17928499 T 96 CATAB v2.0f-lin.ifort 2020-Jun-23 15:13:16 2020-Jun-23 15:13
2142-Jan-06 15:17 00:02 Jupiter 1.93732626848801 1.93732514889239 1.9373273880865 3.30084422821022 3.1656197479125 2503415.136478384 1.8865342126857 220.07446340023 50.4093005751142 79.9330538334854 3407660.88527804 T 96 CATAB v2.0f-lin.ifort 2020-Jun-23 15:13:16 2020-Jun-23 15:13

Alternate Designations
 A894 EA = 1942 FQ = 1953 TQ = 1987 QG3 = A918 CC 
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