Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
11512 (1991 AB2)
Classification: Main-belt Asteroid          SPK-ID: 2011512
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1247038092158852 2.4498e-08  
a 2.267145659512441 6.2756e-09 au
q 1.984423959723979 5.5843e-08 au
i 4.034586493408249 2.9863e-06 deg
node 175.462376400777 4.2932e-05 deg
peri 333.3064593382956 4.5087e-05 deg
M 188.8611207157807 1.4942e-05 deg
tp 2459593.239330254882
(2022-Jan-13.73933025)
5.2814e-05 TDB
period 1246.859625260113
3.41
5.177e-06
1.417e-08
d
yr
n .2887253646735884 1.1988e-09 deg/d
Q 2.549867359300903 7.0581e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2499  
   data-arc span      10920 days (29.90 yr)  
   first obs. used      1990-12-21  
   last obs. used      2020-11-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44676  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:46:12  

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. 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

[ show close-approach data ]
Alternate Designations
 1991 AB2 = 1969 UO1 = 1996 TG51 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Jan-15 19:05 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin