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11512 (1991 AB2)
Classification: Main-belt Asteroid          SPK-ID: 2011512
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 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1249059915406851 1.4646e-08  
a 2.266830465547742 5.9837e-09 au
q 1.983689758593869 3.3688e-08 au
i 4.035005384174606 7.3971e-07 deg
node 175.4621398858975 1.6438e-05 deg
peri 333.2978444127639 1.6954e-05 deg
M 246.6365583193825 5.8437e-06 deg
tp 2459593.052285105805
(2022-Jan-13.55228511)
2.127e-05 TDB
period 1246.599613976363
3.41
4.936e-06
1.351e-08
d
yr
n .2887855859763053 1.1435e-09 deg/d
Q 2.549971172501616 6.7312e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2681  
   data-arc span      11033 days (30.21 yr)  
   first obs. used      1990-12-21  
   last obs. used      2021-03-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44441  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 22:48:44  

Additional Information
 Earth MOID = .995533 au 
 Jupiter MOID = 2.44664 au 
 T_jup = 3.602 
[ 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 13.80   n/a E2021B10  
diameter diameter 4.347 km 0.072 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 2.933 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:
[Hess, K.; Ditteon, R. (2016) Minor Planet Bull. 43, 87.]
geometric albedo albedo 0.372   0.056 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

11512 (1991 AB2)          Discovered 1991-Jan-11 by Helin, E. F. at Palomar
Reference: 19990928/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1991 AB2 = 1969 UO1 = 1996 TG51 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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