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18872 Tammann (1999 VR20)
Classification: Main-belt Asteroid          SPK-ID: 2018872
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 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07122616455818491 1.9849e-08  
a 2.595918088612916 9.6288e-09 au
q 2.411020799653804 5.2501e-08 au
i 14.24400226829623 9.0073e-07 deg
node 222.9308388254474 3.22e-06 deg
peri 16.03149841427504 1.1798e-05 deg
M 193.2381673223792 1.1719e-05 deg
tp 2459908.167192853161
(2022-Nov-24.66719285)
5.186e-05 TDB
period 1527.688832249961
4.18
8.4998e-06
2.327e-08
d
yr
n .23565008292284 1.3111e-09 deg/d
Q 2.780815377572029 1.0315e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2424  
   data-arc span      24532 days (67.16 yr)  
   first obs. used      1954-01-03  
   last obs. used      2021-03-04  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44008  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:40:31  

Additional Information
 Earth MOID = 1.40129 au 
 Jupiter MOID = 2.21223 au 
 T_jup = 3.370 
[ 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 13.43   n/a MPCxxxxx  
diameter diameter 5.482 km 0.072 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.162   0.017 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18872 Tammann           Discovered 1999 Nov. 8 by S. Sposetti at Gnosca.
Swiss cosmologist Gustav Tammann (b. 1932), a professor of astronomy at the University of Basle, is a world-renowned specialist in the determination of the Hubble constant.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20010705/MPCPages.arcLast Updated: 2009-05-11

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Alternate Designations
 1999 VR20 = 1978 XQ1 = 1998 OL 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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