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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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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03594405959383085 1.1169e-08  
a 2.843955988701783 9.2097e-09 au
q 2.741732665161654 3.3937e-08 au
i 2.690093287963491 7.9736e-07 deg
node 142.549674620681 2.2868e-05 deg
peri 296.2484380906479 4.078e-05 deg
M 197.9044067700028 3.5787e-05 deg
tp 2459989.271919372232
(2023-Feb-13.77191937)
0.00017579 TDB
period 1751.792786686656
4.80
8.5093e-06
2.33e-08
d
yr
n .2055037574854414 9.9824e-10 deg/d
Q 2.946179312241913 9.5407e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3214  
   data-arc span      26006 days (71.20 yr)  
   first obs. used      1949-07-28  
   last obs. used      2020-10-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42204  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 12:57:43  

Additional Information
 Earth MOID = 1.75812 au 
 Jupiter MOID = 2.13272 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 11.75   n/a E2021B10  
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

[ 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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