+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   591 Irmgard (A906 EE) Classification: Main-belt Asteroid          SPK-ID: 2000591 [ 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 39 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2064243167154056 4.4074e-08   a 2.67963266809468 8.3882e-09 au q 2.126491325534956 1.1924e-07 au i 12.48685807246171 4.2362e-06 deg node 334.2638375036724 1.7304e-05 deg peri 217.3693575324596 1.9106e-05 deg M 357.6949268213922 8.8763e-06 deg tp 2459010.758728567644 (2020-Jun-10.25872857) 3.9514e-05 TDB period 1602.180060323494 4.39 7.5231e-06 2.06e-08 d yr n .224693846163154 1.0551e-09 deg/d Q 3.232774010654404 1.012e-08 au   Orbit Determination Parameters    # obs. used (total)      2709      data-arc span      41729 days (114.25 yr)      first obs. used      1906-03-18      last obs. used      2020-06-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .36721      source      ORB      producer      Otto Matic      solution date      2020-Jun-23 15:17:05   Additional Information  Earth MOID = 1.14235 au   Jupiter MOID = 1.80595 au   T_jup = 3.313  [ 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 10.7   n/a MPO502158 IRAS observations used: 23 diameter diameter 51.86 km 1.3 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 23 rotation period rot_per 7.35 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List: [Lagerkvist, C.-I.; Hahn, G.; Magnusson, P.; Rickman, H. (1987) Astron. Astrophys. Suppl. Ser. 70, 21-32.] [Behrend, R. (2009) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] geometric albedo albedo 0.0364   0.002 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 23 B-V BV 0.693   0.021 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=3.65, mean=4.53, max.=5.43) deg. U-B UB 0.299   0.092 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=3.65, mean=4.53, max.=5.43) deg. Tholen spectral type spec_T X   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices 591 Irmgard (A906 EE)          Discovered 1906-Mar-14 by Kopff, A. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A906 EE = 1954 EM = 1955 ML1  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Aug-03 07:03 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin