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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1232807018097916 2.8329e-08  
a 2.234947038609494 6.0408e-09 au
q 1.959421199182001 6.4952e-08 au
i 7.408792506671801 3.7223e-06 deg
node 25.70211419527535 2.2571e-05 deg
peri 51.36555692681888 2.7552e-05 deg
M 240.7956873221952 1.6605e-05 deg
tp 2459404.599904949831
(2021-Jul-09.09990495)
5.7059e-05 TDB
period 1220.391800547884
3.34
4.9479e-06
1.355e-08
d
yr
n .2949872326562512 1.196e-09 deg/d
Q 2.510472878036988 6.7856e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2289  
   data-arc span      23965 days (65.61 yr)  
   first obs. used      1955-03-22  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41183  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:50:02  

Additional Information
 Earth MOID = .983534 au 
 Jupiter MOID = 2.72803 au 
 T_jup = 3.618 
[ 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 13.3   n/a MPO435742  
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. 2019-August); 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

[ 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
1900-Sep-25 06:41 < 00:01 Juno 0.0346176836432392 0.0346148698824202 0.0346205002816011 7.46092396303506 7.46092391593132 2415287.778294216 0.309235259130453 531.058447700428 33.2959164639963 75.0943847301347 150278.302357807 T 26 CATAB v2.0f-lin.ifort 2020-Nov-13 03:50:08 2020-Nov-13 03:50

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 2020-Nov-25 08:24 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin