Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
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 ]

[ hide orbit diagram ]

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.


[ revert to old Java-based viewer ]

Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03655317642951848 3.2071e-08  
a 2.842308515983607 9.5956e-09 au
q 2.738413111331736 9.1341e-08 au
i 2.689718903394021 3.0645e-06 deg
node 142.5645319329824 8.3485e-05 deg
peri 296.2707397999529 9.6695e-05 deg
M 156.7438043462169 4.9614e-05 deg
tp 2458238.433038198087
(2018-Apr-29.93303820)
0.00024003 TDB
period 1750.270815442984
4.79
8.8633e-06
2.427e-08
d
yr
n .2056824560083212 1.0416e-09 deg/d
Q 2.946203920635479 9.9463e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3010  
   data-arc span      25893 days (70.89 yr)  
   first obs. used      1949-07-28  
   last obs. used      2020-06-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43016  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:36:45  

Additional Information
 Earth MOID = 1.75525 au 
 Jupiter MOID = 2.13518 au 
 T_jup = 3.306 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456729.5 (2014-Mar-13.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03790813876121756 3.1784e-08  
q 2.736407082461352 9.0883e-08 au
tp 2456499.876689387413
(2013-Jul-26.37668939)
0.00023166 TDB
node 142.5754502356783 8.3524e-05 deg
peri 298.7664469284207 9.6108e-05 deg
i 2.688453630339252 3.0633e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3010  
   data-arc span      25893 days (70.89 yr)  
   first obs. used      1949-07-28  
   last obs. used      2020-06-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43016  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:36:45  

Additional Information
 Jupiter MOID = 2.13518 au 
 T_jup = 3.306 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.010196089499067E-15 -2.873335779036454E-15 -1.729298692129286E-12 1.593526898676243E-16 -3.664873356394226E-13 2.337669679536394E-16
q -2.873335779036454E-15 8.259671810531757E-15 5.468108060596227E-12 -1.718644516002819E-15 1.156822446905023E-12 -6.590594188747553E-16
tp -1.729298692129286E-12 5.468108060596227E-12 5.366698758790876E-8 -2.384452351748157E-11 1.103851586057648E-8 -8.201751564288267E-13
node 1.593526898676243E-16 -1.718644516002819E-15 -2.384452351748157E-11 6.976238144243327E-9 -6.973145842445575E-9 3.293441326636043E-11
peri -3.664873356394226E-13 1.156822446905023E-12 1.103851586057648E-8 -6.973145842445575E-9 9.236820082351767E-9 -3.306778163219552E-11
i 2.337669679536394E-16 -6.590594188747553E-16 -8.201751564288267E-13 3.293441326636043E-11 -3.306778163219552E-11 9.383722606502311E-12

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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Aug-09 16:09 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin