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207 Hedda (A879 UA)
Classification: Main-belt Asteroid          SPK-ID: 2000207
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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 53 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02959086650964968 3.5059e-08  
a 2.284635839873106 5.201e-09 au
q 2.21703148571226 8.045e-08 au
i 3.801712773689194 3.9698e-06 deg
node 29.17080785263453 4.8506e-05 deg
peri 193.95474264974 7.5721e-05 deg
M 73.72736375942796 5.777e-05 deg
tp 2458742.184712268740
(2019-Sep-15.68471227)
0.00020245 TDB
period 1261.316000483767
3.45
4.3071e-06
1.179e-08
d
yr
n .2854161842567011 9.7464e-10 deg/d
Q 2.352240194033953 5.3549e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3099  
   data-arc span      50365 days (137.89 yr)  
   first obs. used      1882-09-09  
   last obs. used      2020-08-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41683  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:12:02  

Additional Information
 Earth MOID = 1.2079 au 
 Jupiter MOID = 2.61027 au 
 T_jup = 3.599 
[ 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 10.1   n/a MPO473763 IRAS observations used: 9
diameter diameter 57.880 km 0.149 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 30.098 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Pilcher, F. (2010) Minor Planet Bull. 37, 21-24.]
geometric albedo albedo 0.058   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.722   0.032 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=4.97, mean=8.10, max.=11.23) deg.
U-B UB 0.389   0.030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=4.97, mean=8.10, max.=11.23) deg.
Tholen spectral type spec_T C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices
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)

207 Hedda (A879 UA)          Discovered 1879-Oct-17 by Palisa, J. at Pola
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A879 UA = 1932 CL1 = 1934 XJ = 1953 BF 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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