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21723 Yinyinwu (1999 RT128)
Classification: Main-belt Asteroid          SPK-ID: 2021723
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2782683678965619 3.7437e-08  
a 2.759064227308744 1.3834e-08 au
q 1.991303927853751 1.0453e-07 au
i 6.962927984972539 4.644e-06 deg
node 182.9101767036917 3.0179e-05 deg
peri 153.4044819352426 3.1126e-05 deg
M 230.1677877336882 1.0865e-05 deg
tp 2459804.199893130038
(2022-Aug-12.69989313)
5.3342e-05 TDB
period 1673.944837980751
4.58
1.259e-05
3.447e-08
d
yr
n .2150608501736899 1.6175e-09 deg/d
Q 3.526824526763737 1.7684e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1311  
   data-arc span      14394 days (39.41 yr)  
   first obs. used      1981-10-25  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .55155  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 03:15:53  

Additional Information
 Earth MOID = .98325 au 
 Jupiter MOID = 1.90441 au 
 T_jup = 3.274 
[ 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 14.22   n/a MPCxxxxx  
diameter diameter 8.159 km 0.071 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 297.889 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.073   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21723 Yinyinwu           Discovered 1999 Sept. 9 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Yin Yin Wu (b. 1989) was awarded second place in the 2006 Intel International Science and Engineering Fair for her chemistry project. She attends the J.M. Atherton High School, Louisville, Kentucky, 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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1955-Nov-09 09:56 00:01 Jupiter 1.90166571133553 1.90166530649045 1.90166611618028 1.26065040992963 0.835713938717764 2435420.914222542 1.28907785951234 350.369562923772 144.331980770327 -8.59135282129734 1535705.58643544 T 31 CATAB v2.0g-lin.ifort 2021-May-04 03:15:58 2021-May-04 03:15
2015-Sep-09 00:07 < 00:01 Jupiter 1.89142465413176 1.89142431464823 1.89142499361551 1.49952040819906 1.16314937174788 2457274.504867248 0.154926391342189 145.209279320042 97.9982628602626 -2.26296298843091 1530071.75746306 T 31 CATAB v2.0g-lin.ifort 2021-May-04 03:15:58 2021-May-04 03:15
2075-Jul-07 03:55 00:01 Jupiter 1.94383165065425 1.94383114091084 1.94383216040009 1.80382771869058 1.54346902493232 2479125.663502476 1.31063433021646 154.629861103459 61.4164950417353 83.7433786396667 1789967.72508899 T 31 CATAB v2.0g-lin.ifort 2021-May-04 03:15:58 2021-May-04 03:15
2097-Sep-25 20:15 00:02 Jupiter 1.98430880872287 1.98430802868057 1.98430958876404 1.40328249685693 1.05616348609678 2487242.343704516 1.9015471315026 150.541915500713 116.444245832156 7.22784581807857 1448846.45018526 T 31 CATAB v2.0g-lin.ifort 2021-May-04 03:15:58 2021-May-04 03:15
2157-Aug-02 12:41 00:03 Jupiter 1.90704600746564 1.90704530919569 1.90704670573623 1.38865697203446 1.01983320587969 2509102.028299727 3.13413431976869 237.094611147591 136.535584422716 5.62371032014944 1482576.48891483 T 31 CATAB v2.0g-lin.ifort 2021-May-04 03:15:58 2021-May-04 03:15

Alternate Designations
 1999 RT128 = 1981 UQ26 = 1998 HT137 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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