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 ]  
4157 Izu (1988 XD2)
Classification: Main-belt Asteroid          SPK-ID: 2004157
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 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1599803203674422 3.5052e-08  
a 2.675243735898956 1.1679e-08 au
q 2.247257385968849 9.3137e-08 au
i 12.79792949288206 4.4767e-06 deg
node 66.9386778977368 1.5495e-05 deg
peri 206.3527911988064 2.0588e-05 deg
M 213.5765982305999 1.4749e-05 deg
tp 2459650.557019354739
(2022-Mar-12.05701935)
6.6537e-05 TDB
period 1598.245390694182
4.38
1.0466e-05
2.865e-08
d
yr
n .2252470128154961 1.475e-09 deg/d
Q 3.103230085829064 1.3547e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2515  
   data-arc span      31336 days (85.79 yr)  
   first obs. used      1934-04-19  
   last obs. used      2020-02-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4357  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 17:05:57  

Additional Information
 Earth MOID = 1.23848 au 
 Jupiter MOID = 2.00616 au 
 T_jup = 3.325 
[ 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 12.4   n/a MPO452223  
diameter diameter 21.01 km 1.1 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 5
geometric albedo albedo 0.0695   0.008 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 5
SMASSII spectral type spec_B Ch   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

4157 Izu (1988 XD2)          Discovered 1988-Dec-11 by Oshima, Y. at Gekko
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1988 XD2 = 1934 HB = 1975 VX1 = 1975 WJ1 = 1979 WK7 = 1982 HW1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Oct-27 07:26 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin