Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Near-Earth Object (NEO) Program
Search JPL
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 ]  
16539 (1991 PY12)
Classification: Main-belt Asteroid          SPK-ID: 2016539
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1780646858382447 5.7869e-08  
a 2.689096870331612 2.0151e-08 AU
q 2.210263680927406 1.574e-07 AU
i 12.29102559207537 1.0619e-05 deg
node 328.0107709410003 2.7709e-05 deg
peri 104.8065550327347 4.7957e-05 deg
M 22.1228912050336 3.244e-05 deg
tp 2456901.519992912066
(2014-Sep-01.01999291)
0.00014544 JED
period 1610.675667181725
4.41
1.8105e-05
4.957e-08
d
yr
n .2235086847930775 2.5123e-09 deg/d
Q 3.167930059735817 2.3739e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      887  
   data-arc span      10105 days (27.67 yr)  
   first obs. used      1987-09-25  
   last obs. used      2015-05-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50079  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jun-04 16:26:40  

Additional Information
 Earth MOID = 1.26203 AU 
 T_jup = 3.317 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.5 mag n/a MPO337399  
rotation period rot_per 4.8 h n/a LCDB (Rev. 2015-July); 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:
[Behrend, R. (2015) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]

16539 (1991 PY12)          Discovered 1991-Aug-05 by Holt, H. E. at Palomar
Reference: 20000913/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1991 PY12 = 1987 SP16 = 1993 BM2 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2015-Aug-04 23:56 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin