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 ]  
4116 Elachi (1982 SU)
Classification: Inner Main-belt Asteroid          SPK-ID: 2004116
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ 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 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08041474169436121 4.0947e-08  
a 1.872517921138199 4.7887e-09 au
q 1.721939876191808 7.7198e-08 au
i 24.11140073841688 5.8321e-06 deg
node 185.083973860971 8.535e-06 deg
peri 322.7865488352668 3.2232e-05 deg
M 113.8840954820051 3.0161e-05 deg
tp 2458704.427563856316
(2019-Aug-08.92756386)
7.8508e-05 TDB
period 935.9171406736784
2.56
3.5902e-06
9.829e-09
d
yr
n .3846494356763997 1.4755e-09 deg/d
Q 2.023095966084589 5.1738e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2120  
   data-arc span      15638 days (42.81 yr)  
   first obs. used      1977-10-11  
   last obs. used      2020-08-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40596  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 23:11:30  

Additional Information
 Earth MOID = .746493 au 
 Jupiter MOID = 2.96858 au 
 T_jup = 3.870 
[ 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 13.8   n/a MPO467676  
diameter diameter 4.693 km 0.065 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 38.143 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Warner, B.D. (2006) Minor Planet Bull. 33, 35-39.]
[Warner, B.D (2011) Minor Planet Bull. 38, 25-31.]
[Warner, B.D. (2012) Minor Planet Bull. 39, 245-252.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.245   0.030 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
SMASSII spectral type spec_B Sl   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

4116 Elachi (1982 SU)          Discovered 1982-Sep-20 by Helin, E. at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1982 SU = 1976 GA4 = 1989 EK1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Sep-21 17:25 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin