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1802 Zhang Heng (1964 TW1)
Classification: Main-belt Asteroid          SPK-ID: 2001802
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 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03655317582487581 3.2049e-08  
a 2.842308516224979 9.4983e-09 au
q 2.738413113282865 9.1241e-08 au
i 2.689719134876795 2.9007e-06 deg
node 142.5645354588607 8.2716e-05 deg
peri 296.2707345628892 9.5403e-05 deg
M 156.7438058943863 4.8571e-05 deg
tp 2458238.433030574026
(2018-Apr-29.93303057)
0.00023482 TDB
period 1750.270815665936
4.79
8.7735e-06
2.402e-08
d
yr
n .2056824559821211 1.031e-09 deg/d
Q 2.946203919167092 9.8455e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3175  
   data-arc span      26006 days (71.20 yr)  
   first obs. used      1949-07-28  
   last obs. used      2020-10-09  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42176  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:15:19  

Additional Information
 Earth MOID = 1.75525 au 
 Jupiter MOID = 2.13518 au 
 T_jup = 3.306 
[ 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 11.7   n/a MPO347531  
diameter diameter 13.333 km 0.110 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 3.162 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:
[Simpson, G.; Chong, E.; Gerhardt, M.; Gorsky, S.; et al. (2013) Minor Planet Bull. 146-151.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
[Mannucci, M.; Montigiani, N. (2019) Minor Planet Bull. 46, 277-278.]
geometric albedo albedo 0.228   0.026 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

1802 Zhang Heng (1964 TW1)          Discovered 1964-Oct-09 by Purple Mountain Observatory at Nanking
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1964 TW1 = 1933 FH = 1936 YB = 1938 EB1 = 1948 JN = 1949 OV = 1955 YB = 1972 JX 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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