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18544 (1997 AA2)
Classification: Main-belt Asteroid          SPK-ID: 2018544
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 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1411510956847382 1.9953e-08  
a 2.686276458222823 9.7431e-09 au
q 2.307105592832554 5.3602e-08 au
i 2.815039649754278 8.7724e-07 deg
node 28.42928275757408 9.8222e-06 deg
peri 133.3626143314364 1.2855e-05 deg
M 125.9652659917927 5.2252e-06 deg
tp 2458637.805340555351
(2019-Jun-03.30534056)
2.1598e-05 TDB
period 1608.142338327394
4.40
8.7491e-06
2.395e-08
d
yr
n .2238607811137109 1.2179e-09 deg/d
Q 3.065447323613093 1.1118e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2216  
   data-arc span      13314 days (36.45 yr)  
   first obs. used      1984-02-26  
   last obs. used      2020-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46145  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:31:25  

Additional Information
 Earth MOID = 1.31606 au 
 Jupiter MOID = 1.91111 au 
 T_jup = 3.358 
[ 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 13.53   n/a E2021B10  
diameter diameter 6.700 km 0.088 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
geometric albedo albedo 0.188   0.029 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

18544 (1997 AA2)          Discovered 1997-Jan-03 by Kobayashi, T. at Oizumi
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1997 AA2 = 1984 DD2 = 1988 BB1 = 1993 EC 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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