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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 54 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02959087946527751 3.2978e-08  
a 2.284635838217481 4.9749e-09 au
q 2.217031454506734 7.5173e-08 au
i 3.801712513876358 3.7814e-06 deg
node 29.17080487106625 4.7861e-05 deg
peri 193.9547503406249 7.5241e-05 deg
M 73.72736073080668 5.7725e-05 deg
tp 2458742.184723160779
(2019-Sep-15.68472316)
0.00020228 TDB
period 1261.315999112694
3.45
4.1198e-06
1.128e-08
d
yr
n .2854161845669534 9.3225e-10 deg/d
Q 2.352240221928227 5.1221e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3304  
   data-arc span      50456 days (138.14 yr)  
   first obs. used      1882-09-09  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40779  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:32:15  

Additional Information
 Earth MOID = 1.2079 au 
 Jupiter MOID = 2.61027 au 
 T_jup = 3.599 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456047.5 (2012-Apr-30.0) TDB
Reference: JPL 54 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02945353404687022 3.2921e-08  
q 2.216569087195137 7.4949e-08 au
tp 2456222.341036217612
(2012-Oct-21.84103622)
0.00020381 TDB
node 29.25480223317536 4.7843e-05 deg
peri 194.4150105903925 7.5497e-05 deg
i 3.803296711353654 3.7817e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3304  
   data-arc span      50456 days (138.14 yr)  
   first obs. used      1882-09-09  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40779  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:32:15  

Additional Information
 Jupiter MOID = 2.61027 au 
 T_jup = 3.599 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.083801287910937E-15 -2.462450138613441E-15 -1.090097783948681E-12 -1.449910588274393E-15 -3.144013844844999E-13 -3.52499134709339E-17
q -2.462450138613441E-15 5.617422949078234E-15 2.40944609959148E-12 3.043759440717454E-15 6.93858797080791E-13 1.116633929140073E-16
tp -1.090097783948681E-12 2.40944609959148E-12 4.153787599948761E-8 5.168881165098451E-12 1.191053436081652E-8 -2.561314307059994E-13
node -1.449910588274393E-15 3.043759440717454E-15 5.168881165098451E-12 2.288914310101653E-9 -2.282012638564751E-9 -1.575179169234175E-11
peri -3.144013844844999E-13 6.93858797080791E-13 1.191053436081652E-8 -2.282012638564751E-9 5.699807735331772E-9 1.564621233892349E-11
i -3.52499134709339E-17 1.116633929140073E-16 -2.561314307059994E-13 -1.575179169234175E-11 1.564621233892349E-11 1.430142159362766E-11

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

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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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