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 ]  
46339 (2001 RU81)
Classification: Main-belt Asteroid          SPK-ID: 2046339
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 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08989295216165094 5.2331e-08  
a 2.737283527825003 1.3098e-08 au
q 2.491221030605355 1.4213e-07 au
i 3.922923332730227 6.067e-06 deg
node 3.665906534198564 5.5124e-05 deg
peri 347.3149607263523 5.9703e-05 deg
M 359.0482102300348 2.2816e-05 deg
tp 2458604.873374160473
(2019-May-01.37337416)
0.00010484 TDB
period 1654.16223986906
4.53
1.1872e-05
3.25e-08
d
yr
n .2176328242316164 1.562e-09 deg/d
Q 2.983346025044652 1.4275e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1220  
   data-arc span      8478 days (23.21 yr)  
   first obs. used      1996-09-11  
   last obs. used      2019-11-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55692  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-04 03:16:09  

Additional Information
 Earth MOID = 1.48461 au 
 Jupiter MOID = 2.39418 au 
 T_jup = 3.342 
[ 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 MPO319638  
diameter diameter 4.035 km 0.462 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 4.180 h n/a LCDB (Rev. 2019-January); 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.227   0.045 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

46339 (2001 RU81)          Discovered 2001-Sep-14 by JPL/GEODSS NEAT at Palomar
Reference: 20020822/Numbers.arcLast Updated: 2004-04-19

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
2022-Jul-28 09:00 00:01 Hygie 0.0337967496096285 0.0337959213090323 0.0337975779120874 2.62898093737454 2.62898050252393 2459788.874918819 1.45985656155894 145.812590682959 40.975295110937 88.4689005994567 122840.341734134 T 25 CATAB v2.0f-lin.ifort 2019-Dec-04 03:16:24 2019-Dec-04 03:16

Alternate Designations
 2001 RU81 = 1996 TH53 
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-13 11:07 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin