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 
[ 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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1956-Feb-09 07:08 < 00:01 Psych 0.0477149059551324 0.0477109291767211 0.0477188828617038 2.44271249880025 2.44271239499323 2435512.796943672 0.506887073287776 235.263483689648 48.8587693370865 -33.5270562835994 84359.7531006476 T 36 CATAB v2.0f-lin.ifort 2020-Jun-23 15:36:59 2020-Jun-23 15:37
2072-Apr-28 13:01 < 00:01 Juno 0.0358481486585958 0.035842907374147 0.0358533900420303 5.1524476523205 5.15244758645383 2477961.042578423 0.773006662013305 277.893130405304 35.8095421699708 20.1217768646513 54578.2610622303 T 36 CATAB v2.0f-lin.ifort 2020-Jun-23 15:36:59 2020-Jun-23 15:37
2184-Feb-02 00:25 < 00:01 Psych 0.0420767717826927 0.0420654447971408 0.0420881011318465 2.38380599531713 2.38380587469143 2518781.517665378 0.715987621015991 752.594178432517 51.3778183555404 41.5944382063447 81365.8265349261 T 36 CATAB v2.0f-lin.ifort 2020-Jun-23 15:36:59 2020-Jun-23 15:37

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 15:56 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin