Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
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 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 
[ 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

[ 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 1.78945952313404 1.7894590413264 1.78946000497505 3.8983772912876 3.77500540265641 2420851.263850700 0.941618307504436 676.372760696359 17.8875392515675 88.6922450829027 3660429.5356552 T 97 CATAB v2.0f-lin.ifort 2020-Aug-24 22:15:31 2020-Aug-24 22:15
1940-Mar-09 23:17 < 00:01 Jupiter 1.89519076076276 1.89519019350284 1.89519132802376 3.58662085472269 3.4597664624861 2429698.470330909 0.733710251038641 277.256686015518 27.8222931819652 -88.645396046768 3659788.51309385 T 97 CATAB v2.0f-lin.ifort 2020-Aug-24 22:15:31 2020-Aug-24 22:15
2045-Feb-25 14:30 < 00:01 Jupiter 1.96299723533215 1.96299674544058 1.96299772522617 4.197141754788 4.09304408777109 2468037.104099223 0.421865979250554 172.85728888372 15.4249904389386 84.1969020058387 3770661.4852859 T 97 CATAB v2.0f-lin.ifort 2020-Aug-24 22:15:31 2020-Aug-24 22:15
2069-May-19 21:43 < 00:01 Jupiter 1.81376660712004 1.81376613214396 1.81376708210963 4.14086296978895 4.02650633808448 2476886.404670781 0.646482959169961 335.47632605948 12.1347634695606 86.8099314893699 3563579.78814195 T 97 CATAB v2.0f-lin.ifort 2020-Aug-24 22:15:31 2020-Aug-24 22:15
2093-Jul-28 10:02 < 00:01 Jupiter 1.7682570281676 1.76825664461462 1.76825741173626 3.99884324413624 3.87720470196984 2485721.918323552 0.92103814194688 398.459632485621 11.145894214113 88.0438525502844 3488583.49190691 T 97 CATAB v2.0f-lin.ifort 2020-Aug-24 22:15:31 2020-Aug-24 22:15
2117-Oct-06 21:57 00:01 Jupiter 1.81105523301548 1.81105465893954 1.81105580719489 3.73730284111635 3.6099918807743 2494557.414878557 1.3145389297932 1042.83075484663 20.1930614680947 88.7765351665473 3496098.29461443 T 97 CATAB v2.0f-lin.ifort 2020-Aug-24 22:15:31 2020-Aug-24 22:15
2142-Jan-06 15:17 00:02 Jupiter 1.93732628855794 1.93732517739903 1.9373273997196 3.30084408907033 3.16561960425981 2503415.136513901 1.87698791016656 219.722598906759 50.1490205082628 80.0119107809006 3424668.06685383 T 97 CATAB v2.0f-lin.ifort 2020-Aug-24 22:15:31 2020-Aug-24 22:15

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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Oct-23 12:26 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin