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4138 Kalchas (1973 SM)
Classification: Jupiter Trojan          SPK-ID: 2004138
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04442007274196343 2.7889e-08  
a 5.166750363466199 6.3164e-08 au
q 4.937242936481464 1.7849e-07 au
i 2.098963268384568 2.4811e-06 deg
node 208.0202369212653 1.8789e-05 deg
peri 164.8732459580677 3.1492e-05 deg
M 6.812454538492192 2.4976e-05 deg
tp 2459119.324352539168
(2020-Sep-26.82435254)
0.00029811 TDB
period 4289.677519428652
11.74
7.8662e-05
2.154e-07
d
yr
n .0839223923871902 1.5389e-09 deg/d
Q 5.396257790450933 6.5969e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2923  
   data-arc span      23655 days (64.76 yr)  
   first obs. used      1956-05-08  
   last obs. used      2021-02-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43322  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 15:59:34  

Additional Information
 Earth MOID = 3.93599 au 
 Jupiter MOID = .0218539 au 
 T_jup = 2.997 
[ 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 10.11   n/a E2021B10  
diameter diameter 46.462 km 0.669 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
rotation period rot_per 29.2 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[French, L.M.; Stephens, R.D.; Coley, D.R.; Megna, R.; Wasserman, L.H. (2012) Minor Planet Bull. 39, 183-187.]
[Ryan, E.L.; Sharkey, B.N.L.; Woodward, C.E. (2017) Astron. J. 153, A116.]
[Szabo, Gy.M.; Pal, A.; Kiss, Cs.; Kiss, L.L.; et al. (2017) Astron. Astrophys. 599, A44.]
geometric albedo albedo 0.082   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  

4138 Kalchas (1973 SM)          Discovered 1973-Sep-19 by van Houten and Gehrels at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1973 SM = 1986 VU6 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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