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21002 (1987 QU7)
Classification: Main-belt Asteroid          SPK-ID: 2021002
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 .2278934785571784 4.635e-08  
a 2.571112091323804 1.0401e-08 au
q 1.985172413071601 1.2367e-07 au
i 7.783261348696458 4.1993e-06 deg
node 157.158307027776 1.8267e-05 deg
peri 182.5364446636614 2.0091e-05 deg
M 18.8847663294463 5.5645e-06 deg
tp 2459121.506918171436
(2020-Sep-29.00691817)
2.3426e-05 TDB
period 1505.843861776656
4.12
9.1374e-06
2.502e-08
d
yr
n .2390686107225335 1.4507e-09 deg/d
Q 3.157051769576008 1.2771e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1883  
   data-arc span      12191 days (33.38 yr)  
   first obs. used      1987-08-29  
   last obs. used      2021-01-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51528  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:50:29  

Additional Information
 Earth MOID = .974625 au 
 Jupiter MOID = 2.24831 au 
 T_jup = 3.380 
[ 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 14.65   n/a E2021B10  
diameter diameter 3.579 km 1.018 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2017AJ....154..168M)  
rotation period rot_per 121.586 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 0.182   0.141 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2017AJ....154..168M)  

21002 (1987 QU7)          Discovered 1987-Aug-29 by Elst, E. W. at La Silla
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1987 QU7 = 1991 NO9 = 1998 FH26 = 1999 LF11 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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