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21422 Alexacarey (1998 FL78)
Classification: Main-belt Asteroid          SPK-ID: 2021422
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 44 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04928912360049784 1.428e-08  
a 2.184907588675462 6.0369e-09 au
q 2.077215408481571 3.0427e-08 au
i 3.423894865400338 6.8803e-07 deg
node 105.143374310493 2.3772e-05 deg
peri 160.681172063673 3.9601e-05 deg
M 7.037621347037051 2.5735e-05 deg
tp 2459373.439355966804
(2021-Jun-07.93935597)
8.431e-05 TDB
period 1179.636050672954
3.23
4.889e-06
1.339e-08
d
yr
n .3051788725807664 1.2648e-09 deg/d
Q 2.292599768869352 6.3345e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2111  
   data-arc span      9981 days (27.33 yr)  
   first obs. used      1994-04-05  
   last obs. used      2021-08-02  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50243  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 15:00:01  

Additional Information
 Earth MOID = 1.0615 au 
 Jupiter MOID = 2.72156 au 
 T_jup = 3.674 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.48   n/a MPO636385  
diameter diameter 4.709 km 0.081 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 4.786498 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 sidereal period (not synodic); Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Durech, J.; Hanus, J.; Ali-Lagoa, V. (2018) Astron. Astrophys. 617, A57.]
geometric albedo albedo 0.138   0.027 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21422 Alexacarey           Discovered 1998 Mar. 24 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Alexa A. Carey (b. 1989) was awarded first place in the 2006 Intel International Science and Engineering Fair for her environmental sciences project. She attends the Gold Beach High School, Gold Beach, Oregon, 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

Alternate Designations
 1998 FL78 = 1999 TD96 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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