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21680 Richardschwartz (1999 RS31)
Classification: Main-belt Asteroid          SPK-ID: 2021680
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 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05911102049644986 3.8974e-08  
a 2.759176000356412 1.2954e-08 au
q 2.596078291246032 1.0621e-07 au
i 5.298676391136989 4.7335e-06 deg
node 186.337105185042 4.1232e-05 deg
peri 227.633647073642 5.4728e-05 deg
M 177.749227228445 3.624e-05 deg
tp 2458373.943104821929
(2018-Sep-12.44310482)
0.00016793 TDB
period 1674.046559323029
4.58
1.1789e-05
3.228e-08
d
yr
n .2150477822705129 1.5145e-09 deg/d
Q 2.922273709466793 1.372e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1290  
   data-arc span      14122 days (38.66 yr)  
   first obs. used      1981-10-25  
   last obs. used      2020-06-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50475  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:55:33  

Additional Information
 Earth MOID = 1.60914 au 
 Jupiter MOID = 2.29494 au 
 T_jup = 3.333 
[ 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 14.53   n/a E2021B10  
diameter diameter 6.534 km 0.145 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 23.1768 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 0.079   0.016 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21680 Richardschwartz           Discovered 1999 Sept. 9 at Farra d´Isonzo.
Richard K. Schwartz (1933-1998) was an amateur astronomer in the \gamma -ray burster field at the Santa Barbara Astronomical Group. He co-founded a small CCD brand that in 1991 developed star tracking equipment, sparking the CCD revolution in the world of amateur astronomy.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20020921/MPCPages.arcLast Updated: 2003-10-02

[ show close-approach data ]
Alternate Designations
 1999 RS31 = 1981 UB26 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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