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 ]  
4631 Yabu (1987 WE1)
Classification: Main-belt Asteroid          SPK-ID: 2004631
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .123332718918959 1.6873e-08  
a 2.234021868177258 5.6196e-09 au
q 1.958493877050544 3.8821e-08 au
i 7.410186624994463 7.2431e-07 deg
node 25.68364264577106 3.9575e-06 deg
peri 51.57913128901985 5.6656e-06 deg
M 299.6140902720731 4.7075e-06 deg
tp 2459405.079762223939
(2021-Jul-09.57976222)
1.652e-05 TDB
period 1219.634095643301
3.34
4.6019e-06
1.26e-08
d
yr
n .2951704952214513 1.1137e-09 deg/d
Q 2.509549859303971 6.3127e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2534  
   data-arc span      24069 days (65.90 yr)  
   first obs. used      1955-03-22  
   last obs. used      2021-02-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4051  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 16:34:47  

Additional Information
 Earth MOID = .982204 au 
 Jupiter MOID = 2.72785 au 
 T_jup = 3.619 
[ 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 13.38   n/a E2021B10  
diameter diameter 5.454 km 0.174 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 7.356 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Warner, B.D. (2005) Minor Planet Bull. 32, 54-58.]
[Behrend, R. (2007) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.311   0.043 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

4631 Yabu (1987 WE1)          Discovered 1987-Nov-22 by Ueda and Kaneda at Kushiro
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1987 WE1 = 1957 WG = 1977 TO7 = 1977 VJ2 = A899 NA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Jun-14 09:53 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin