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21045 (1990 SQ1)
Classification: Main-belt Asteroid          SPK-ID: 2021045
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1959396241839695 5.2647e-08  
a 2.67091736822167 1.2212e-08 au
q 2.147578822865879 1.4397e-07 au
i 11.75096774698826 5.7926e-06 deg
node 344.2617840448721 1.7434e-05 deg
peri 8.543849538650264 2.0205e-05 deg
M 341.0848342737159 1.0531e-05 deg
tp 2459284.271589350686
(2021-Mar-10.77158935)
4.6956e-05 TDB
period 1594.369967604366
4.37
1.0934e-05
2.994e-08
d
yr
n .2257945190355793 1.5485e-09 deg/d
Q 3.194255913577461 1.4604e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1351  
   data-arc span      11013 days (30.15 yr)  
   first obs. used      1990-08-27  
   last obs. used      2020-10-21  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5173  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:37:17  

Additional Information
 Earth MOID = 1.14087 au 
 Jupiter MOID = 2.24313 au 
 T_jup = 3.324 
[ 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 13.97   n/a E2021B10  
diameter diameter 8.151 km 0.189 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 10.06609 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 sidereal period (not synodic); Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Durech, J.; Hanus, J.; Ali-Lagoa, V. (2018) Astron. Astrophys. 617, A57.]
geometric albedo albedo 0.043   0.025 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2017AJ....154..168M)  

21045 (1990 SQ1)          Discovered 1990-Sep-18 by Holt, H. E. at Palomar
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1990 SQ1 = 1990 QC18 = 1990 RE17 = 1999 XN114 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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