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153 Hilda
Classification: Outer Main-belt Asteroid          SPK-ID: 2000153
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1390788425779754 4.4072e-08  
a 3.975359033200827 3.3866e-08 AU
q 3.422470700031356 1.8344e-07 AU
i 7.826419432476071 5.2332e-06 deg
node 228.1787754637794 3.5661e-05 deg
peri 38.59376350138884 3.9962e-05 deg
M 337.145762148603 2.1808e-05 deg
tp 2457184.292254837950
(2015-Jun-10.79225484)
0.00017644 JED
period 2895.095963028034
7.93
3.6995e-05
1.013e-07
d
yr
n .1243482097303156 1.589e-09 deg/d
Q 4.528247366370297 3.8576e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1558  
   data-arc span      43632 days (119.46 yr)  
   first obs. used      1895-03-30  
   last obs. used      2014-09-14  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .58016  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Mar-09 13:26:28  

Additional Information
 Earth MOID = 2.41321 AU 
 T_jup = 3.024 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 7.48 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 19
diameter diameter 170.63 km 3.3 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 19
rotation period rot_per 5.9587 h n/a LCDB (Rev. 2015-Feb); Warner et al., 2009 Published Reference List:
[Shevchenko, V.G.; Tungalag, N.; Chiorny, V.G.; Gaftonyuk, N.M.; et al. (2008) ACM 2008, 8106.]
[Shevchenko, V.G.; Tungalag, N.; Chiorny, V.G.; Gaftonyuk, N.M.; et al. (2009) Plan. Space Sci. 57, 1514-1520.]
geometric albedo albedo 0.0618   0.002 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 19
B-V BV .669 mag .020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=6; phase (min.=2.32, mean=7.15, max.=12.62) deg.
U-B UB .243 mag .035 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=6; phase (min.=2.32, mean=7.15, max.=12.62) 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)

153 Hilda          Discovered 1875-Nov-02 by Palisa, J. at Pola
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1935 GD 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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