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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2278548131416314 4.6237e-08  
a 2.571226880662414 1.0286e-08 au
q 1.98536046022434 1.2327e-07 au
i 7.783236898146092 4.1944e-06 deg
node 157.1572774356362 1.8263e-05 deg
peri 182.562260662262 2.0085e-05 deg
M 65.72488284524671 5.4861e-06 deg
tp 2459121.561001504932
(2020-Sep-29.06100150)
2.3427e-05 TDB
period 1505.944707292584
4.12
9.0364e-06
2.474e-08
d
yr
n .2390526015043506 1.4344e-09 deg/d
Q 3.157093301100488 1.2629e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1902  
   data-arc span      12218 days (33.45 yr)  
   first obs. used      1987-08-29  
   last obs. used      2021-02-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51402  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 14:56:18  

Additional Information
 Earth MOID = .975878 au 
 Jupiter MOID = 2.24832 au 
 T_jup = 3.380 
[ 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 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

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