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476 Hedwig (A901 QB)
Classification: Main-belt Asteroid          SPK-ID: 2000476
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 105 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07265950968534121 3.9819e-08  
a 2.650244595560189 8.1082e-09 au
q 2.457679122700561 1.051e-07 au
i 10.92696956402873 4.3473e-06 deg
node 286.3417336205018 1.6898e-05 deg
peri 1.092174705745697 2.9367e-05 deg
M 236.2661636229456 2.5838e-05 deg
tp 2459542.143256990782
(2021-Nov-23.64325699)
0.00011441 TDB
period 1575.895310660888
4.31
7.232e-06
1.98e-08
d
yr
n .2284415706834141 1.0484e-09 deg/d
Q 2.842810068419818 8.6974e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2794  
   data-arc span      43402 days (118.83 yr)  
   first obs. used      1901-08-17  
   last obs. used      2020-06-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43982  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:14:52  

Additional Information
 Earth MOID = 1.44129 au 
 Jupiter MOID = 2.3065 au 
 T_jup = 3.361 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 8.6   n/a MPO502157 IRAS observations used: 10
diameter diameter 138.493 km 0.975 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 27.33 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Schober, H.J.; Schroll, A. (1985) Astron. Astrophys. Suppl. Ser. 62, 2, 187-189.]
[Marciniak, A.; Pilcher, F.; Oszkiewicz, D.; Santana-Ros, T.; et al. (2015) Planet. Space Sci. 118, 256-266.]
[Behrend, R. (2018) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.035   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.716   0.027 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=8.74, mean=11.59, max.=14.43) deg.
U-B UB 0.375   0.029 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=8.74, mean=11.59, max.=14.43) deg.
Tholen spectral type spec_T P   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B X   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)

476 Hedwig (A901 QB)          Discovered 1901-Aug-17 by Carnera, L. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A901 QB = 1974 PL 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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