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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 52 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03486435847211711 1.9722e-08  
a 2.432460620374789 6.0632e-09 au
q 2.347654441336734 4.7179e-08 au
i 5.522473585967982 1.2721e-06 deg
node 336.3536886866428 4.4764e-06 deg
peri 290.6957388721156 3.3701e-05 deg
M 225.4466880077629 3.1757e-05 deg
tp 2459914.415663267977
(2022-Nov-30.91566327)
0.00012208 TDB
period 1385.693417841908
3.79
5.181e-06
1.418e-08
d
yr
n .2597977268021288 9.7136e-10 deg/d
Q 2.517266799412844 6.2746e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3292  
   data-arc span      40821 days (111.76 yr)  
   first obs. used      1909-08-19  
   last obs. used      2021-05-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .40922  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 11:25:50  

Additional Information
 Earth MOID = 1.33828 au 
 Jupiter MOID = 2.50931 au 
 T_jup = 3.499 
[ 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 10.92   n/a MPCxxxxx  
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. 2020-October); 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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