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918 Itha (A919 QD)
Classification: Main-belt Asteroid          SPK-ID: 2000918
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1899726221773764 3.7083e-08  
a 2.863746751341501 1.1955e-08 au
q 2.319713271737213 1.0795e-07 au
i 12.06991962909426 4.2868e-06 deg
node 330.457584800622 1.767e-05 deg
peri 15.56504793237603 2.0326e-05 deg
M 273.50883778772 1.1495e-05 deg
tp 2459425.774725877690
(2021-Jul-30.27472588)
5.77e-05 TDB
period 1770.110348849392
4.85
1.1084e-05
3.035e-08
d
yr
n .2033771511668792 1.2736e-09 deg/d
Q 3.407780230945789 1.4226e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2713  
   data-arc span      36930 days (101.11 yr)  
   first obs. used      1919-08-23  
   last obs. used      2020-10-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41536  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:24:23  

Additional Information
 Earth MOID = 1.31427 au 
 Jupiter MOID = 2.0116 au 
 T_jup = 3.241 
[ 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 10.6   n/a MPO435704  
diameter diameter 21.561 km 0.106 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 3.47393 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Oey, J.; Colazo, C.; Mazzone, F.; Chapman, A. (2012) Minor Planet Bull. 39, 1-2.]
[Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.]
[Durech, J.; Hanus, J.; Broz, M.; Lehky, M.; et al. (2017) Icarus 304, 101-109.]
geometric albedo albedo 0.224   0.034 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

918 Itha (A919 QD)          Discovered 1919-Aug-22 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A919 QD = 1943 PB = A907 CA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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