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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 ]

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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 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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457142.5 (2015-Apr-30.0) TDB
Reference: JPL 44 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03769243889464612 1.1111e-08  
q 2.734751795839653 3.3965e-08 au
tp 2456494.031762665557
(2013-Jul-20.53176267)
0.0001594 TDB
node 142.5787983523906 2.2707e-05 deg
peri 297.4722470900323 3.9222e-05 deg
i 2.689482199881171 7.971e-07 deg
  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
 Jupiter MOID = 2.13 au 
 T_jup = 3.305 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.234465191427719E-16 -3.649450300499958E-16 1.176187717309128E-13 3.69146530513343E-14 -1.818800505937611E-14 4.926544297103257E-16
q -3.649450300499958E-16 1.153596504533783E-15 1.160701316662419E-13 -1.039556973945686E-13 1.453271388977322E-13 -1.312995895121393E-15
tp 1.176187717309128E-13 1.160701316662419E-13 2.540831995722316E-8 -8.868445308415859E-11 5.087999776828813E-9 2.758633835377081E-12
node 3.69146530513343E-14 -1.039556973945686E-13 -8.868445308415859E-11 5.156068221607731E-10 -5.345635919171191E-10 -2.608493806339066E-12
peri -1.818800505937611E-14 1.453271388977322E-13 5.087999776828813E-9 -5.345635919171191E-10 1.5383510546759E-9 3.11515922905277E-12
i 4.926544297103257E-16 -1.312995895121393E-15 2.758633835377081E-12 -2.608493806339066E-12 3.11515922905277E-12 6.353628805862618E-13

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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