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JPL Small-Body Database Browser
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2540 Blok (1971 TH2)
Classification: Main-belt Asteroid          SPK-ID: 2002540
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05102731039593233 4.3017e-08  
a 2.196971887716356 5.9978e-09 au
q 2.084866321270717 9.3896e-08 au
i 1.265757982029346 3.5739e-06 deg
node 183.5162679945586 0.00019598 deg
peri 261.3850984781426 0.00019923 deg
M 147.345567009998 3.6873e-05 deg
tp 2458113.678500107550
(2017-Dec-26.17850011)		 0.0001212 TDB
period 1189.419834730353
3.26		 4.8707e-06
1.334e-08		 d
yr
n .3026685695733447 1.2394e-09 deg/d
Q 2.309077454161997 6.3038e-09 au
   Orbit Determination Parameters
   # obs. used (total)      2156  
   data-arc span      25367 days (69.45 yr)  
   first obs. used      1950-03-08  
   last obs. used      2019-08-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44167  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-23 19:25:28  

Additional Information
 Earth MOID = 1.10131 au 
 Jupiter MOID = 2.77234 au 
 T_jup = 3.666 
[ 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 13.1   n/a MPO389604  
diameter diameter 5.671 km 0.122 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 19.20 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 [Result based on fragmentary lightcurve(s), may be completely wrong.]
geometric albedo albedo 0.302   0.033 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

2540 Blok (1971 TH2)          Discovered 1971-Oct-13 by Chernykh, L. at Nauchnyj
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1971 TH2 = 1950 ED = 1957 JQ = 1960 FK = 1968 UZ = 1980 LN = 1981 UQ 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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