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176 Iduna
Classification: Main-belt Asteroid          SPK-ID: 2000176
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1660947029795032 3.2913e-08  
a 3.187959278266737 1.3352e-08 AU
q 2.658456128832272 1.0484e-07 AU
i 22.58511396107539 3.7877e-06 deg
node 200.6586460227444 1.1485e-05 deg
peri 187.60988315959 1.7209e-05 deg
M 61.93234647127687 1.2292e-05 deg
tp 2456642.829922587886
(2013-Dec-16.32992259)
7.0671e-05 JED
period 2079.062641814776
5.69
1.3061e-05
3.576e-08
d
yr
n .173154955872692 1.0878e-09 deg/d
Q 3.717462427701202 1.557e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1537  
   data-arc span      50204 days (137.45 yr)  
   first obs. used      1877-10-15  
   last obs. used      2015-03-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .5778  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Apr-07 15:58:45  

Additional Information
 Earth MOID = 1.66364 AU 
 T_jup = 3.058 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 8.2 mag n/a MPO263344  
diameter diameter 121.04 km 2.2 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 36
rotation period rot_per 11.2877 h n/a LCDB (Rev. 2015-May); Warner et al., 2009 Published Reference List:
[Hansen, A.T.; Arentoft, T. (1997) Minor Planet Bul. 24, 14.]
[Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2007) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Krajewski, R. (2008) Minor Planet Bul. 35, 77.]
[Warner, B.D. (2008) Minor Planet Bul. 35, 56-60.]
[Alton, K.B. (2008) Minor Planet Bul. 35, 53.]
geometric albedo albedo 0.0834   0.003 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 36
Tholen spectral type spec_T G   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a medium resolution spectrum published by Chapman and Gaffey (1979)
SMASSII spectral type spec_B Ch   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

176 Iduna          Discovered 1877-Oct-14 by Peters, C. H. F. at Clinton
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1945 RQ 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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