Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0387582812069337 1.7123e-08  
a 3.117175266217135 1.3609e-08 au
q 2.996358910677793 5.1526e-08 au
i 16.59654955724482 3.8618e-07 deg
node 175.553605181033 1.1414e-06 deg
peri 176.9975210234025 2.3231e-05 deg
M 54.29288927670693 2.1708e-05 deg
tp 2458897.333847312831
(2020-Feb-17.83384731)
0.00012099 TDB
period 2010.204585192422
5.50
1.3164e-05
3.604e-08
d
yr
n .1790862495548133 1.1728e-09 deg/d
Q 3.237991621756477 1.4137e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3240  
   data-arc span      23332 days (63.88 yr)  
   first obs. used      1957-05-02  
   last obs. used      2021-03-19  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .38145  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 21:25:07  

Additional Information
 Earth MOID = 1.98965 au 
 Jupiter MOID = 1.9592 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 11.11   n/a MPCxxxxx  
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 12.806 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:
[Behrend, R. (2019) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-May-17 21:01 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin