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21627 Sillis (1999 NZ3)
Classification: Main-belt Asteroid          SPK-ID: 2021627
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 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1997142089333508 5.1833e-08  
a 2.550032646462677 9.6444e-09 au
q 2.040754893720165 1.3073e-07 au
i 12.3512299713246 2.7366e-06 deg
node 146.6137761927563 2.0137e-05 deg
peri 84.65779654819211 2.1314e-05 deg
M 147.4125832113246 6.641e-06 deg
tp 2458591.455404823354
(2019-Apr-17.95540482)
2.7132e-05 TDB
period 1487.363218845953
4.07
8.438e-06
2.31e-08
d
yr
n .2420390631142031 1.3731e-09 deg/d
Q 3.05931039920519 1.1571e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1461  
   data-arc span      10782 days (29.52 yr)  
   first obs. used      1991-08-06  
   last obs. used      2021-02-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4891  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:50:48  

Additional Information
 Earth MOID = 1.07415 au 
 Jupiter MOID = 2.06106 au 
 T_jup = 3.381 
[ 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 14.43   n/a E2021B10  
diameter diameter 7.628 km 0.091 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 46.8 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Pravec, P.; Wolf, M.; Sarounova, L. (2019) http://www.asu.cas.cz/~ppravec/neo.htm]
geometric albedo albedo 0.055   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21627 Sillis           Discovered 1999 July 13 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Arnaud Georges Sillis (b. 1988) was awarded second place in the 2006 Intel International Science and Engineering Fair for his microbiology team project. He attends the Oregon Episcopal School, Portland, Oregon, U.S.A.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20060711/MPCPages.arcLast Updated: 2006-07-17

Alternate Designations
 1999 NZ3 = 1991 PA16 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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