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 ]  
27161 (1999 AR4)
Classification: Main-belt Asteroid          SPK-ID: 2027161
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .199193735796449 3.1428e-08  
a 2.712984029650087 1.2861e-08 au
q 2.172574605627982 8.4496e-08 au
i 9.322500928002777 3.871e-06 deg
node 109.40318416839 2.5714e-05 deg
peri 330.92827752017 2.8058e-05 deg
M 225.9269863958194 1.2473e-05 deg
tp 2459208.366420911300
(2020-Dec-24.86642091)
5.8906e-05 TDB
period 1632.184625715345
4.47
1.1606e-05
3.178e-08
d
yr
n .2205632833002707 1.5683e-09 deg/d
Q 3.253393453672193 1.5422e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1169  
   data-arc span      10831 days (29.65 yr)  
   first obs. used      1989-12-30  
   last obs. used      2019-08-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56359  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-24 01:43:53  

Additional Information
 Earth MOID = 1.19363 au 
 Jupiter MOID = 2.00093 au 
 T_jup = 3.314 
[ 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 14.3   n/a MPO452550  

27161 (1999 AR4)          Discovered 1999-Jan-11 by Kobayashi, T. at Oizumi
Reference: 20010804/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 AR4 = 1989 YS2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2019-Dec-09 21:23 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin