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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 44 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03487905031065599 1.1059e-08  
a 2.84656016052566 9.0767e-09 au
q 2.747274845474376 3.3891e-08 au
i 2.691620777416872 7.9713e-07 deg
node 142.5336228429403 2.2661e-05 deg
peri 295.9258865720149 4.1228e-05 deg
M 238.4384373488366 3.633e-05 deg
tp 2459988.842304404506
(2023-Feb-13.34230440)
0.00017821 TDB
period 1754.199476668058
4.80
8.3903e-06
2.297e-08
d
yr
n .2052218147298659 9.8157e-10 deg/d
Q 2.945845475576943 9.3932e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3453  
   data-arc span      26310 days (72.03 yr)  
   first obs. used      1949-07-28  
   last obs. used      2021-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .41397  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 08:04:58  

Additional Information
 Earth MOID = 1.76391 au 
 Jupiter MOID = 2.13 au 
 T_jup = 3.305 
[ 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 11.76   n/a MPO636089  
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 3.161 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 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.]
[Carreño, A.; Fornas, G.; Arce, E.; Mas, V. (2020) Minor Planet Bull. 47, 7-10.]
[Erasmus, N.; Navarro-Meza, S.; McNeill, A.; Trilling, D.E.; et al. (2020) Ap. J. Suppl. Ser. 247, A13.]
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

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 ]
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