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684 Hildburg (A909 PB)
Classification: Main-belt Asteroid          SPK-ID: 2000684
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 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03518206527886799 3.351e-08  
a 2.431681765481338 7.1454e-09 au
q 2.34613017887074 8.1383e-08 au
i 5.522416414146928 4.5334e-06 deg
node 336.3587843489694 3.7931e-05 deg
peri 290.4443085537317 7.6313e-05 deg
M 122.8022358835761 6.5989e-05 deg
tp 2458528.042978760186
(2019-Feb-13.54297876)
0.00025387 TDB
period 1385.027938803845
3.79
6.1048e-06
1.671e-08
d
yr
n .2599225545665942 1.1457e-09 deg/d
Q 2.517233352091935 7.3968e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2775  
   data-arc span      40319 days (110.39 yr)  
   first obs. used      1909-08-19  
   last obs. used      2020-01-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42839  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-28 17:36:44  

Additional Information
 Earth MOID = 1.33694 au 
 Jupiter MOID = 2.51163 au 
 T_jup = 3.500 
[ 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 10.8   n/a MPO448917  
diameter diameter 19.040 km 0.188 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 15.89 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Ferrero, A. (2014) Minor Planet Bull. 41, 184-185.]
geometric albedo albedo 0.238   0.043 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.960   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=13.18 deg.
U-B UB 0.500   0.030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=13.18 deg.

684 Hildburg (A909 PB)          Discovered 1909-Aug-08 by Kopff, A. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A909 PB = 1928 PB = 1938 CT 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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