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
IMPORTANT: The SSD Announcement email list is now available. Major changes are coming in the near future, including possible hostname and/or URL changes. To be notified of such changes, subscribe to this email list.

Please visit this page for more details.


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 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1247038093158947 2.6417e-08  
a 2.267145659433204 6.7151e-09 au
q 1.984423959427887 5.9425e-08 au
i 4.034586231896732 3.0042e-06 deg
node 175.4623212113441 5.5142e-05 deg
peri 333.3065147024114 5.7398e-05 deg
M 188.8611204462425 1.6254e-05 deg
tp 2459593.239331157353
(2022-Jan-13.73933116)
5.6917e-05 TDB
period 1246.859625194746
3.41
5.5397e-06
1.517e-08
d
yr
n .288725364688725 1.2828e-09 deg/d
Q 2.549867359438521 7.5525e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2147  
   data-arc span      10519 days (28.80 yr)  
   first obs. used      1990-12-21  
   last obs. used      2019-10-09  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46955  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 20:03:59  

Additional Information
 Earth MOID = .99643 au 
 Jupiter MOID = 2.44755 au 
 T_jup = 3.602 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456858.5 (2014-Jul-20.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1242418483225322 2.6358e-08  
q 1.985560640451229 5.9298e-08 au
tp 2457098.388821614146
(2015-Mar-16.88882161)
5.5395e-05 TDB
node 175.5571376529053 5.5188e-05 deg
peri 333.1548847072381 5.7475e-05 deg
i 4.032287670924342 3.0038e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2147  
   data-arc span      10519 days (28.80 yr)  
   first obs. used      1990-12-21  
   last obs. used      2019-10-09  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46955  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 20:03:59  

Additional Information
 Jupiter MOID = 2.44755 au 
 T_jup = 3.602 
Orbit Covariance (6×6)
  e q tp node peri i
e 6.94734662096703E-16 -1.555487413737058E-15 -8.846661809331184E-14 -3.246830505432924E-15 -3.782951828899374E-14 -1.139423135799959E-16
q -1.555487413737058E-15 3.516223838665621E-15 2.242365510691188E-13 7.92167433684891E-15 8.982580891968342E-14 2.91339903255441E-16
tp -8.846661809331184E-14 2.242365510691188E-13 3.068653817553639E-9 7.977251980573639E-12 9.053950022849772E-10 -1.482075233143093E-12
node -3.246830505432924E-15 7.92167433684891E-15 7.977251980573639E-12 3.045769713109666E-9 -3.035499015888995E-9 3.208379551109995E-11
peri -3.782951828899374E-14 8.982580891968342E-14 9.053950022849772E-10 -3.035499015888995E-9 3.30338538921867E-9 -3.245457135078276E-11
i -1.139423135799959E-16 2.91339903255441E-16 -1.482075233143093E-12 3.208379551109995E-11 -3.245457135078276E-11 9.02290335742467E-12

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

[ 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 2020-Jun-01 05:43 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin