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20477 Anastroda (1999 NQ18)
Classification: Main-belt Asteroid          SPK-ID: 2020477
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 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1263569595627935 3.5449e-08  
a 2.383667597549294 8.6868e-09 au
q 2.082474607314617 8.4395e-08 au
i 5.937534023105096 4.064e-06 deg
node 317.2730682337194 3.2423e-05 deg
peri 349.6847979877778 3.6067e-05 deg
M 283.2186615564027 1.7932e-05 deg
tp 2459487.195016537290
(2021-Sep-29.69501654)
6.7739e-05 TDB
period 1344.209518166208
3.68
7.3481e-06
2.012e-08
d
yr
n .2678153927158005 1.464e-09 deg/d
Q 2.684860587783972 9.7845e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1537  
   data-arc span      9589 days (26.25 yr)  
   first obs. used      1994-01-19  
   last obs. used      2020-04-21  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51624  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:22:00  

Additional Information
 Earth MOID = 1.066 au 
 Jupiter MOID = 2.54325 au 
 T_jup = 3.519 
[ 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 14.78   n/a E2021B10  
diameter diameter 2.747 km 0.446 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.407   0.120 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20477 Anastroda           Discovered 1999 July 14 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Anastasia Nast Roda (b. 1989) is a finalist in the 2004 Discovery Channel Young Scientist Challenge (DCYSC), a middle school science competition, for her earth and space science project. She attends the St. Leo the Great School, Lancaster, Pennsylvania.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20041028/MPCPages.arcLast Updated: 2004-10-29

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Alternate Designations
 1999 NQ18 = 1998 CQ4 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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