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 ]  
1491 Balduinus (1938 EJ)
Classification: Outer Main-belt Asteroid          SPK-ID: 2001491
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 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1347457048584179 3.1166e-08  
a 3.24117161793593 1.3881e-08 au
q 2.804437663710055 9.6664e-08 au
i 3.673693538173701 3.8044e-06 deg
node 313.3990034391586 6.5309e-05 deg
peri 156.2464856007785 6.7493e-05 deg
M 150.6782704972011 1.7181e-05 deg
tp 2458108.428645929952
(2017-Dec-20.92864593)
0.00010036 TDB
period 2131.33377762776
5.84
1.3691e-05
3.748e-08
d
yr
n .1689083163692414 1.085e-09 deg/d
Q 3.677905572161806 1.5751e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2621  
   data-arc span      32858 days (89.96 yr)  
   first obs. used      1930-10-16  
   last obs. used      2020-10-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43309  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:18:27  

Additional Information
 Earth MOID = 1.82163 au 
 Jupiter MOID = 1.4391 au 
 T_jup = 3.166 
[ 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 11.4   n/a MPO347528  
diameter diameter 21.941 km 0.213 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 15.315 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Odden, C.E.; Cohen, A.J.; Davis, S.; Eldracher, E.A.; et al. (2018) Minor Planet Bull. 45, 278-279.]
[Loera-Gonzalez, P.; Olguan, L.; Contreras, M.E.; Saucedo M.; et al. (2019) Minor Planet Bull. 46, 283-285.]
geometric albedo albedo 0.048   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

1491 Balduinus (1938 EJ)          Discovered 1938-Feb-23 by Delporte, E. at Uccle
Discovery is clearly Feb. 23. By error the provisional designation 1938 EJ rather than a D designation was assigned.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1938 EJ = 1930 UR = 1959 XJ = 1975 RP1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Jan-28 06:36 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin