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91021 (1998 DQ28)
Classification: Main-belt Asteroid          SPK-ID: 2091021
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1728870124543113 3.9662e-08  
a 2.64812786661668 1.4613e-08 au
q 2.190300951160313 1.1008e-07 au
i 10.60615064605953 5.0086e-06 deg
node 9.366418006221721 2.0413e-05 deg
peri 301.2727780330559 2.5168e-05 deg
M 295.4107742958529 1.5795e-05 deg
tp 2459282.899830402908
(2021-Mar-09.39983040)
6.9538e-05 TDB
period 1574.007705413927
4.31
1.3029e-05
3.567e-08
d
yr
n .2287155258273202 1.8932e-09 deg/d
Q 3.105954782073047 1.7139e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1154  
   data-arc span      8197 days (22.44 yr)  
   first obs. used      1998-02-26  
   last obs. used      2020-08-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52569  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-25 08:15:00  

Additional Information
 Earth MOID = 1.1987 au 
 Jupiter MOID = 2.27412 au 
 T_jup = 3.346 
[ 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 14.3   n/a MPO436408  
diameter diameter 3.844 km 0.271 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.274   0.021 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

91021 (1998 DQ28)          Discovered 1998-Feb-26 by Spacewatch at Kitt Peak
Reference: 20041028/Numbers.arcLast Updated: 2004-10-29

[ show close-approach data ]
Alternate Designations
 1998 DQ28 = 2000 XA23 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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