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JPL Small-Body Database Browser
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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 98 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07248560070837586 4.3392e-08  
a 2.650767958428713 9.4576e-09 au
q 2.458625450623493 1.1322e-07 au
i 10.92618376597009 4.7105e-06 deg
node 286.3415553984038 1.8988e-05 deg
peri .8973297364739004 3.2016e-05 deg
M 145.1239086666508 2.6745e-05 deg
tp 2457965.033791515373
(2017-Jul-30.53379152)
0.0001159 TDB
period 1576.362138784071
4.32
8.4364e-06
2.31e-08
d
yr
n .2283739193823105 1.2222e-09 deg/d
Q 2.842910466233933 1.0143e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2224  
   data-arc span      42971 days (117.65 yr)  
   first obs. used      1901-08-17  
   last obs. used      2019-04-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46846  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-29 19:08:12  

Additional Information
 Earth MOID = 1.4416 au 
 Jupiter MOID = 2.305 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 8.55   n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 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-January); 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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