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
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 ]  
21400 Ahdout (1998 FM57)
Classification: Main-belt Asteroid          SPK-ID: 2021400
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2002023190318463 3.9023e-08  
a 2.313418723509578 1.0978e-08 au
q 1.850266930171267 9.2433e-08 au
i 3.606005671074874 5.7032e-06 deg
node 350.1544774352241 6.1944e-05 deg
peri 298.3770105078227 6.4835e-05 deg
M 278.5462496513236 2.4767e-05 deg
tp 2458891.295968010228
(2020-Feb-11.79596801)
8.9635e-05 TDB
period 1285.226868444407
3.52
9.1485e-06
2.505e-08
d
yr
n .2801061889063456 1.9939e-09 deg/d
Q 2.776570516847889 1.3176e-08 au
  Orbit Determination Parameters
   # obs. used (total)      999  
   data-arc span      9240 days (25.30 yr)  
   first obs. used      1994-01-12  
   last obs. used      2019-05-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53473  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-12 23:55:23  

Additional Information
 Earth MOID = .836732 au 
 Jupiter MOID = 2.40668 au 
 T_jup = 3.553 
[ 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 15.2   n/a MPO435898  
rotation period rot_per 4.170 h n/a LCDB (Rev. 2019-January); 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.]

21400 Ahdout           Discovered 1998 Mar. 20 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Zimra Payvand Ahdout (b. 1988) was awarded second place in the 2006 Intel International Science and Engineering Fair for her chemistry team project. She attends the Roslyn High School, Roslyn Heights, New York, U.S.A.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20060711/MPCPages.arcLast Updated: 2006-07-17

[ show close-approach data ]
Alternate Designations
 1998 FM57 = 1999 VS78 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin