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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1247038112628397 2.6217e-08  
a 2.267145659947801 6.6648e-09 au
q 1.984423955464304 5.9053e-08 au
i 4.034586337398964 2.9986e-06 deg
node 175.4623321714621 5.3926e-05 deg
peri 333.3065016861447 5.6144e-05 deg
M 188.8611220548754 1.6079e-05 deg
tp 2459593.239325787664
(2022-Jan-13.73932579)
5.6365e-05 TDB
period 1246.859625619265
3.41
5.4981e-06
1.505e-08
d
yr
n .2887253645904225 1.2732e-09 deg/d
Q 2.549867364431297 7.4959e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2194  
   data-arc span      10818 days (29.62 yr)  
   first obs. used      1990-12-21  
   last obs. used      2020-08-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46875  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-25 00:25:12  

Additional Information
 Earth MOID = .99643 au 
 Jupiter MOID = 2.44755 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 13.7   n/a MPO337356  
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. 2019-August); 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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