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JPL Small-Body Database Browser
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1108 Demeter (1929 KA)
Classification: Main-belt Asteroid          SPK-ID: 2001108
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .257154718668944 4.3008e-08  
a 2.426935128683665 8.2329e-09 au
q 1.80283730843924 1.0686e-07 au
i 24.91645184885791 5.2779e-06 deg
node 234.2537509224128 1.0453e-05 deg
peri 78.09660609546189 1.4423e-05 deg
M 243.8574576082494 1.0446e-05 deg
tp 2459046.027490512321
(2020-Jul-15.52749051)
4.1239e-05 TDB
period 1380.974561788375
3.78
7.0271e-06
1.924e-08
d
yr
n .2606854680464183 1.3265e-09 deg/d
Q 3.051032948928091 1.035e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1792  
   data-arc span      32852 days (89.94 yr)  
   first obs. used      1929-05-31  
   last obs. used      2019-05-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39281  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-29 19:19:09  

Additional Information
 Earth MOID = .943387 au 
 Jupiter MOID = 2.4826 au 
 T_jup = 3.341 
[ 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 11.9   n/a MPO473778 IRAS observations used: 4
diameter diameter 25.285 km 0.057 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 9.846 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Published Reference List:
[Behrend, R. (2001) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Stephens, R.D. (2002) Minor Planet Bull. 29, 2-3.]
[Polakis, T.; Skiff, B.A. (2016) Minor Planet Bull. 43, 310.]
[Brines, P.; Lozano, J.; Rodrigo, O.; Fornas, A.; et al. (2017) Minor Planet Bull. 44, 145-149.]
geometric albedo albedo 0.031   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.681   0.029 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=17.46 deg.
U-B UB 0.308   0.047 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=17.46 deg.
Tholen spectral type spec_T CX   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices

1108 Demeter (1929 KA)          Discovered 1929-May-31 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1929 KA = 1963 MF 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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