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21554 Leechaohsi (1998 QR69)
Classification: Main-belt Asteroid          SPK-ID: 2021554
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 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2143403085559913 3.4194e-08  
a 3.126892800306532 1.9655e-08 au
q 2.456673632667322 1.046e-07 au
i 15.56501285585458 3.979e-06 deg
node 228.7137726158325 1.6105e-05 deg
peri 19.01153422069166 1.9827e-05 deg
M 74.44119870713484 1.0636e-05 deg
tp 2458782.882419691463
(2019-Oct-26.38241969)
6.0108e-05 TDB
period 2019.611875173412
5.53
1.9043e-05
5.214e-08
d
yr
n .1782520713139939 1.6807e-09 deg/d
Q 3.797111967945742 2.3868e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1807  
   data-arc span      8664 days (23.72 yr)  
   first obs. used      1997-05-01  
   last obs. used      2021-01-19  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45537  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:47:59  

Additional Information
 Earth MOID = 1.44755 au 
 Jupiter MOID = 1.24202 au 
 T_jup = 3.123 
[ 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 13.28   n/a E2021B10  
diameter diameter 15.196 km 0.551 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 6.321 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.]
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.040   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

21554 Leechaohsi           Discovered 1998 Aug. 24 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Lee Chao-Hsi (b. 1987) was awarded first place in the 2006 Intel International Science and Engineering Fair for his engineering team project. He attends the Taipei Municipal LiShan High School, Taipei, Taiwan, Chinese Taipei.
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
1905-Sep-03 07:16 00:03 Jupiter 1.23766516100474 1.23766453455534 1.23766578753342 3.91115101744381 3.73207176884787 2417091.802608673 2.68617562178276 653.268550968989 19.9849850426761 87.9272123346034 3725153.52328866 T 32 CATAB v2.0f-lin.ifort 2021-Apr-13 03:48:05 2021-Apr-13 03:48
1916-Feb-13 18:48 00:04 Jupiter 1.86413971515895 1.86413584950246 1.86414358082011 3.2634450024385 3.12110861110565 2420907.283397110 4.05949516871013 258.012967154121 106.997228411126 36.4247070614626 2546639.21014807 T 32 CATAB v2.0f-lin.ifort 2021-Apr-13 03:48:05 2021-Apr-13 03:48
1989-Jan-28 22:18 < 00:01 Jupiter 1.32843177194895 1.32843090483255 1.32843263906678 3.8886493382216 3.72107134786157 2447555.429221409 0.824861080345076 118.224291690404 33.9408711371368 76.5591407762942 3420407.57687614 T 32 CATAB v2.0f-lin.ifort 2021-Apr-13 03:48:05 2021-Apr-13 03:48
1999-Sep-18 22:08 < 00:01 Jupiter 1.55785750636247 1.5578567426631 1.55785827006256 3.77815455664088 3.63139533822504 2451440.422160675 0.564872508244683 151.597878238076 36.7635681130251 -84.402891423081 3291533.4204022 T 32 CATAB v2.0f-lin.ifort 2021-Apr-13 03:48:05 2021-Apr-13 03:48
2072-Jul-29 01:39 00:02 Jupiter 1.58594429067698 1.58594236216725 1.5859462191904 3.72197388072037 3.57560174278005 2478052.568707054 1.59733832297482 167.93798673362 47.6796502119069 57.4638121484033 3310410.30193303 T 32 CATAB v2.0f-lin.ifort 2021-Apr-13 03:48:05 2021-Apr-13 03:48
2083-Mar-20 15:15 00:02 Jupiter 1.32096995276471 1.32096840356586 1.32097150203144 3.89566395359416 3.72743511552879 2481939.135456705 1.72259535994047 503.181914460555 17.3031252558111 -81.3888560694917 3466479.35657113 T 32 CATAB v2.0f-lin.ifort 2021-Apr-13 03:48:05 2021-Apr-13 03:48
2156-Feb-25 23:42 00:05 Jupiter 1.89250106206102 1.89249580602479 1.89250631811112 3.1140213485442 2.96681536101661 2508578.487587134 5.29202734353353 383.582627528087 91.950041439973 -37.6657446179775 2952078.27860266 T 32 CATAB v2.0f-lin.ifort 2021-Apr-13 03:48:05 2021-Apr-13 03:48
2166-Aug-15 19:54 00:04 Jupiter 1.25066750610842 1.250666975689 1.25066803664969 3.88909555167266 3.71086937369586 2512402.329460658 3.49923322700113 828.83316655668 17.1171668487736 -88.6512862411765 3680465.14323057 T 32 CATAB v2.0f-lin.ifort 2021-Apr-13 03:48:05 2021-Apr-13 03:48
2177-Jan-16 23:13 00:06 Jupiter 1.92911283084545 1.92910639384128 1.9291192678507 3.54711869045619 3.4210968721534 2516209.467103770 6.24722148273299 330.629540354234 81.6241738807821 4.60060946070305 1344639.70501865 T 32 CATAB v2.0f-lin.ifort 2021-Apr-13 03:48:05 2021-Apr-13 03:48

Alternate Designations
 1998 QR69 = 1997 JF14 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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