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
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 ]  
10694 Lacerda (1981 EH21)
Classification: Outer Main-belt Asteroid          SPK-ID: 2010694
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ hide orbit diagram ]

For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.

[ revert to old Java-based viewer ]

Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03566026911176206 3.8599e-08  
a 3.20895554639226 2.261e-08 au
q 3.094523328040231 1.2253e-07 au
i 22.08220224912414 6.5636e-06 deg
node 177.880011655832 1.1932e-05 deg
peri 128.4220526134596 9.4708e-05 deg
M 170.5984073915612 9.3705e-05 deg
tp 2458005.515191574190
0.00054618 TDB
period 2099.635843675584
n .1714583036312576 1.8121e-09 deg/d
Q 3.32338776474429 2.3416e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1304  
   data-arc span      14208 days (38.90 yr)  
   first obs. used      1981-02-09  
   last obs. used      2020-01-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48902  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-28 22:11:17  

Additional Information
 Earth MOID = 2.11418 au 
 Jupiter MOID = 1.81212 au 
 T_jup = 3.076 
[ 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 13.2   n/a MPO458933  
diameter diameter 11.708 km 0.158 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 7.188 h n/a LCDB (Rev. 2019-August); 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 0.089   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

10694 Lacerda           Discovered 1981 Mar. 2 by S. J. Bus at Siding Spring.
Pedro Lacerda (b. 1975) is a Lecturer at Queen's University Belfast whose work includes analyzing rotational lightcurves to infer physical properties of trans-Neptunian objects and other small solar system bodies.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2017-03-12Last Updated: 2017-04-19

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2020-Feb-20 15:12 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin