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JPL Small-Body Database Browser
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4112 Hrabal (1981 ST)
Classification: Main-belt Asteroid          SPK-ID: 2004112
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03866914470075546 3.5484e-08  
a 3.116585814056263 1.6587e-08 au
q 2.996070106240199 1.1305e-07 au
i 16.59756032232965 4.0346e-06 deg
node 175.5559896735206 1.2054e-05 deg
peri 176.7182337593817 4.7663e-05 deg
M 18.73701903219881 4.5437e-05 deg
tp 2458895.904004350955
(2020-Feb-16.40400435)
0.00025372 TDB
period 2009.634423114393
5.50
1.6044e-05
4.393e-08
d
yr
n .1791370588895949 1.4301e-09 deg/d
Q 3.237101521872326 1.7229e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2619  
   data-arc span      22894 days (62.68 yr)  
   first obs. used      1957-05-02  
   last obs. used      2020-01-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40227  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 17:04:33  

Additional Information
 Earth MOID = 1.99107 au 
 Jupiter MOID = 1.9604 au 
 T_jup = 3.152 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 11.1   n/a MPO502192  
diameter diameter 45.507 km 0.071 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 9.298 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:
[Ditteon, R.; Adam, A.; Doyel, M.; Gibson, J.; et al. (2018) Minor Planet Bull. 45, 13-16.]
geometric albedo albedo 0.026   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

4112 Hrabal (1981 ST)          Discovered 1981-Sep-25 by Mahrova, M. at Klet
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1981 ST = 1957 JA = 1968 HL1 = 1987 UV 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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