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JPL Small-Body Database Browser
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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 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2064243161529974 4.4294e-08  
a 2.679632665063284 9.7265e-09 au
q 2.126491324636361 1.1978e-07 au
i 12.48685832022712 4.2679e-06 deg
node 334.2638273720794 1.9531e-05 deg
peri 217.3693645068139 2.153e-05 deg
M 357.6949316061878 1.1856e-05 deg
tp 2459010.758707255503
(2020-Jun-10.25870726)
5.2793e-05 TDB
period 1602.180057604739
4.39
8.7234e-06
2.388e-08
d
yr
n .2246938465444391 1.2234e-09 deg/d
Q 3.232774005490207 1.1734e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2371  
   data-arc span      41597 days (113.89 yr)  
   first obs. used      1906-03-18  
   last obs. used      2020-02-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .38438  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:31:37  

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.DBLast 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 ]
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