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21557 Daniellitt (1998 QE73)
Classification: Main-belt Asteroid          SPK-ID: 2021557
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05953982236216913 2.7399e-08  
a 3.004875430667481 1.5038e-08 au
q 2.825965681305093 8.0519e-08 au
i 8.744963993595066 9.242e-07 deg
node 294.2857206502113 5.6704e-06 deg
peri 4.863452527155524 2.1113e-05 deg
M 141.427459335162 2.3613e-05 deg
tp 2458453.071980229486
(2018-Nov-30.57198023)
0.00012257 TDB
period 1902.559010691973
5.21
1.4282e-05
3.91e-08
d
yr
n .1892188352512996 1.4204e-09 deg/d
Q 3.183785180029869 1.5933e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2513  
   data-arc span      21329 days (58.40 yr)  
   first obs. used      1962-10-31  
   last obs. used      2021-03-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .41153  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 03:13:26  

Additional Information
 Earth MOID = 1.80829 au 
 Jupiter MOID = 1.99385 au 
 T_jup = 3.231 
[ 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 12.28   n/a E2021B10  
diameter diameter 12.179 km 0.173 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 4.233 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.]
[Durech, J.; Hanus, J.; Ali-Lagoa, V. (2018) Astron. Astrophys. 617, A57.]
geometric albedo albedo 0.172   0.015 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21557 Daniellitt           Discovered 1998 Aug. 24 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Daniel Abraham Litt (b. 1988) was awarded second place in the 2006 Intel International Science and Engineering Fair for his mathematics project. He attends the Orange High School, Pepper Pike, Ohio, 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

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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
1989-Oct-24 16:36 < 00:01 Jupiter 1.99332485005298 1.99332466466287 1.9933250354431 3.92073224865107 3.81081125043247 2447824.191837947 0.552414856398873 32.1304053710919 7.490749583927 86.1904134490334 9143733.82886244 T 42 CATAB v2.0g-lin.ifort 2021-May-04 03:14:15 2021-May-04 03:14
2119-Oct-22 00:17 00:02 Jupiter 1.99453189384072 1.99453167584535 1.99453211183813 3.79464945840776 3.68103515979795 2495302.511603919 2.3337734920329 126.955298766575 5.13576113179224 -84.9229608859608 11076424.2655239 T 42 CATAB v2.0g-lin.ifort 2021-May-04 03:14:15 2021-May-04 03:14

Alternate Designations
 1998 QE73 = 1962 UD = 1993 SG16 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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