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21655 Niklauswirth (1999 PC1)
Classification: Main-belt Asteroid          SPK-ID: 2021655
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1804253429702663 1.8158e-08  
a 2.642487965756149 1.0636e-08 au
q 2.165716168239795 4.5536e-08 au
i 13.42983165499005 9.1007e-07 deg
node 293.3186083874128 3.5126e-06 deg
peri 7.333495706412605 8.8488e-06 deg
M 112.9715135678476 6.7692e-06 deg
tp 2458904.138143347135
(2020-Feb-24.63814335)
2.8707e-05 TDB
period 1568.981974279558
4.30
9.4723e-06
2.593e-08
d
yr
n .229448142745747 1.3852e-09 deg/d
Q 3.119259763272504 1.2555e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2271  
   data-arc span      10675 days (29.23 yr)  
   first obs. used      1991-12-28  
   last obs. used      2021-03-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .40377  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 18:36:00  

Additional Information
 Earth MOID = 1.15017 au 
 Jupiter MOID = 2.11171 au 
 T_jup = 3.333 
[ 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 13.34   n/a MPCxxxxx  
diameter diameter 6.609 km 0.105 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 18.8016 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:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.194   0.017 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21655 Niklauswirth           Discovered 1999 Aug. 8 by L. Šarounová at Ondřejov.
Niklaus Wirth (b. 1934), professor of computer science variously at Stanford University, the University of Zurich and the Swiss Federal Institute of Technology, Zurich, created the computer languages ALGOL, Pascal and Modula. His ideas are widely used in the architecture of contemporary computer systems.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20010902/MPCPages.arcLast Updated: 2009-05-11

Alternate Designations
 1999 PC1 = 1998 MC27 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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