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

Significant website upgrade scheduled for September 27. More details available here.

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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 108 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1246427649142289 1.7466e-08  
a 2.850103035710216 6.2913e-09 au
q 2.494858313048857 4.7089e-08 au
i 13.58063881037137 4.5267e-07 deg
node 344.8549226374612 2.5083e-06 deg
peri 188.9646212130534 6.7419e-06 deg
M 173.2323240923833 5.7552e-06 deg
tp 2458550.801229656780
(2019-Mar-08.30122966)
2.7075e-05 TDB
period 1757.475453375536
4.81
5.8192e-06
1.593e-08
d
yr
n .2048392763088427 6.7824e-10 deg/d
Q 3.205347758371574 7.0755e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2543  
   data-arc span      46542 days (127.43 yr)  
   first obs. used      1894-03-05  
   last obs. used      2021-08-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48754  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 06:33:30  

Additional Information
 Earth MOID = 1.50227 au 
 Jupiter MOID = 1.77451 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. 2020-October); 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 1.78945962003396 1.78945930452069 1.78945993555262 3.89837886505893 3.77500703534301 2420851.263670632 0.79397586161331 221.457716458349 11.7663360394161 87.098320043947 21213279.8886794 T 108 CATAB v2.0g-lin.ifort 2021-Aug-25 06:34:51 2021-Aug-25 06:34
1940-Mar-09 23:17 < 00:01 Jupiter 1.89519075537857 1.89519035364865 1.89519115710936 3.58662215269544 3.45976780839641 2429698.470168209 0.629284798137571 95.0005372745163 14.2779067648209 80.5526307391441 14923015.7910894 T 108 CATAB v2.0g-lin.ifort 2021-Aug-25 06:34:51 2021-Aug-25 06:34
2045-Feb-25 14:30 < 00:01 Jupiter 1.96299744391716 1.96299714812535 1.96299773971009 4.19714368484592 4.09304607870009 2468037.104179450 0.285768192314058 78.4783757421043 2.77393709787565 79.7827082318008 23158926.6837366 T 108 CATAB v2.0g-lin.ifort 2021-Aug-25 06:34:51 2021-Aug-25 06:34
2069-May-19 21:43 < 00:01 Jupiter 1.813766789006 1.81376648580235 1.81376709221626 4.14086469996587 4.02650812967138 2476886.404816907 0.477129049531537 176.786942217977 1.68023889018611 85.3691794581546 25975241.4808114 T 108 CATAB v2.0g-lin.ifort 2021-Aug-25 06:34:51 2021-Aug-25 06:34
2093-Jul-28 10:03 < 00:01 Jupiter 1.76825724390119 1.76825708474581 1.76825740306322 3.99884464976891 3.87720616745667 2485721.918546445 0.696350708870263 191.086326122014 3.39514019445118 88.1988641578175 22612152.3416894 T 108 CATAB v2.0g-lin.ifort 2021-Aug-25 06:34:51 2021-Aug-25 06:34
2117-Oct-06 21:58 00:01 Jupiter 1.81105551990216 1.81105523116164 1.81105580866399 3.73730369988089 3.60999279106271 2494557.415177372 1.00550048953555 352.603456766279 8.55249396367215 87.6540662872015 9326840.45212027 T 108 CATAB v2.0g-lin.ifort 2021-Aug-25 06:34:51 2021-Aug-25 06:34
2142-Jan-06 15:17 00:01 Jupiter 1.93732670215923 1.93732594390829 1.93732746041346 3.30084421826832 3.16561976922544 2503415.136931994 1.4516232374805 137.946500147567 10.099172416597 71.6362929955351 12668401.0984661 T 108 CATAB v2.0g-lin.ifort 2021-Aug-25 06:34:51 2021-Aug-25 06:34

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 2021-Sep-22 12:40 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin