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16969 Helamuda (1998 UM20)
Classification: Outer Main-belt Asteroid          SPK-ID: 2016969
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1545418914695174 4.3806e-08  
a 3.24682735251787 2.6359e-08 au
q 2.745056512184793 1.3601e-07 au
i 2.597491320561117 4.7357e-06 deg
node 91.11471870167597 0.00010958 deg
peri 342.5865364407925 0.00011082 deg
M 259.4671248539271 1.9724e-05 deg
tp 2459797.250543488301
(2022-Aug-05.75054349)
0.00012053 TDB
period 2136.914868331809
5.85
2.6022e-05
7.124e-08
d
yr
n .168467169813384 2.0515e-09 deg/d
Q 3.748598192850947 3.0432e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1025  
   data-arc span      15887 days (43.50 yr)  
   first obs. used      1977-02-18  
   last obs. used      2020-08-18  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .57132  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 01:49:25  

Additional Information
 Earth MOID = 1.75967 au 
 Jupiter MOID = 1.52663 au 
 T_jup = 3.162 
[ 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 13.86   n/a E2021B10  

16969 Helamuda           Discovered 1998 Oct. 29 at the Starkenburg Observatory, Heppenheim.
Helamuda is an acronym for Hessisches Landesmuseum Darmstadt, the museum of the federal state of Hessen. This unique institution features exquisite collections in both fine arts and natural sciences and conducts paleontological excavations at the nearby Messel site.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20010309/MPCPages.arcLast Updated: 2009-05-11

[ show close-approach data ]
Alternate Designations
 1998 UM20 = 1977 DA2 = 1998 SK147 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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